MAX14802CCM+ [MAXIM]
Low-Charge Injection, 16-Channel, High-Voltage Analog Switches; 低电荷注入， 16通道，高压模拟开关
| 型号： | MAX14802CCM+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Charge Injection, 16-Channel, High-Voltage Analog Switches |
| 文件： | 总18页 (文件大小：221K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4484; Rev 1; 9/09
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
General Description
Features
♦ Integrated Overvoltage Protection (MAX14802/
The MAX14800–MAX14803 provide high-voltage
switching on 16 channels for ultrasonic imaging and
printer applications. The devices utilize HVCMOS
process technology to provide 16 high-voltage low-
charge-injection SPST switches, controlled by a digital
interface. Data is clocked into an internal 16-bit shift
register and retained by a programmable latch with
enable and clear inputs. A power-on reset function
ensures that all switches are open on power-up.
MAX14803)
♦ 20MHz Serial Interface (5V)
♦ HVCMOS Technology for High Performance
♦ Individually Programmable High-Voltage Analog
Switches
The MAX14800–MAX14803 operate with a wide range
♦ Very Low 5µA (typ) Quiescent Current
of high-voltage supplies including: V /V
= +100V/
PP NN
-100V, +200V/0V, and +40V/-160V. The digital interface
operates from a separate +2.7V to +5.5V V supply.
♦ DC-to-20MHz Low-Voltage Analog Signal
DD
Frequency Range
Digital inputs DIN, CLK, LE, and CLR operate on the
supply voltage.
V
DD
♦ 2.7V to 5.5V Logic Supply Voltage
The MAX14801/MAX14803 provide integrated 35kΩ
bleed resistors on each switch terminal to discharge
capacitive loads. The MAX14802/MAX14803 provide
integrated clamping diodes for overvoltage protection
against positive overshoot.
♦ Low-Charge Injection, Low-Capacitance R
L
Switches
♦ -77dB (typ) Off-Isolation at 5MHz (R = 50Ω)
L
The MAX14800–MAX14803 are available in the
48-pin TQFP package. All devices are specified for the
commercial 0°C to +70°C temperature range.
♦ Daisy-Chainable Serial Interface
♦ Flexible High-Voltage Supplies (V - V
= 250V)
PP
NN
Applications
Ultrasound Imaging
Printers
Pin Configuration appears at end of data sheet.
Ordering Information/Selector Guide
SWITCH
CHANNELS
BLEED
RESISTOR
SECOND
SOURCE
PART
OVP
PIN-PACKAGE
TEMP RANGE
MAX14800CCM+*
MAX14801CCM+*
MAX14802CCM+
MAX14803CCM+
16
16
16
16
No
Yes
No
No
No
HV2601
HV2701
—
48 TQFP
48 TQFP
48 TQFP
48 TQFP
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Yes
Yes
Yes
—
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
Parts with extended temperature range (-40°C to +85°C) are available upon request.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Peak Analog Signal Current Per Channel................................3A
V
V
V
V
Logic-Supply Voltage .......................................-0.3V to +7V
Continuous Power Dissipation (T = +70°C)
DD
PP
PP
NN
A
- V
Supply Voltage ....................................................260V
