MAX4546CEE+T [MAXIM]
Audio/Video Switch, 2 Func, 1 Channel, CMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, QSOP-16;
| 型号： | MAX4546CEE+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Audio/Video Switch, 2 Func, 1 Channel, CMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, QSOP-16 开关 |
| 文件： | 总16页 (文件大小：168K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1232; Rev 0; 6/97
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Low 50Ω Insertion Loss: -1dB at 100MHz
♦ High 50Ω Off Isolation: -80dB at 10MHz
♦ Low 50Ω Crosstalk: -80dB at 10MHz
The MAX4545/MAX4546/MAX4547 a re low-volta g e
T-switches designed for switching RF and video signals
from DC to 300MHz in 50Ω a nd 75Ω s ys te ms . The
MAX4545 contains four normally open single-pole/single-
throw (SPST) switches. The MAX4546 contains two dual
SPST switches (one normally open, one normally closed.)
The MAX4547 contains two single-pole/double-throw
(SPDT) switches.
♦ DC to 300MHz -3dB Signal Bandwidth
♦ 20Ω Signal Paths with ±5V Supplies
♦ 1Ω Signal-Path Matching with ±5V Supplies
♦ 0.5Ω Signal-Path Flatness with ±5V Supplies
Each switch is constructed in a “T” configuration, ensuring
excellent high-frequency off isolation and crosstalk of
®
-80dB at 10MHz. They can handle Rail-to-Rail analog sig-
♦ ±2.7V to ±6V Dual Supplies
nals in either direction. On-resistance (20Ω max) is
matched between switches to 1Ω max and is flat (0.5Ω
max) over the specified signal range, using ±5V supplies.
The off leakage current is less than 5nA at +25°C and
50nA at +85°C.
+2.7V to +12V Single Supply
♦ Low Power Consumption: <1µW
♦ Rail-to-Rail Bidirectional Signal Handling
♦ Pin Compatible with Industry-Standard DG540,
These CMOS switches can operate with dual power sup-
plies ranging from ±2.7V to ±6V or a single supply
between +2.7V and +12V. All digital inputs have 0.8V/2.4V
logic thresholds, ensuring both TTL- and CMOS-logic com-
patibility when using ±5V or a single +5V supply.
DG542, DG643
♦ >2kV ESD Protection per Method 3015.7
♦ TTL/CMOS-Compatible Inputs
with Single +5V or ±5V
________________________Ap p lic a t io n s
RF Switching
______________Ord e rin g In fo rm a t io n
Video Signal Routing
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
20 Plastic DIP
20 Wide SO
MAX4545CPP
MAX4545CWP
High-Speed Data Acquisition
Test Equipment
Ordering Information continued at end of data sheet.
ATE Equipment
____N_e_t_w_o_rk_in_g__________P in Co n fig u ra t io n s /Fu n c t io n a l Dia g ra m s /Tru t h Ta b le s
TOP VIEW
IN1
COM1
GND1
N01
1
2
3
4
5
6
7
8
9
20 IN2
MAX4546
MAX4547
19 COM2
18 GND2
17 NO2
16 V+
1
2
3
4
5
6
7
8
16
15
1
2
3
4
5
6
7
8
16
15
IN1
COM1
GND1
N01
IN2
IN1
N01
N02
V+
COM2
V-
14 GND2
13 NO2
12 V+
V-
14 GND2
13 COM2
12 GND3
MAX4545
GND5
N04
15 GND6
14 N03
13 GND3
12 COM3
11 IN3
GND1
COM1
GND4
V+
V-
GND4
COM4
NC4
NC3
V-
11
10 GND3
COM3
11
10 NC2
IN2
GND4
COM4
IN4 10
9
NC1
9
DIP/SO/SSOP
DIP/SO/QSOP
DIP/SO/QSOP
MAX4547
MAX4545
MAX4546
1, 2
LOGIC
SWITCH
LOGIC
3, 4
LOGIC
NO-COM
NC-COM
0
1
OFF
ON
0
1
OFF
ON
ON
OFF
0
1
OFF
ON
ON
OFF
SWITCHES SHOWN
FOR LOGIC “0” INPUT
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND)
16-Pin Narrow SO
V+ ...........................................................................-0.3V, +13.0V
V- ............................................................................-13.0V, +0.3V
V+ to V-...................................................................-0.3V, +13.0V
All Other Pins (Note 1)..........................(V- - 0.3V) to (V+ + 0.3V)
Continuous Current into Any Terminal..............................±25mA
Peak Current into Any Terminal
(derate 8.70mW/°C above +70°C)............................696mW
16-Pin QSOP (derate 8.3mW/°C above +70°C).......... 667mW
20-Pin Plastic DIP (derate 8.0mW/°C above +70°C) ...640mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C) .. 800mW
20-Pin SSOP (derate 8.0mW/°C above +70°C) .......... 640mW
Operating Temperature Ranges
(pulsed at 1ms, 10% duty cycle)..................................±50mA
ESD per Method 3015.7 ..................................................>2000V
MAX454_C_ E .....................................................0°C to +70°C
MAX454_E_ E ..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Continuous Power Dissipation (T = +70°C) (Note 2)
A
16-Pin Plastic DIP
(derate 10.53mW/°C above +70°C)..........................842mW
Note 1: Voltages on all other pins exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum cur-
rent rating.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—Dual Supplies
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, V
= 0.8V, V
= 2.4V, V
= 0V, T = T
to T , unless otherwise noted. Typical
MAX
GND_
INL
INH
A
MIN
values are at T = +25°C.)
