MAX31180AUA+ [MAXIM]
Clock Generator, 134MHz, CMOS, PDSO8, SOP-8;型号: | MAX31180AUA+ |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Clock Generator, 134MHz, CMOS, PDSO8, SOP-8 时钟 光电二极管 外围集成电路 晶体 |
文件: | 总9页 (文件大小:611K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MAX31180
Spread-Spectrum Crystal Multiplier
General Description
Features
The MAX31180 is a low-jitter, crystal-based clock gen-
erator with an integrated phase-locked loop (PLL) to
generate spread-spectrum clock outputs from 16MHz to
134MHz. The device is pin-programmable to select the
clock multiplier rate as well as the dither magnitude. The
MAX31180 has a spread-spectrum disable mode and a
power-down mode to conserve power.
S Generates Spread-Spectrum Clocks from 16MHz
to 134MHz
S Selectable Clock Multiplier Rates of 1x, 2x, and 4x
S Center Spread-Spectrum Dithering
S Selectable Spread-Spectrum Modulation
Magnitudes of ±±0.5, ±10±5, and ±10.5
S Spread-Spectrum Disable Mode
S Low Cycle-to-Cycle Jitter
Applications
Automotive
Cable Modems
Cell Phones
Computer Peripherals
Copiers
S Power-Down Mode with High-Impedance Output
S Low Power Consumption
S 30±V to 306V Single-Supply Operation
S -4±°C to +12.°C Operating Temperature Range
S Small 8-Pin µSOP Package
Infotainment
PCs
Ordering Information appears at end of data sheet.
Printers
Typical Operating Circuit
CRYSTAL
C
C
L2
L1
X1
GND
X2
1
2
3
4
8
7
6
.
V
CC
V
CC
MAX31180
DECOUPLING
CAPACITOR
CMSEL
SMSEL
SSO
PDN
f
SSO
V
CC
NOTE: IN THE ABOVE CONFIGURATION WITH PDN CONNECTED TO V , SMSEL CONNECTED TO GND
CC
AND CMSEL OPEN, THE DEVICE IS IN NORMAL OPERATION WITH 2x CLOCK MULTIPLICATION, AND
SPREAD-SPECTRUM MAGNITUDE OF ±±0.50
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX31180.related
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6524; Rev 1; 3/13
MAX31180
Spread-Spectrum Crystal Multiplier
ABSOLUTE MAXIMUM RATINGS
(Voltages relative to GND.)
Voltage Range on V .........................................-0.3V to +4.3V
Operating Temperature Range........................ -40°C to +125°C
Storage Temperature Range............................ -55°C to +125°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
CC
Voltage Range on Any Pin ...................... -0.3V to (V
+ 0.3V),
CC
not to exceed +4.3V
Continuous Power Dissipation (T = +70°C)
A
μSOP (derate 4.5mW/°C above +70°C)......................362mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
RECOMMENDED OPERATING CONDITIONS
(T = -40NC to +125NC, unless otherwise noted.)
A
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
MIN
3.0
TYP
MAX
UNITS
V
(Note 1)
3.6
V
CC
0.8 x
V
+
CC
0.3
Input Logic 1
Input Logic 0
V
V
V
IH
V
CC
V
GND
0.3
-
0.2 x
V
V
IL
CC
Input Logic Open
Input Leakage
I
0V < V < V
(Note 2)
(Note 3)
Q1
Q80
15
FA
FA
IF
IL
IN
CC
I
0V < V < V
IN
CC
f
< 67MHz
SSO
SSO Load
C
67MHz P f
< 101MHz
10
pF
SSO
SSO
101MHz P f
< 134MHz
7
SSO
Crystal or Clock Input Frequency
Crystal ESR
f
16.0
40
33.4
90
MHz
I
IN
X
ESR
Clock Input Duty Cycle
F
60
%
INDC
Crystal Parallel Load
Capacitance
C
L
(Note 4)
18
pF
Maxim Integrated
2
MAX31180
Spread-Spectrum Crystal Multiplier
DC ELECTRICAL CHARACTERISTICS
(V
= +3.0V to +3.6V, T = -40°C to +125°C, unless otherwise noted.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
= 15pF, f = 16MHz
MIN
TYP
MAX
15
UNITS
mA
FA
FA
V
Supply Current
I
C
SSO
CC1
SSO
Power-Down Current
Output Leakage (SSO)
I
200
+1
PDN = GND, all input pins open
PDN = GND
CCQ
I
-1
OZ
Low-Level Output Voltage (SSO)
High-Level Output Voltage (SSO)
Input Capacitance (X1/X2)
V
OL
I
I
= 4mA
0.4
OL
V
= -4mA
2.4
V
OH
OH
C
(Note 5)
5
pF
IN
AC ELECTRICAL CHARACTERISTICS
(V
= +3.0 to +3.6V, T = -40°C to +125°C, unless otherwise noted.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
Measured at V /2, CMSEL = 0 or open
MIN
40
TYP
MAX
60
UNITS
CC
SSO Duty Cycle
SSODC
%
Measured at V /2, CMSEL = 1
CC
30
70
Rise Time
Fall Time
t
(Note 6)
(Note 6)
1.6
1.6
ns
ns
R
t
F
f
= 16MHz, T = -40 to +85NC,
A
SSO
Peak Cycle-to-Cycle Jitter
t
J
75
ps
10,000 cycles (Note 5)
Power-Up Time
Power-Down Time
Dither Rate
t
t
11
ms
ns
PDN pin (Note 7)
PDN pin (Note 8)
(Note 9)
POR
100
PDN
f
f /992
IN
DITHER
Note 1: All voltages referenced to ground.