48-Pin TQFP (derate 22.7mW/°C above +70°C).........1818mW
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
NN
Positive-Supply Voltage.................................-0.3V to +220V
Negative-Supply Voltage...............................-0.3V to -220V
48-Pin TQFP..................................................................44°C/W
Junction-to-Case Thermal Resistance (θJC) (Note 1)
Logic Inputs (LE, CLR, CLK, DIN, DOUT)................-0.3V to +7V
COM_, NO_
48-Pin TQFP..................................................................10°C/W
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature..................................................... +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(MAX14800/MAX14801) ...........(-0.3V + V ) to (V
+ 220V)
NN
NN
COM_, NO_
(MAX14802/MAX14803).........(-0.3V + V ) to the minimum of
NN
[(V
+ 220V) or (V + 0.3V)]
NN
PP
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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
(V
= +2.7V to +5.5V, V = +40V to V
+ 250V, V
= -40V to -160V, T = T
A
to T
, unless otherwise noted. Typical values
MAX
DD
PP
NN
NN
MIN
are at T = +25°C.) (Note 2)
A
–MAX14803
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLIES
V
Supply Voltage
V
+2.7
+40
-160
+5.5
V
V
DD
DD
V
+
NN
V
Supply Voltage
V
+100
-100
PP
PP
250
V
V
Supply Voltage
V
0
V
NN
DD
NN
Supply Quiescent
I
5
µA
DDQ
Current
V
Supply Dynamic
DD
I
V
= +5V, LE = +5V, f = 5MHz
CLK
0.5
10
mA
µA
DD
DD
Current
V
Supply Quiescent
PP
I
All switches remain on or off, I
= 5mA
COM_
0
PPQ
Current
V
V
V
= +40V, V
= -160V, f
= 50kHz
= 50kHz
COM_
4
6
8
PP
PP
PP
NN
COM_
V
Supply Dynamic
PP
I
mA
µA
Current (All Channel
Switching Simultaneously)
= +100V, V
= +160V, V
= -100V, f
3.4
0
PP
NN
= -40V, f
= 50kHz
NN
COM_
V
Supply Quiescent
NN
I
All switches remain on or off, I
= 5mA
COM_
10
NNQ
Current
V
V
V
= +40V, V
= -160V, f
= 50kHz
= 50kHz
COM_
5
4
3
PP
PP
PP
NN
COM_
V
Supply Dynamic
NN
I
mA
Current (All Channel
Switching Simultaneously)
= +100V, V
= +160V, V
= -100V, f
2.3
NN
NN
= -40V, f
= 50kHz
NN
COM_
ANALOG SWITCH
min of (V
NN
COM_, NO_ Analog Signal
Range
V
V
,
COM_
+ 200V)
or (V
(Note 3)
V
V
NN
-
PP
NO_
10V)
2
_______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.7V to +5.5V, V = +40V to V
+ 250V, V
= -40V to -160V, T = T
A
to T
, unless otherwise noted. Typical values
MAX
DD
PP
NN
NN
MIN
are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
26
MAX
48
UNITS
I
I
I
I
I
I
= 5mA
COM_
COM_
COM_
COM_
COM_
COM_
V
V
= +40V, V
= -160V,
PP
NN
= 0
COM_
= 200mA
= 5mA
22
32
22
30
Small-Signal Switch
On-Resistance
V
V
= +100V, V = -100V,
PP NN
R
Ω
ONS
= 0
COM_
= 200mA
= 5mA
18
27
20
30
V
V
= +160V, V = -40V,
NN
PP
= 0
COM_
= 200mA
= 0,
16
27
Small-Signal Switch
On-Resistance Matching
V
= +100V, V
= -100V, V
NN COM_
PP
ΔR
5
15
40
0
%
Ω
ONS
I
= 5mA
COM_
Large-Signal Switch
On-Resistance
R
V
= V - 10V, I
= 1A
COM_
ONL
COM_