A
MIN
TYP
(Note 2)
MAX
PARAMETER
ANALOG SWITCH
SYMBOL
CONDITIONS
T
A
UNITS
V
,
COM_
,V
Analog Signal Range
(Note 3)
C, E
V-
V+
V
Ω
V
NO_ NC_
6/MAX547
+25°C
C, E
14
18
20
25
V+ = 4.5V, V- = -4.5V,
= ±2V, I
Signal-Path On-Resistance
R
ON
V
COM_
= 10mA
= 10mA
COM_
+25°C
C, E
0.5
1
Signal-Path On-Resistance Match
Between Channels (Note 4)
V+ = 4.5V, V- = -4.5V,
= ±2V, I
∆R
Ω
ON
V
COM_
COM_
1.25
Signal-Path On-Resistance
Flatness (Note 5)
V+ = 5V; V- = -5V; V
= 1V,
COM_
R
+25°C
0.3
0.5
Ω
FLAT(ON)
0V, -1V; I
= 10mA
COM
+25°C
C, E
-5
-50
-5
0.02
5
50
5
NO_, NC_ Off Leakage Current
(Note 6)
I
I
,
V+ = 5.5V, V- = -5.5V,
NO_(OFF)
nA
nA
nA
±
±
±
V
COM_
= ±4.5V, V =
N_
4.5V
4.5V
4.5V
NC_(OFF)
+25°C
C, E
0.02
0.04
COM_ Off Leakage Current
(Note 6)
V+ = 5.5V, V- = -5.5V,
= ±4.5V, V
I
COM_(OFF)
V
COM_
=
N_
-50
-10
-100
50
10
100
+25°C
C, E
COM_ On Leakage Current
(Note 6)
V+ = 5.5V, V- = -5.5V,
= ±4.5V, V
I
COM_(ON)
V
COM_
=
N_
LOGIC INPUT
IN_ Input Logic Threshold High
IN_ Input Logic Threshold Low
V
C, E
C, E
1.5
1.5
2.4
1
V
V
IN_H
V
IN_L
0.8
-1
IN_ Input Current Logic High or
Low
I
, I
V
IN_
= 0.8V or 2.4V
C, E
0.03
µA
INH_ INL_
2
_______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, V
= 0.8V, V
= 2.4V, V
= 0V, T = T
to T
, unless otherwise noted. Typical
MAX
GND_
INL
INH
A
MIN
values are at T = +25°C.)
A
MIN
TYP
(Note 2)
MAX
PARAMETER
SYMBOL
CONDITIONS
T
UNITS
A
SWITCH DYNAMIC CHARACTERISTICS
+25°C
C, E
90
35
150
200
100
120
V
= ±3V, V+ = 5V, V- = -5V,
COM_
Turn-On Time
Turn-Off Time
t
ns
ns
ns
ON
Figure 4
+25°C
C, E
V
COM_
= ±3V, V+ = 5V, V- = -5V,
t
OFF
Figure 4
V = ±3V, V+ = 5V, V- = -5V,
COM_
Break-Before-Make Time Delay
(MAX4546/MAX4547 only)
t
+25°C
15
40
60
BBM
Q
Figure 5 (Note 3)
= 1.0nF, V = 0V, RS = 0Ω,
NO_
Charge Injection
(Note 3)
C
L
+25°C
+25°C
150
pC
pF
Figure 6
NO_, NC_ Off Capacitance
C
V
NO_
= GND, f = 1MHz, Figure 8
6
6
N_(OFF)
V
COM_
= 0V,
MAX4545
MAX4546
COM_ Off Capacitance
C
f = 1MHz,
Figure 8
+25°C
+25°C
+25°C
+25°C
pF
pF
dB
dB
COM_(OFF)
6
MAX4545
MAX4546
MAX4547
MAX4545
MAX4546
MAX4547
MAX4545
MAX4546
MAX4547
11.5
11.5
17
V
= V
= 0V,
COM_
NO_
COM_ On Capacitance
Off Isolation (Note 7)
C
COM_(ON)
f = 1MHz, Figure 8
-80
-80
-82
-88
-80
-84
300
R
= 50Ω,
L
V
V
COM_
= 1V
,
ISO
RMS
f = 10MHz, Figure 7
R
= 50Ω, V
=
COM_
L
Channel-to-Channel Crosstalk
(Note 8)
V
1V
Figure 7
, f = 10MHz,
CT
RMS
-3dB Bandwidth
Distortion
BW
Figure 7, R = 50Ω
+25°C
+25°C
MHz
%
L
V
= 5Vp-p, f < 20kHz,
IN
THD+N
0.004
600Ω in and out
POWER SUPPLY
Power-Supply Range
V+, V-
I+
C, E
+25°C
C, E
-6
-1
+6
1
V
0.05
0.05
V+ Supply Current
V - Supply Current
V+ = 5.5V, all V = 0V or V+
IN_
µA
-10
-1
10
1
+25°C
C, E
I-
V- = -5.5V
µA
-10
10
_______________________________________________________________________________________
3
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +4.5V to +5.5V, V- = 0V, V
= 0.8V, V
= 2.4V, V
= 0V, T = T
to T
, unless otherwise noted. Typical values are
MAX
GND_
INL
INH
A
MIN
at T = +25°C.)