Note 2: Maximum source/sink current applied to input to be considered an open. Typical voltage range between 0.4 x V
and
CC
0.55 x V
.
CC
Note 3: Applicable to pins CMSEL, SMSEL, and PDN.
Note 4: See information about C and C in the Applications Information section at the end of the data sheet.
L1
L2
Note .: Not production tested.
Note 6: For 7pF load.
Note 7: Time between PDN deasserted to output active.
Note 8: Time between PDN asserted to output high impedance.
Note 9: Guaranteed by design.
Maxim Integrated
3
MAX31180
Spread-Spectrum Crystal Multiplier
Typical Operating Characteristics
(V
= 3.3V, T = +25°C, unless otherwise noted.)
A
CC
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. FREQUENCY
13
12
11
10
9
13
12
11
10
9
AT 16MHz
CMSEL = 1x
AT 16MHz
CMSEL = 1x
AT 16MHz
CMSEL = 1x
19
17
15
13
11
9
8
8
7
7
3.0
3.2
3.4
-40
10
60
110
16
21
26
31
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY (MHz)
PDN SUPPLY CURRENT
vs. TEMPERATURE
DUTY CYCLE vs. TEMPERATURE
0.06
60
58
56
54
52
50
48
46
44
42
40
AT 16MHz
CMSEL = 1x
AT 16MHz
0.05
0.04
0.03
0.02
0.01
0
-40
10
60
110
-40
10
60
110
TEMPERATURE (°C)
TEMPERATURE (°C)
DUTY CYCLE vs. SUPPLY VOLTAGE
FREQUENCY SPECTRUM AT 133.3MHz
60
58
56
54
52
50
48
46
44
42
40
5
0
-5
NO% DITHE
AT 16MHz
±±1% DITHE
±ꢀ0.1% DITHE
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
±ꢁ1
DITHE
AI%±3303MTz
3.0
3.2
3.4
3.6
129.3
131.3
133.3
135.3
137.3
SUPPLY VOLTAGE (V)
OUTPUT FREQUENCY (MHz)
Maxim Integrated
4
MAX31180
Spread-Spectrum Crystal Multiplier
Pin Configuration
TOP VIEW
+
X1
GND
1
2
3
4
8
7
6
5
X2
MAX31180
V
CC
CMSEL
SMSEL
SSO
PDN
µSOP
Pin Description
PIN
1
NAME
X1
FUNCTION
Crystal Drive/Clock Input. A crystal with the proper loading capacitors is connected across X1 and
X2. Instead of a crystal, a clock can be applied at the X1 input.
2
GND
Signal Ground
Clock Multiplier Select. Tri-level digital input.
0 = 1x
Open = 2x
1 = 4x
3
4
5
CMSEL
SMSEL
Spread-Spectrum Magnitude Select. Tri-level digital input.
0 = Q0.5%
Open = Q1.0%
1 = Q1.5%
Active-Low Power-Down/Spread-Spectrum Disable. Tri-level digital input.
0 = Power-Down/SSO Three-Stated
Open = Power-Up/Spread Spectrum Disabled
1 = Power-Up/Spread Spectrum Enabled
PDN
Spread-Spectrum Clock Multiplier Output. Outputs a 1x, 2x, or 4x spread-spectrum version of the
crystal or clock applied at the X1/X2 pins.
6
7
8
SSO
V
Supply Voltage
CC
Crystal Drive Output. A crystal with the proper loading capacitors is connected across X1 and X2.
If a clock is connected to X1, then X2 should be left open circuit.