PP
NO_ or COM_ to GND
(MAX14801/MAX14803), switch off
Shunt Resistance
R
INT
30
50
kΩ
I
COM_(OFF),
Switch-Off Leakage
Switch-Off DC Offset
V
, V
= +100V or unconnected
2
µA
mV
A
COM_ NO_
I
NO_(OFF)
R = 100kΩ
-30
+30
L
Switch-Output Peak
Current (Note 4)
100ns pulse width, 0.1% duty cycle
3
Switch-Output COM_
Isolation Diode Current
(Note 4)
300ns pulse width, 2% duty cycle
(MAX14802/MAX14803)
500
mA
SWITCH DYNAMIC CHARACTERISTICS
V
V
= +100V, R = 10kΩ,
L
= -100V
NO_
Turn-On Time
Turn-Off Time
t
2
2
3.5
3.5
50
µs
µs
ON
NN
V
V
= +100V, R = 10kΩ,
L
= -100V
NO_
t
OFF
NN
Output Switching
Frequency
f
Duty cycle = 50%
(Note 4)
kHz
V/ns
SW
Maximum V
Slew Rate
, V
COM_ NO_
dV/dt
20
f = 5MHz, R = 1kΩ, C = 15pF
-50
-77
-80
L
L
Off-Isolation
Crosstalk
V
dB
dB
pF
ISO
f = 5MHz, R = 50Ω
L
V
f = 5MHz, R = 50Ω
L
CT
C
COM_(OFF),
COM_, NO_ Off-
Capacitance (Note 4)
V
V
= 0, V
= 0, f = 1MHz
4
11
36
18
56
COM_
COM_
NO_
C
NO_(OFF)
COM_ On-Capacitance
(Note 4)
C
= 0, f = 1MHz
20
pF
mV
COM_(ON)
Output-Voltage Spike
(Note 4)
V
f
R = 50Ω
L
-150
+150
SPK
Small-Signal Analog
Bandwidth
V
= +100V, V
= -100V, C = 200pF
20
MHz
BW
PP
NN
L
_______________________________________________________________________________________
3
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.7V to +5.5V, V = +40V to V
+ 250V, V
= -40V to -160V, T = T
A
to T
, unless otherwise noted. Typical values
MAX
DD
PP
NN
NN
MIN
are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
820
600
350
MAX
UNITS
V
V
V
= +40V, V
= -160V, V
= 0
COM_
PP
PP
PP
NN
Charge Injection
Q
pC
= +100V, V
= +160V, V
= -100V, V
= 0
COM_
NN
NN
= -40V, V
= 0
COM_
LOGIC LEVELS
Logic-Input Low Voltage
V
0.75
0.4
V
V
V
V
IL
V
0.75
-
DD
Logic-Input High Voltage
Logic-Output Low Voltage
Logic-Output High Voltage
V
IH
V
I
I
= 1mA
SINK
OL
OH
V
0.5
-
DD
V
= 0.75mA
SOURCE
Logic-Input Capacitance
(Note 4)
C
10
+1
pF
µA
IN
Logic-Input Leakage
I
IN
-1
–MAX14803
TIMING CHARACTERISTICS
(V
= +2.7V to +5.5V, V = +40V to V
+ 200V, V
= -40V to -160V, T = T
A
to T
, unless otherwise noted. Typical values
MAX
DD
PP
NN
NN
MIN
are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC TIMING (Figure 1)
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
= +5V 10%
= +3V 10%
20
10
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
CLK Frequency
f
MHz
ns
CLK
10
16
3
DIN to CLK Setup Time
DIN to CLK Hold Time
CLK to LE Setup Time
LE Low-Pulse Width
CLR High-Pulse Width
CLK Rise and Fall Times
CLK to DOUT Delay
t
DS
t
ns
DH
3
36
65
14
22
20
40
t
ns
CS
WL
WC
t
ns
t
ns
50
50
42
80
t , t
R
ns
F
6
t
ns
DO
12
Note 2: All devices are 100% tested at T = +70°C. Limits over the operating temperature range are guaranteed by design and
A
characterization.
Note 3: The analog signal input V
and V
must satisfy V
≤ (V
, V
) ≤ V , or remain unconnected during power-up
COM_
NO_
NN
COM_ NO_ PP
and power-down.
Note 4: Guaranteed by characterization; not production tested.