A
MIN
TYP
(Note 2)
MAX
PARAMETER
SYMBOL
CONDITIONS
T
A
UNITS
ANALOG SWITCH
V
,
COM_
, V
Analog Signal Range
(Note 3)
V+ = 4.5V, V
+25°C
0
V+
V
Ω
V
NO_ NC_
+25°C
C, E
26
40
60
2
= 3.5V,
= 3.5V,
= 1V,
COM_
COM_
COM_
COM_
Signal-Path On-Resistance
R
ON
I
= 1mA
COM_
+25°C
C, E
Signal-Path On-Resistance
Match
V+ = 4.5V, V
= 1mA
∆R
Ω
ON
I
COM_
4
+25°C
C, E
-5
-50
-5
0.02
0.02
0.04
5
NO_, NC_ Off Leakage Current
(Note 9)
I
I
,
V+ = 5.5V, V
V = 4.5V
N_
NO_(OFF)
nA
nA
nA
NC_(OFF)
50
5
+25°C
C, E
COM_ Off Leakage Current
(Note 9)
V+ = 5.5V, V
= 4.5V
= 1V,
I
COM_(OFF)
V
N_
-50
-10
-100
50
10
100
+25°C
C, E
COM_ On Leakage Current
(Note 9)
I
V+ = 5.5V; V
= 1V, 4.5V
COM_(ON)
COM_
LOGIC INPUT
IN_ Input Logic Threshold High
IN_ Input Logic Threshold Low
V
C, E
C, E
1.5
1.5
2.4
1
V
V
IN_H
V
IN_L
0.8
-1
IN_ Input Current Logic High or
Low
I
, I
V
IN_
= 0.8V or 2.4V
C, E
0.03
µA
INH_ INL_
SWITCH DYNAMIC CHARACTERISTICS
6/MAX547
+25°C
C, E
130
40
250
350
100
150
V
= 3V, V+ = 5V,
COM_
Turn-On Time
Turn-Off Time
t
ns
ns
ON
Figure 4
+25°C
C, E
V
COM_
= 3V, V+ = 5V,
t
OFF
Figure 4
V = 3V, V+ = 5V,
COM_
Break-Before-Make Time Delay
(MAX4546/MAX4547 only)
t
+25°C
+25°C
+25°C
+25°C
20
70
25
ns
BBM
Q
Figure 5 (Note 3)
C
R
= 1.0nF, V = 2.5V,
NO
= 0Ω, Figure 6
L
S
Charge Injection
pC
dB
dB
Off-Isolation
(Note 7)
R
= 50Ω, V
= 1V
RMS
,
,
L
COM_
V
-75
-70
ISO
f = 10MHz, Figure 7
R = 50Ω, V = 1V
L
Channel-to-Channel Crosstalk
(Note 8)
COM_
RMS
V
CT
f = 10MHz, Figure 7
POWER SUPPLY
+25°C
C, E
-1
0.05
1
V+ Supply Current
I+
V+ = 5.5V, all V = 0V or V+
µA
IN_
-10
10
4
_______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +2.7V to +3.6V, V- = 0V, V
= 0.8V, V
= 2.4V, V
= 0V, T = T
to T
, unless otherwise noted. Typical values are
MAX
GND_
INL
INH
A
MIN
at T = +25°C.)
A
MIN
TYP
(Note 2)
MAX
PARAMETER
SYMBOL
CONDITIONS
T
UNITS
A
ANALOG SWITCH
V
,
COM_
, V
Analog Signal Range
(Note 3)
V+ = 2.7V, V
+25°C
0
V+
V
V
NO_ NC_
+25°C
C, E
70
120
150
= 1V,
COM_
Signal-Path On-Resistance
R
Ω
ON
I
= 1mA
COM_
LOGIC INPUT
IN_ Input Logic Threshold High
IN_ Input Logic Threshold Low
V
(Note 3)
(Note 3)
C, E
C, E
1.0
1.0
2.4
1
V
V
IN_H
V
IN_L
0.8
-1
IN_ Input Current Logic High or
Low
I
, I
V
= 0.8V or 2.4V (Note 3)
C, E
µA
INH_ INL_
IN_
SWITCH DYNAMIC CHARACTERISTICS
+25°C
C, E
300
50
600
800
150
200
V
= 1.5V, V+ = 2.7V,
COM_
Turn-On Time
Turn-Off Time
t
ns
ns
ns
ON
Figure 4 (Note 3)
+25°C
C, E
V
COM_
= 1.5V, V+ = 2.7V,
t
OFF
Figure 4 (Note 3)
V = 1.5V, V+ = 2.7V,
COM_
Break-Before-Make Time Delay
(MAX4546/MAX4547 only)
t
+25°C
15
100
BBM
I+
Figure 5 (Note 3)
POWER SUPPLY
+25°C
C, E
-1
0.05
1
V+ Supply Current
V+ = 3.6V, all V = 0V or V+
µA
IN_
-10
10
Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 3: Guaranteed by design.
Note 4: ∆R
= ∆R
- ∆R
.