X2
Maxim Integrated
5
MAX31180
Spread-Spectrum Crystal Multiplier
Block Diagram
V
CC
V
CC
f
IN
X1
X2
16MHz
TO
33.4MHz
f
= 16MHz
TO
134MHz
SSO
CRYSTAL
OSCILLATOR
1x/2x/4x CLOCK MULTIPLYING
PLL WITH SPREAD SPECTRUM
SSO
f
SSO
C
L2
C
L1
PDN
GND
CMSEL
SMSEL
CONFIGURATION DECODE
AND CONTROL
MAX31180
NOTE: SEE INFORMATION ABOUT C AND C IN THE APPLICATIONS INFORMATION SECTION AT THE END OF THE DATA SHEET.
L1
L2
the spread-spectrum dithering is disabled. The spread-
Detailed Description
spectrum dither rate is fixed at f /992 to keep the dither
IN
rate above the audio frequency range. On power-up, the
output clock (SSO) remains three-stated until the PLL
The MAX31180 is a crystal multiplier with center spread-
spectrum capability. A 16MHz to 33.4MHz crystal is
connected to the X1 and X2 pins. Alternately, a 16MHz
to 33.4MHz clock can be applied to X1 in place of the
crystal. In such applications, X2 would be left open cir-
cuit. Using the CMSEL input, the user selects whether
the attached crystal or input clock is multiplied by 1, 2,
or 4. The MAX31180 is capable of generating spread-
spectrum clocks from 16MHz to 134MHz.
reaches a stable frequency (f
) and dither (f
).
SSO
DITHER
Applications Information
Crystal Selection
The MAX31180 requires a parallel resonating crystal
operating in the fundamental mode, with an ESR of less
than 90Ω. The crystal should be placed very close to the
device to minimize excessive loading due to parasitic
capacitances.
The PLL can dither the output clock about its center
frequency at a user-selectable magnitude. Using the
SMSEL input, the user selects the dither magnitude. The
PDN input can be used to place the device into a low-
power standby mode where the SSO output is three-stat-
ed. If the PDN pin is open, the SSO output is active but
Oscillator Input
When driving the MAX31180 using an external oscillator
clock, consider the input (X1) to be high impedance.
Maxim Integrated
6
MAX31180
Spread-Spectrum Crystal Multiplier
DITHER CYCLE RATE = f = f /992
DITHER IN
+1.5%
+1.0%
+0.5%
f
0
-0.5%
-1.0%
-1.5%
t
Figure 1. Spread-Spectrum Frequency Modulation
Crystal Capacitor Selection
The load capacitors C and C are selected based
on the crystal specifications (from the data sheet of the
crystal used). The crystal parallel load capacitance is
calculated as follows:
Power-Supply Decoupling
To achieve best results, it is highly recommended that
a decoupling capacitor is used on the IC power-sup-
ply pins. Typical values of decoupling capacitors are
0.001μF and 0.1μF. Use a high-quality, ceramic, surface-
mount capacitor, and mount it as close as possible to the
L1
L2
C
× C
+ C
V
CC
and GND pins of the IC to minimize lead inductance.
L1
L2
C
=
+ C
IN
Equation 1
Equation 2
L
C
L1
L2
Layout Considerations
As noted earlier, the crystal should be placed very
close to the device to minimize excessive loading due
to parasitic capacitances. Care should also be taken
to minimize loading on pins that could be open as a
programming option (SMSEL and CMSEL). Coupling on
inputs due to clocks should be minimized.
For the MAX31180 use C = C = C .
LX
L1
L2
In this case, the equation then reduces to:
C
LX
C
=
+ C
IN
L
2
where C = C = C .
LX
L1
L2
Equation 2 is used to calculate the values of C and
L1
C
based on values on C and C
noted in the
L2
L
IN
Recommended Operating Conditions and DC Electrical
Characteristics.
Maxim Integrated
7
MAX31180
Spread-Spectrum Crystal Multiplier
Ordering Information
Package Information
For the latest package outline information and land patterns (foot-
prints), go to www0maximintegrated0com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PART
TEMP RANGE
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
PIN-PACKAGE
8 FSOP
MAX31180AUA+
MAX31180AUA+T
MAX31180AUA/V+
MAX31180AUA/V+T
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
8 FSOP
8 FSOP
8 FSOP
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO0
LAND
PATTERN NO0
8 μSOP
U8+1
21-±±36
9±-±±92
/V denotes an automotive qualified part.
Maxim Integrated
8
MAX31180
Spread-Spectrum Crystal Multiplier
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
12/12
3/13
0
1
Initial release
Added automotive qualified parts to Ordering Information
—
8
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
9
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2013 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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