_______________________________________________________________________________________
4
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
Test Circuits
V
PP
- 10V
R
L
100kΩ
I
SOL
NO_
NO_
NO_
V
V
OUT
+100V
-100V
OUT
COM_
COM_
COM_
R
L
100kΩ
MAX14800–
MAX14803
MAX14800–
MAX14803
MAX14800–
MAX14803
+100V
+100V
V
PP
V
PP
V
DD
5V
V
V
PP
V
DD
5V
V
PP
V
PP
V
DD
5V
PP
V
V
NN
GND
V
NN
V
GND
V
V
GND
NN
NN
NN
NN
-100V
-100V
DC OFFSET ON/OFF
t /t TEST CIRCUIT
ON OFF
SWITCH OFF LEAKAGE
V
= 10V
V
= 10V
P-P
OUT
P-P
OUT
AT 5MHz
AT 5MHz
V
PP
COM_
NO_
COM_
NO_
COM_
NO_
V
OUT
50Ω
V
I
OUT
ID
COM_
V
NN
NO_
R
L
50Ω
MAX14800–
MAX14803
MAX14800–
MAX14803
MAX14800–
MAX14803
V
NN
V
V
V
V
V
5V
V
V
V
V
V
DD
5V
PP
PP
DD
PP
PP
V
V
PP
V
V
V
5V
PP
DD
GND
GND
NN
NN
NN
NN
GND
NN
NN
V
V
V
OUT
V
IN
OUT
ISOLATION DIODE CURRENT
V
ISO
= 20LOG
V
CT
= 20LOG
IN
OFF ISOLATION
CROSSTALK
+V
SPK
V
OUT
V
OUT
NO_
NO_
V
OUT
-V
SPK
100pF
50Ω
COM_
COM_
R
L
1kΩ
V
COM_
MAX14800–
MAX14803
MAX14800–
MAX14803
V
V
V
V
V
V
V
V
V
V
V
DD
5V
PP
PP
DD
DD
PP
PP
GND
GND
NN
NN
NN
NN
Q = 1000pF x V
OUT
OUTPUT-VOLTAGE SPIKE
CHARGE INJECTION
_______________________________________________________________________________________
5
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
Typical Operating Characteristics
(V
DD
= +3V, V = +100V, V
= -100V, T = +25°C, unless otherwise noted.)
NN A
PP
ON-RESISTANCE vs.
ANALOG SIGNAL VOLTAGE
ON-RESISTANCE vs.
ANALOG SIGNAL VOLTAGE
TURN-ON/TURN-OFF TIME vs.
ANALOG SIGNAL VOLTAGE
180
160
140
120
100
80
5
4
3
2
1
0
V
= +100V, V = -100V
NN
PP
160
140
120
100
80
V
= +160V, V = -40V
NN
PP
V
= +100V, V = -100V
NN
PP
t
OFF
V
= +40V, V = -160V
NN
PP
60
T
A
= +25°C
60
T
= +70°C
A
40
40
20
20
T
= 0°C
t
ON
A
0
0
-150 -100
-50
0
50
100
150
-100
-50
0
50
100
-90
-60
-30
0
30
60
90
V
(V)
V
COM
(Ω)
V
(V)
NO
COM
LOGIC SUPPLY CURRENT vs.
SUPPLY VOLTAGE
–MAX14803
OFF-ISOLATION vs. FREQUENCY
LEAKAGE CURRENT vs. TEMPERATURE
0
-20
-40
-60
-80
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
I
(V
= +90V)
COM_(ON) COM
I
(V
= -90V)
COM_(ON) COM
I
(V
= 0)
COM_(ON) COM
T
= +70°C
A
I
(V
= -90V)
COM_(OFF) COM
T
A
= +25°C
I
(V
= 0)
T
= +70°C
COM_(OFF) COM
A
T
A
= +25°C
I
(V
= +90V)
COM_(OFF) COM
T
A
= 0°C
T
A
= 0°C
0.001
0.01
0.1
1
10
100
0
10
20
30
40
50
60
70
2.7
3.1 3.5 3.9
4.3 4.7 5.1 5.5
FREQUENCY (MHz)
TEMPERATURE (°C)
V
DD
SUPPLY VOLTAGE (V)
HIGH-VOLTAGE SUPPLY CURRENT vs.
TEMPERATURE
LOGIC SUPPLY CURRENT vs.
SERIAL-CLOCK FREQUENCY
HIGH-VOLTAGE SUPPLY CURRENT vs.