ON(MIN)
ON
ON(MAX)
Note 5: Resistance flatness is defined as the difference between the maximum and the minimum value of on-resistance as mea-
sured over the specified analog signal range.
Note 6: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 7: Off isolation = 20log [V
/ (V or V )], V
= output, V or V = input to off switch.
COM NC NO
10 COM
NC
NO
Note 8: Between any two switches.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
_______________________________________________________________________________________
5
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V+ = +5V, V- = -5V, T = +25°C, GND = 0V, packages are surface mount, unless otherwise noted.)
A
ON-RESISTANCE vs. V
COM
AND TEMPERATURE
(DUAL SUPPLIES)
ON-RESISTANCE vs. V
COM
ON-RESISTANCE vs. V
COM
(SINGLE SUPPLY)
(DUAL SUPPLIES)
25
23
21
19
17
15
13
11
9
1000
100
10
100
V- = 0V
V+, V- = 1.2V, -1.2V
T = +125°C
A
T = +85°C
A
V+ = 2V
V+, V- = 2V, -2V
V+ = 2.7V
V+ = 3.3V
V+, V- =
2.7V, -2.7V
T = +25°C
A
V+ = 5V
T = 0°C
A
V+ = 7.5V
V+, V- = 3.3V, -3.3V
V+, V- = 5V, -5V
-5 -4 -3 -2 -1
T = -55°C
A
7
V+ = 10V
10
5
10
-5 -4 -3 -2 -1
0
1
2
3
4
5
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
V
COM
(V)
V
COM
(V)
V
COM
(V)
ON-RESISTANCE vs. V
COM
ON/OFF-LEAKAGE CURRENT vs.
TEMPERATURE
AND TEMPERATURE
(SINGLE SUPPLY)
CHARGE INJECTION vs. V
COM
10
1
45
40
35
30
25
20
15
10
120
100
80
T = +125°C
A
T = +85°C
A
ON/OFF LEAKAGE
0.1
DUAL
6/MAX547
60
SUPPLIES
T = +25°C
A
40
0.01
0.001
0.0001
T = 0°C
A
SINGLE
SUPPLY
20
0
T = -55°C
A
-20
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
(V)
-75 -50 -25
0
25 50 75 100 125
-5 -4 -3 -2 -1
V
0
1
2
3
4
5
V
TEMPERATURE (°C)
(V)
COM
COM
ON/OFF TIME vs.
SUPPLY VOLTAGE
ON/OFF TIME vs.
TEMPERATURE
POWER-SUPPLY CURRENT
vs. TEMPERATURE
250
200
150
100
50
110
100
90
80
70
60
50
40
30
20
10
1
t
ON
0.1
0.01
I+
I-
0.001
t
ON
t
OFF
0.0001
0.00001
t
OFF
0
±2
±3
±4
±5
±6
±8
-75 -50 -25
0
25 50 75 100 125
-75 -50 -25
0
25 50 75 100 125
V+, V- (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V+ = +5V, V- = -5V, T = +25°C, GND = 0V, packages are surface mount, unless otherwise noted.)
A
LOGIC-LEVEL THRESHOLD
MAX4545
MAX4546
vs. POSITIVE SUPPLY VOLTAGE
FREQUENCY RESPONSE
FREQUENCY RESPONSE
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
-10
-20
-30
-40
-50
V+ = +5V
V- = -5V
5VΩ INPUT
50Ω OUTPUT
V+ = +5V
V- = -5V
5VΩ INPUT
50 Ω OUTPUT
INSERTION LOSS
INSERTION
LOSS
-60
-70
OFF ISOLATION
OFF ISOLATION
-80
-90
CROSSTALK
CROSSTALK
100
-100
-110
-120
1
10
1000
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V+ (V)
0.1
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4547
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
FREQUENCY RESPONSE
MAX4545 TOC13
100
10
100
V+ = +5V
V- = -5V
5Vp-p SIGNAL
600Ω SOURCE AND LOAD
ON LOSS
0
80
60
40
20
10
1
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
ON PHASE
0.1
0.01
0
-20
-40
-60
-80
-100
OFF ISOLATION
10
0.001
0.0001
CROSSTALK
10
100
1k
10k
100k
1
100
FREQUENCY (MHz)
1000
FREQUENCY (Hz)
_______________________________________________________________________________________
7
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION*
MAX4545
MAX4546
MAX4547
1, 10, 11,
20
1, 16
1, 9
IN_
Digital Control Input
3, 6, 8, 13,
15, 18
RF and Logic Ground. Grounds are not internally connected to each other,
and should all be connected to a ground plane (see Grounding section).
3, 7, 10, 14 4, 6, 12, 14
GND_
V+
16
5
12
5
7, 15
3, 11
Positive Supply-Voltage Input (analog and digital)
Negative Supply-Voltage Input. Connect to ground plane for single-supply
operation.
V-
4, 7, 14, 17
—
4, 13
6, 11
2, 16
8, 10
5, 13
NO_
NC_
Analog Switch Normally Open** Terminals
Analog Switch Normally Closed** Terminals
Analog Switch Common** Terminals
2, 9, 12, 19
2, 8, 9, 15
COM_
*
All pins have ESD diodes to V- and V+.
** NO_ (or NC_) and COM_ pins are identical and interchangeable. Either may be considered as an input or output; signals pass
equally well in either direction.
_______________Th e o ry o f Op e ra t io n
NORMALLY OPEN SWITCH CONSTRUCTION
Lo g ic -Le ve l Tra n s la t o rs
N1
N2
COM_
NO_
D
S
D
S
The MAX4545/MAX4546/MAX4547 are constructed as
high-frequency “T” switches, as shown in Figure 1. The
logic-level input, IN_, is translated by amplifier A1 into a
V+ to V- logic signal that drives amplifier A2. (Amplifier
A2 is a n inve rte r for norma lly c los e d s witc he s .)
Amplifier A2 drives the gates of N-channel MOSFETs
N1 and N2 from V+ to V-, turning them fully on or off.
The same signal drives inverter A3 (which drives the
P-channel MOSFETs P1 and P2) from V+ to V-, turning
them fully on or off, and drives the N-channel MOSFET
N3 off and on.
6/MAX547
IN_ COM_ - NO_
P1
P2
0
1
OFF
ON
S
D
S
D
V+
D
A1
A2
A3
IN_
N3
S
GND_
V-
V+
BSD DIODES
ON GND_, IN_,
COM_, NO_, AND NC_
A1
(NC)
The log ic -le ve l thre s hold is d e te rmine d b y V+ a nd
GND_. The volta g e on GND_ is us ua lly a t g round
potential, but it may be set to any voltage between
(V+ - 2V) and V-. When the voltage between V+ and
GND_ is less than 2V, the level translators become very
slow and unreliable. Since individual switches in each
package have individual GND_ pins, they may be set to
different voltages. Normally, however, they should all
be connected to the ground plane.
V+
Figure 1. T-Switch Construction
(i.e ., s ig na ls ma y p a s s in e ithe r d ire c tion). The off
MOSFET, N3, has no DC conduction, but has a small
a mount of c a p a c ita nc e to GND_. The four on
MOSFETs a ls o ha ve c a p a c ita nc e to g round tha t,
together with the series resistance, forms a lowpass fil-
ter. All of these capacitances are distributed evenly
along the series resistance, so they act as a transmis-
sion line rather than a simple R-C filter. This helps to
explain the exceptional 300MHz bandwidth when the
switches are on.
S w it c h On Co n d it io n
When the switch is on, MOSFETs N1, N2, P1, and P2
are on and MOSFET N3 is off. The signal path is COM_
to NO_, and because both N-channel and P-channel
MOSFETs act as pure resistances, it is symmetrical
8
_______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
Typical attenuation in 50Ω systems is -1dB and is rea-
N-channel and P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase with V+ and V- by the logic-level translators.
sonably flat up to 100MHz. Higher-impedance circuits
s how e ve n lowe r a tte nua tion (a nd vic e ve rs a ), b ut
slightly lower bandwidth due to the increased effect of
the internal and external capacitance and the switch’s
internal resistance.
V+ and GND power the internal logic and logic-level
translators, and set the input logic thresholds. The
log ic -le ve l tra ns la tors c onve rt the log ic le ve ls to
switched V+ and V- signals to drive the gates of the
analog switches. This drive signal is the only connec-
tion between the logic supplies and the analog sup-
plies. All pins have ESD protection to V+ and to V-.
The MAX4545/MAX4546/MAX4547 are optimized for
±5V operation. Using lower supply voltages or a single
supply increases switching time, increases on-resis-
tance (and therefore on-state attenuation), and increas-
es nonlinearity.
Increasing V- has no effect on the logic-level thresh-
olds, but it does increase the drive to the P-channel
switches, reducing their on-resistance. V- also sets the
negative limit of the analog signal voltage.
S w it c h Off Co n d it io n
When the switch is off, MOSFETs N1, N2, P1, and P2
a re off a nd MOSFET N3 is on. The s ig na l p a th is
through the off-capacitances of the series MOSFETs,
but it is shunted to ground by N3. This forms a high-
pass filter whose exact characteristics are dependent
on the source and load impedances. In 50Ω systems,
and below 10MHz, the attenuation can exceed 80dB.
This value decreases with increasing frequency and
increasing circuit impedances. External capacitance
and board layout have a major role in determining over-
all performance.
The logic-level thresholds are CMOS and TTL compati-
ble when V+ is +5V. As V+ is raised, the threshold
increases slightly; when V+ reaches +12V, the level
threshold is about 3.1V, which is above the TTL output
high-level minimum of 2.8V, but still compatible with
CMOS outputs.
Bipolar-Supply Operation
The MAX4545/MAX4546/MAX4547 operate with bipolar
supplies between ±2.7V and ±6V. The V+ and V- sup-
plies need not be symmetrical, but their sum cannot
exceed the absolute maximum rating of 13.0V. Do not
connect the MAX4545/MAX4546/MAX4547 V+ pin to
+3V and connect the logic-level input pins to TTL
logic-level signals. TTL logic-level outputs can
exceed the absolute maximum ratings, causing
damage to the part and/or external circuits.
__________Ap p lic a t io n s In fo rm a t io n
P o w e r-S u p p ly Co n s id e ra t io n s
Overview
The MAX4545/MAX4546/MAX4547 construction is typi-
cal of most CMOS analog switches. It has three supply
pins: V+, V-, and GND. V+ and V- are used to drive the
internal CMOS switches and set the limits of the analog
voltage on any switch. Reverse ESD protection diodes
are internally connected between each analog signal
p in a nd b oth V+ a nd V-. If the volta g e on a ny p in
exceeds V+ or V-, one of these diodes will conduct.