SWITCHING FREQUENCY
250
200
150
100
50
0.20
0.15
0.10
0.05
0
8
6
4
2
0
V
V
= +100V
= -100V
ALL SWITCHES SWITCHING
PP
NN
T
A
= +70°C
T
A
= +25°C
T
A
= +25°C
I
PP
T
A
= 0°C
I
PP
I
NN
I
NN
0
0
2
4
6
8
10
0
10
20
30
40
50
60
70
0
10
20
30
40
50
CLK SERIAL-CLOCK FREQUENCY (MHz)
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
6
_______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
Pin Description
PIN
NAME
FUNCTION
1, 2, 14, 16,
24, 35, 36
N.C.
No Connection. Not internally connected.
3
COM4
NO4
Analog Switch 4—Common Terminal
Analog Switch 4—Normally Open Terminal
Analog Switch 3—Normally Open Terminal
Analog Switch 3—Common Terminal
Analog Switch 2—Normally Open Terminal
Analog Switch 2—Common Terminal
Analog Switch 1—Common Terminal
Analog Switch 1—Normally Open Terminal
Analog Switch 0—Normally Open Terminal
Analog Switch 0—Common Terminal
4
5
NO3
6
COM3
NO2
7
8
COM2
COM1
NO1
9
10
11
12
13
15
17
18
19
20
21
22
23
25
26
27
28
29
30
31
32
33
34
37
NO0
COM0
V
Negative High-Voltage Supply. Bypass V to GND with a 0.1µF or greater ceramic capacitor.
NN
NN
V
Positive High-Voltage Supply. Bypass V to GND with a 0.1µF or greater ceramic capacitor.
PP
PP
GND
Ground
V
Digital Supply Voltage. Bypass V
Serial-Data Input
to GND with a 0.1µF or greater ceramic capacitor.
DD
DD
DIN
CLK
LE
Serial-Clock Input
Active-Low, Latch-Enable Input
Latch Clear Input
CLR
DOUT
Serial-Data Output
COM15 Analog Switch 15—Common Terminal
NO15
NO14
Analog Switch 15—Normally Open Terminal
Analog Switch 14—Normally Open Terminal
COM14 Analog Switch 14—Common Terminal
COM13 Analog Switch 13—Common Terminal
NO13
Analog Switch 13—Normally Open Terminal
COM12 Analog Switch 12—Common Terminal
NO12
NO11
Analog Switch 12—Normally Open Terminal
Analog Switch 11—Normally Open Terminal
COM11 Analog Switch 11—Common Terminal
COM10 Analog Switch 10—Common Terminal
_______________________________________________________________________________________
7
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
Pin Description (continued)
PIN
38
39
40
41
42
43
44
45
46
47
48
NAME
NO10
COM9
NO9
FUNCTION
Analog Switch 10—Normally Open Terminal
Analog Switch 9—Common Terminal
Analog Switch 9—Normally Open Terminal
Analog Switch 8—Common Terminal
Analog Switch 8—Normally Open Terminal
Analog Switch 7—Normally Open Terminal
Analog Switch 7—Common Terminal
Analog Switch 6—Normally Open Terminal
Analog Switch 6—Common Terminal
Analog Switch 5—Normally Open Terminal
Analog Switch 5—Common Terminal
COM8
NO8
NO7
COM7
NO6
COM6
NO5
COM5
–MAX14803
D
N
D
N-1
DIN
LE
D
50%
50%
N+1
50%
50%
t
WL
t
CS
50%
50%
CLK
t
t
DH
DS
t
DO
50%
t
DOUT
t
OFF
ON
OFF
ON
90%
SWITCH
CLR
10%
50%
50%
t
WC
Figure 1. Serial Interface Timing
8
_______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
Bleed Resistors (MAX14801/MAX14803)
Detailed Description
The MAX14801/MAX14803 feature integrated 35kΩ
bleed resistors to discharge capacitive loads such as
piezoelectric transducers. Each analog switch terminal
is connected to GND with a bleed resistor.