During normal operation these reverse-biased ESD
diodes leak, forming the only current drawn from V-.
CAUTION:
The absolute maximum V+ to V- differential
voltage is 13.0V. Typical “±6-Volt” or “12-Volt”
supplies with ±10% tolerances can be as high
as 13.2V. This voltage can damage the
MAX4545/MAX4546/MAX4547. Even ±5% toler-
ance supplies may have overshoot or noise
spikes that exceed 13.0V.
Virtually all the analog leakage current is through the
ESD diodes. Although the ESD diodes on a given sig-
nal pin are identical, and therefore fairly well balanced,
they are reverse biased differently. Each is biased by
either V+ or V- and the analog signal. This means their
leakages vary as the signal varies. The difference in the
two diode leakages from the signal path to the V+ and
V- pins constitutes the analog signal-path leakage cur-
rent. All analog leakage current flows to the supply ter-
minals, not to the other switch terminal. This explains
how both sides of a given switch can show leakage
currents of either the same or opposite polarity.
Single-Supply Operation
The MAX4545/MAX4546/MAX4547 operate from a sin-
gle supply between +2.7V and +12V when V- is con-
nected to GND. All of the bipolar precautions must be
observed. Note, however, that these parts are opti-
mized for ±5V operation, and most AC and DC charac-
teristics are degraded significantly when departing
from ±5V. As the overall supply voltage (V+ to V-) is
lowered, switching speed, on-resistance, off isolation,
and distortion are degraded. (See Typical Operating
Characteristics.)
The re is no c onne c tion b e twe e n the a na log s ig na l
paths and GND. The analog signal paths consist of an
_______________________________________________________________________________________
9
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
Single-supply operation also limits signal levels and
interferes with grounded signals. When V- = 0V, AC sig-
nals are limited to -0.3V. Voltages below -0.3V can be
clipped by the internal ESD-protection diodes, and the
parts can be damaged if excessive current flows.
GND_ should be separated from 0V only if the logic-
level threshold has to be changed.
Any GND_ p in not c onne c te d to 0V s hould b e
bypassed to the ground plane with a surface-mount
10nF capacitor to maintain good RF grounding. DC
current in the IN_ and GND_ pins is less than 1nA, but
increases with switching frequency.
Power Off
When power to the MAX4545/MAX4546/MAX4547 is off
(i.e., V+ = 0V and V- = 0V), the Absolute Maximum
Ratings still apply. This means that neither logic-level
inputs on IN_ nor signals on COM_, NO_, or NC_ can
exceed ±0.3V. Voltages beyond ±0.3V cause the inter-
nal ESD-protection diodes to conduct, and the parts
can be damaged if excessive current flows.
On the MAX4545 only, two extra ground pins—GND5
a nd GND6—a re p rovid e d to imp rove is ola tion a nd
crosstalk. They are not connected to the logic-level cir-
cuit. These pins should always be connected to the
ground plane with solid copper.
AC Ground and Bypassing
A ground plane is mandatory for satisfactory high-
frequency operation. (Prototyping using hand wiring or
wire-wrap boards is strongly discouraged.) Connect all
0V GND_ pins to the ground plane with solid copper.
(The GND_ pins extend the high-frequency ground
through the package wire-frame, into the silicon itself,
thus improving isolation.) The ground plane should be
solid metal underneath the device, without interruptions.
There should be no traces under the device itself. For
DIP packages, this applies to both sides of a two-sided
board. Failure to observe this will have a minimal effect
on the “on” characteristics of the switch at high frequen-
cies, but it will degrade the off isolation and crosstalk.
Gro u n d in g
DC Ground Considerations
Satisfactory high-frequency operation requires that
careful consideration be given to grounding. For most
applications, a ground plane is strongly recom-
mended, and all GND_ pins should be connected to
it with solid copper. While the V+ and V- power-supply
pins are common to all switches in a given package,
each switch has separate ground pins that are not
internally connected to each other. This contributes to
the overall high-frequency performance and provides
added flexibility in some applications, but it can cause
problems if it is overlooked. All the GND_ pins have
ESD diodes to V+ and V-.
All V+ and V- pins should be bypassed to the ground
plane with surface-mount 10nF capacitors. For DIP
packages, they should be mounted as close as possi-
ble to the pins on the same side of the board as the
device. Do not use feedthroughs or vias for bypass
capacitors. For surface-mount packages, the pins are
s o c los e to e a c h othe r tha t the b yp a s s c a p a c itors
should be mounted on the opposite side of the board
from the device. In this case, use short feedthroughs or
vias, directly under the V+ and V- pins. Any GND_ pin
not connected to 0V should be similarly bypassed. If V-
is 0V, connect it directly to the ground plane with solid
copper. Keep all leads short.
6/MAX547
In systems that have separate digital and analog (sig-
nal) grounds, connect these switch GND_ pins to ana-
log ground. Preserving a good signal ground is much
more imp orta nt tha n p re s e rving a d ig ita l g round .
Ground current is only a few nanoamps.