The MAX14800–MAX14803 provide high-voltage
switching on 16 channels for ultrasound imaging and
printer applications. The devices utilize HVCMOS
process technology to provide 16 high-voltage low-
charge-injection SPST switches, controlled by a digital
interface. Data is clocked into an internal 16-bit shift
register and retained by a programmable latch with
enable and clear inputs. A power-on-reset function
ensures that all switches are open on power-up.
Overvoltage Protection
(MAX14802/MAX14803)
The MAX14802/MAX14803 feature clamping diodes (at
the COM_). These clamping diodes provide overvolt-
age protection against positive overshoot.
The MAX14800–MAX14803 operate with a wide range
Serial Interface
The MAX14800–MAX14803 are controlled by a serial
interface with a 16-bit serial shift register and transpar-
ent latch. Each of the sixteen data bits controls a single
analog switch (see Table 1). Data on DIN is clocked
with the most significant bit (MSB) first into the shift reg-
ister on the rising edge of CLK. Data is clocked out of
the shift register onto DOUT on the rising edge of CLK.
DOUT reflects the status of DIN, delayed by 16 clock
cycles (see Figures 1 and 2).
of high-voltage supplies including: V /V
= +100V/
PP NN
-100V, +200V/0V, or +40V/-160V. The digital interface
operates from a separate +2.7V to +5.5V V supply.
DD
Digital inputs DIN, CLK, LE, and CLR operate on the
supply voltage. The MAX14801/MAX14803
V
DD
provide integrated 35kΩ bleed resistors on each switch
terminal to discharge capacitive loads. The MAX14802/
MAX14803 provide integrated clamping diodes for
overvoltage protection against positive overshoot. The
MAX14802/MAX14803 feature clamping diodes (at the
COM_). These clamping diodes provide overvoltage
protection against positive overshoot.
Latch Enable (LE)
Drive LE logic-low to change the contents of the latch
and update the state of the high-voltage switches
(Figure 2). Drive LE logic-high to freeze the contents of
the latch and prevent changes to the switch states. To
reduce noise due to clock feedthrough, drive LE logic-
high while data is clocked into the shift register. After
the data shift register is loaded with valid data, pulse
LE logic-low to load the contents of the shift register
into the latch.
Analog Switch
The MAX14800–MAX14803 allow a peak-to-peak analog
signal range from V
to the minimum of either V
+
NN
NN
200V or (V
- 10V). Analog switch inputs must be
PP
unconnected, or satisfy V
ing power-up and power-down.
≤ (V
, V
) ≤ V dur-
NN
COM_ NO_ PP
High-Voltage Supplies
The MAX14800–MAX14803 allow a wide range of high-
Latch Clear (CLR)
The MAX14800–MAX14803 feature a latch clear input.
Drive CLR logic-high to reset the contents of the latch
to zero and open all switches. CLR does not affect the
contents of the data shift register. Pulse LE logic-low to
reload the contents of the shift register into the latch.
voltage supplies. The devices operate with V
from
NN
-160V to 0 and V from +40V to V
+ 250V. When
PP
NN
V
is connected to GND (single-supply applications),
NN
the devices operate with V
up to +200V. The V
PP
PP
and V
high-voltage supplies are not required to be
NN
symmetrical, but the voltage difference (V
must not exceed 250V.
- V
)
NN
PP
Power-On Reset
The MAX14800–MAX14803 feature a power-on-reset
circuit to ensure all switches are open at power-on. The
internal 16-bit serial shift register and latch are set to
zero on power-up.
_______________________________________________________________________________________
9
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
LE
CLK
DIN
D15
D14
D14
D13
D13
D1
D1
D0
LSB
MSB
D15
D15
D0
DOUT
DATA FROM PREVIOUS DATA BYTE
POWER-UP DEFAULT: D15–D0 = 0
–MAX14803
Figure 2. Latch Enable Interface Timing
Table 1. Serial Interface Programming (Notes 5–10)
CONTROL
DATA BITS
BITS
FUNCTION
D0
(LSB)
D1 D2 D3
D4
D5
D6
D7
LE CLR SW0 SW1 SW2
SW3 SW4
SW5
SW6
SW7
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
OFF
ON
H
L
H
L
OFF
ON
OFF
ON
H
L
OFF
ON
H
L
OFF
ON
H
L
OFF
ON
H
L
OFF
ON
H
L
H
X
X
OFF
ON
X
X
X
X
X
X
X
X
X
X
X
X
X
X
HOLD PREVIOUS STATE
OFF OFF OFF
OFF OFF
OFF
OFF
OFF
10 ______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
Table 1. Serial Interface Programming (Notes 5–10) (continued)
CONTROL
BITS
DATA BITS
FUNCTION
D15
(MSB)
D8
D9 D10 D11 D12 D13 D14
LE CLR SW8 SW9 SW10 SW11 SW12 SW13 SW14 SW15
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
OFF
ON
H
L
H
L
OFF
ON
OFF
ON
H
L
H
OFF
ON
L
H
OFF
ON
L
H
OFF
ON
L
OFF
ON
H
L
H
X
X
OFF
ON
X
X
X
X
X
X
X
X
X
X
X
X
X
X
HOLD PREVIOUS STATE
OFF OFF OFF
OFF OFF
OFF
OFF
OFF
X = Don’t care.
Note 5: The 16 switches operate independently.
Note 6: Serial data is clocked in on the rising edge of CLK.
Note 7: The switches go to a state retaining their present condition on the rising edge of LE. When LE is low, the shift register data
flows through the latch.
Note 8: DOUT is high when switch 15 is on.
Note 9: Shift register clocking has no effect on the switch states if LE is high.
Note 10: The CLR input overrides all other inputs.
______________________________________________________________________________________ 11
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
and CLR inputs of all devices, and drive LE logic-low to
Applications Information
update all devices simultaneously. Drive CLR high to
open all the switches simultaneously. Additional shift
registers can be included anywhere in series with the
MAX14800–MAX14803 data chain.
For medical ultrasound applications, see Figures 4, 5,
and 6.
Logic Levels
The MAX14800–MAX14803 digital interface inputs CLK,
Supply Sequencing and Bypassing
DIN, LE, and CLR operate on the V
supply voltage.
DD
The MAX14800–MAX14803 do not require special
sequencing of the V , V , and V
supply voltages;
NN
DD PP
Daisy-Chaining Multiple Devices
Digital output DOUT is provided to allow the connection
of multiple MAX14800–MAX14803 devices by daisy-
chaining (Figure 3). Connect each DOUT to the DIN of
the subsequent device in the chain. Connect CLK, LE,
however, analog switch inputs must be unconnected,
or satisfy V ≤ (V , V ) ≤ V during power-up
NN
COM_ NO_
PP
and power-down. Bypass V , V , and V
to GND
NN
DD PP
with a 0.1µF ceramic capacitor as close as possible to
the device.
Application Diagrams
U11
U10
U1n
DIN1
DOUT
DOUT
DOUT
DIN
DIN
DIN
–MAX14803
MAX14800–
MAX14803
MAX14800–
MAX14803
MAX14800–
MAX14803
CLK
LE
CLK
LE
CLK
LE
CLK
LE
CLR
CLR
CLR
CLR
U21
U20
U2n
DOUT
DOUT
DOUT
DIN
DIN
DIN
DIN2
MAX14800–
MAX14803
MAX14800–
MAX14803
MAX14800–
MAX14803
CLK
LE
CLK
LE
CLK
LE
CLR
CLR
CLR
Figure 3. Interfacing Multiple Devices by Daisy-Chaining
12 ______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