The logic-level inputs, IN_, have voltage thresholds
determined by V+ and GND_. (V- does not influence
the logic-level threshold.) With +5V and 0V applied to
V+ and GND_, the threshold is about 1.6V, ensuring
compatibility with TTL- and CMOS-logic drivers.
The various GND_ pins can be connected to separate
voltage potentials if any or all of the logic-level inputs is
not a normal logic signal. (The GND_ voltages cannot
exceed (V+ - 2V) or V-.) Elevating GND_ reduces off
isolation. For example, using the MAX4545, if GND2–
GND6 are connected to 0V and GND1 is connected to
V-, then switches 2, 3, and 4 would be TTL/CMOS com-
patible, but switch 1 (IN1) could be driven with the rail-
to-rail output of an op amp operating from V+ and V-.
Note, however, that IN_ can be driven more negative
than GND_, as far as V-. GND_ does not have to be
re move d from 0V whe n IN_ is d rive n from b ip ola r
sources, but the voltage on IN_ should never exceed V-.
The MAX4547 has two V+ and V- pins. Make DC con-
nections to only one of each to minimize crosstalk. Do
not route DC current into one of the V+ or V- pins and
out the other V+ or V- pin to other devices. The second
set of V+ and V- pins is for AC bypassing only.
For dual-supply operation, the MAX4547 should have
four 10nF bypass capacitors connected to each V+
and V- pin, as close to the package as possible. For
single-supply operation, the MAX4547 should have two
10nF bypass capacitors connected (one to each V+
pin), as close to the package as possible.
10 ______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
Bo a rd La yo u t
IC sockets degrade high-frequency performance and
should not be used if signal bandwidth exceeds 5MHz.
V+
V+
82Ω
(194Ω)
10nF
Surfa c e -mount p a rts , ha ving s horte r inte rna l le a d
frames, provide the best high-frequency performance.
Keep all bypass capacitors close to the device, and
separate all signal leads with ground planes. Such
12
LOGIC
IN
1
IN1
IN2
16
grounds tend to be wedge-shaped as they get closer to
the device. Use vias to connect the ground planes on
each side of the board, and place the vias in the apex of
the wedge-shaped grounds that separate signal leads.
Logic-level signal lead placement is not critical.
2
3
COM1
GND1
COM2 15
14
GND2
50Ω
IN/OUT
50Ω
OUT/IN
MAX4546
Im p e d a n c e Ma t c h in g
The typ ic a l on-re s is ta nc e s of the s witc he s in the
MAX4545/MAX4546/MAX4547 are 14Ω, but the off-
state impedances are approximately equal to a 6pF
capacitor. In coaxial systems, therefore, it is impossible
to match any impedance for both the on and off state. If
impedance matching is critical, the MAX4546 is best
suited, since its two sections can be configured as a
single on/off switch, as shown in Figure 2. This circuit
“wastes” switches and has higher losses, but has bet-
ter off isolation and maintains good impedance match-
ing in both the on and off states. The resistance values
shown in Figure 3 are optimized with ±5V supplies for
both 50Ω and 75Ω systems at room temperature.
NO1
NC4
NO2
NC3
4
6
13
11
7
8
10
9
GND3
COM3
GND4
COM4
V-
5
38Ω
(61Ω)
38Ω
(61Ω)
10nF
V-
LOGIC
SWITCH
0
1
OFF
ON
Mu lt ip le x e r
With its excellent off isolation, the MAX4545 is ideal for
us e in hig h-fre q ue nc y vid e o multip le xe rs . Fig ure 3
shows such an application for switching any one of four
video inputs to a single output. The same circuit may
be used as a demultiplexer by simply reversing the sig-
nal direction.
SWITCHES SHOWN FOR LOGIC “0” INPUT
( ) ARE FOR 75 SYSTEMS.
Figure 2. Impedance Matching On/Off Switch
On the MAX4545, GND5 and GND6 should always be
connected to the ground plane with solid copper to
improve isolation and crosstalk.
Stray capacitance of traces and the output capacitance
of switches placed in parallel reduces bandwidth, so the
outputs of no more than four individual switches should
be placed in parallel if high bandwidth is to be main-
tained. If more than four mux channels are needed, the
4-channel circuit should be duplicated and cascaded.
S ig n a l Ro u t in g
Keep all signal leads as short as possible. Separate all
signal leads from each other and other traces with the
ground plane on both sides of the board. Where possi-
ble, use coaxial cable instead of printed circuit board
traces.
______________________________________________________________________________________ 11
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
V+
V+
10nF
GND5
1
2
OUT
1
3
GND6 MAX4545
COM1
2
4
MAX4545
3
4
NO1
GND1
1
2
OUT
50/75Ω
OUT/IN
COM2
GND2
NO2
NO3
NO4
3
4
MAX4545
COM3
GND3
50/75Ω
OUT/IN
ADDRESS
DECODING
COM4
GND4
IN1
IN2
IN3
IN4
IN1
IN2
IN3
IN4
OUT
1
2
5
TO
6
ADDITIONAL
MUXES
MAX4545
3
4
7
6/MAX547
8
V-
10nF
V-
MORE THAN 4 CHANNELS
2 TO 4 CHANNELS
Figure 3. 4-Channel Multiplexer
12 ______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
______________________________________________Te s t Circ u it s /Tim in g Dia g ra m s
+5V
10nF
V+
0V
V+
V
IN_
50%
50%
NO_OR NC_
3V
MAX4545
MAX4546
MAX4547
90%
V
IN_
V
OUT
IN_
COM_
V
OUT
90%
GND_
V-
0V
R = 50Ω
L
t
t
ON
OFF
50Ω
10nF
-5V
ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV).
REPEAT TEST FOR EACH SWITCH.
V- IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION.
Figure 4. Switching Time
10nF +5V
V+
* COM3
* COM2
3V
MAX4546
* N02
* NC3
V
IN_
IN_
V
OUT
t
< 20ns
< 20ns
R
V+
0V
GND_
V-
t
F
50%
V
IN_
R = 50Ω
L
50Ω
10nF
-5V
80%
* REPEAT TEST FOR OTHER PAIR OF SWITCHES.
10nF -+5V
V
OUT
0V
t
BBM
V+
**NC_
**NO_
1V
ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV).
V+ IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION.
MAX4547
V
IN_
IN_
**COM_
V-
V
OUT
GND_
R = 50Ω
L
50Ω
10nF
-5V
** REPEAT TEST FOR OTHER SWITCH.
Figure 5. Break-Before-Make Interval (MAX4546/MAX4547 only)
______________________________________________________________________________________ 13
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
_________________________________Te s t Circ u it s /Tim in g Dia g ra m s (c o n t in u e d )
10nF
+5V
V+
V+
0V
V
IN_
NO_ OR NC_
V
NO
= 0V
MAX4545
MAX4546
MAX4547
V
IN_
V
OUT
∆V
OUT
IN_
COM_
V
OUT
GND_
V-
C = 1000pF
L
50Ω
10nF
∆V IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
OUT
-5V
Q = ∆V x C
OUT
L
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 6. Charge Injection
10nF
+5V
V+
V
V
OUT
6/MAX547
OFF ISOLATION = 20log
ON LOSS = 20log
IN
NETWORK
ANALYZER
V
50Ω
50Ω
OUT
V
IN
0V OR V+
IN_
V
IN
NO_
V
V
OUT
MAX4545
MAX4546
MAX4547
CROSSTALK = 20log
IN
MEAS
REF
V
OUT
COM_
GND_
V-
50Ω
50Ω
-5V
10nF
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT IC TERMINALS.
OFF ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 7. On Loss, Off Isolation, and Crosstalk
14 ______________________________________________________________________________________
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
6/MAX547
Te s t Circ u it s /Tim in g
______________Dia g ra m s (c o n t in u e d )
_________________Ch ip To p o g ra p h ie s
MAX4545
10nF +5V
COM1
IN1 IN2
COM2
GND2
0.101"
(2.565mm)
NO2
N.C.
V+
0V OR V+
IN_
NO_
NC_
GND1
MAX4545
MAX4546
MAX4547
V+
1MHz
CAPACITANCE
ANALYZER
NO1
V-
COM_
GND6
GND_
V-
GND5
NO3
NO4
10nF
GND3
N.C.
-5V
ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (0V).
GND4
COM3
COM4
IN4 IN3
Figure 8. NO_, NC_, COM_ Capacitance
0.085"
(2.159mm)
MAX4546
MAX4547
IN1 IN2
COM1
IN1 IN2
COM2
NO1
V+
GND2
N.C.
GND2
V-
0.101"
0.101"
(2.565mm)
N.C.
GND1
GND1
(2.565mm)
NO2
V+
N.C.
NO1
V-
N.C.
N.C.
N.C.
COM2
N.C.
COM1
NC3
N.C.
N.C.
NC4
N.C.
N.C.
GND3
V-
GND4
GND3
GND4
COM4 COM3
NC2
V+
NC1 IN2
0.085"
0.085"
(2.159mm)
(2.159mm)
N.C. = NO INTERNAL CONNECTION
TRANSISTOR COUNT: 253
SUBSTRATE INTERNALLY CONNECTED TO V-
______________________________________________________________________________________ 15
Qu a d /Du a l, Lo w -Vo lt a g e ,
Bid ire c t io n a l RF/Vid e o S w it c h e s
___________________________________________Ord e rin g In fo rm a t io n (c o n t in u e d )
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 SSOP
PART
TEMP. RANGE
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
MAX4545CAP
MAX4545C/D
MAX4545EPP
MAX4545EWP
MAX4545EAP
MAX4546CPE
MAX4546CSE
MAX4546CEE
MAX4546C/D
MAX4546EPE
MAX4546ESE
MAX4546EEE
MAX4547CPE
MAX4547CSE
MAX4547CEE
MAX4547C/D
MAX4547EPE
MAX4547ESE
MAX4547EEE
Dice*
16 Plastic DIP
16 Narrow SO
16 QSOP
20 Plastic DIP
20 Wide SO
20 SSOP
Dice*
16 Plastic DIP
16 Narrow SO
16 QSOP
16 Plastic DIP
16 Narrow SO
16 QSOP
Dice*
*Contact factory for dice specifications.
16 Plastic DIP
16 Narrow SO
________________________________________________________P a c k a g e In fo rm a t io n
6/MAX547
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 __________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX4546CEE-T
Audio/Video Switch, 2 Func, 1 Channel, CMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, QSOP-16
MAXIM
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