PROBES
MAINFRAME
HIGH-VOLTAGE TRANSMIT
1 PER CHANNEL
PROBE SELECTION
2 TO 4 PROBES
CABLE
1 PER CHANNEL
TRANSDUCERS
2 TO 4 PER CHANNEL
1 TO 2A MAX
100V MAX
RELAY
1 RELAY/CH/PROBE
PROBE
A
HV ANALOG
SWITCHES
2 TO 4 PER CHANNEL
PROBE
B
+V
10mA TYP
LOW-VOLTAGE RECEIVE
64 TO 128 CHANNELS
PROBE
C
1V MAX
HIGH-
VOLTAGE
ISOLATION
PROBE
D
-V
Figure 4. Medical Ultrasound Application—High-Voltage Analog Switches in Probe
______________________________________________________________________________________ 13
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
PROBES
MAINFRAME
HV TRANSMIT
1 PER CHANNEL
PROBE SELECTION
2 TO 4 PROBES
HV ANALOG
SWITCHES
CABLE
2 TO 4 PER CHANNEL
TRANSDUCERS
2 TO 4 PER CHANNEL
2 TO 4 PER CHANNEL
100V MAX
1 TO 2A MAX
+V
PROBE
A
RELAYS
2 TO 4 RELAYS/CH/PROBE
10mA TYP
LV RECEIVE
64 TO 128 CHANNELS
1V MAX
HIGH-
VOLTAGE
ISOLATION
PROBE
B
–MAX14803
-V
PROBE
C
PROBE
D
Figure 5. Medical Ultrasound Application—High-Voltage Analog Switches in Mainframe
14 ______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
PROBES
MAINFRAME
HIGH-VOLTAGE TRANSMIT
2 TO 4 PER CHANNEL
PROBE SELECTION
2 TO 4 PROBES
CABLE
2 TO 4 PER CHANNEL
TRANSDUCERS
2 TO 4 PER CHANNEL
1 TO 2A MAX
100V MAX
RELAYS
PROBE
2 TO 4 RELAYS/CH/PROBE
A
+V
-V
LOW-VOLTAGE RECEIVE
64 TO 128 CHANNELS
10mA TYP
1V MAX
PROBE
B
+V
-V
+V
-V
+V
-V
PROBE
C
+V
-V
+V
-V
PROBE
D
+V
-V
+V
-V
HIGH-VOLTAGE
ISOLATION AND
CHANNEL SELECT
2 TO 4 PER CHANNEL
Figure 6. Medical Ultrasound Application—Multiple Transmit and Isolation per Receiver Channel
______________________________________________________________________________________ 15
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
Functional Diagram
V
DD
V
PP
CLR
V
PP
**
COM0
NO0
*
*
LEVEL
SHIFTER
LATCH
V
NN
DIN
V
V
NN
16-BIT
SHIFT
REGISTER
MAX14802
MAX14803
CLK
PP
8
**
COM15
NO15
DOUT
*
*
LEVEL
SHIFTER
LATCH
V
NN
V
NN
LE
GND
V
NN
*BLEED RESISTORS AVAILABLE ON THE MAX14803 ONLY.
**OVERVOLTAGE PROTECTION DIODES ARE AVAILABLE ON THE MAX14802 AND MAX14803 ONLY.
16 ______________________________________________________________________________________
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
–MAX14803
Pin Configuration
TOP VIEW
35 34 33 32 31 30 29 28 27
36
26
25
N.C.
DOUT
CLR
LE
COM10
NO10
24
23
22
21
20
19
18
17
16
15
14
13
37
38
39
COM9
NO9 40
CLK
DIN
COM8 41
MAX14800–
MAX14803
NO8
NO7
42
43
V
DD
GND
N.C.
COM7 44
NO6 45
V
COM6
NO5
46
47
48
PP
N.C.
V
NN
COM5
+
2
3
4
5
6
7
8
9
10
1
11
12
TQFP
7mm x 7mm
Chip Information
Package Information
For the latest package outline information and land patterns, go
PROCESS: BiCMOS
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
48 TQFP
C48-6
21-0054
______________________________________________________________________________________ 17
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
Revision History
REVISION REVISION
DESCRIPTION
PAGES
CHANGED
NUMBER
DATE
0
4/09
Initial release.
—
Corrected two specifications in the Absolute Maximum Ratings section.
1
9/09
Changed the minimum of the peak-to-peak analog signal range to “either V + 200V
2, 9
NN
or (V – 10V).”
PP
–MAX14803
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.
18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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