MAX31180AUA+T [MAXIM]
Spread-Spectrum Crystal Multiplier;
| 型号： | MAX31180AUA+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Spread-Spectrum Crystal Multiplier 时钟 光电二极管 外围集成电路 晶体 |
| 文件： | 总9页 (文件大小：538K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX31180
Spread-Spectrum Crystal Multiplier
General Description
Features
The MAX31180 is a low-jitter, crystal-based clock generator
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.
● Generates Spread-Spectrum Clocks from 16MHz to
134MHz
● Selectable Clock Multiplier Rates of 1x, 2x, and 4x
● Center Spread-Spectrum Dithering
● Selectable Spread-Spectrum Modulation Magnitudes
of ±0.5%, ±1.0%, and ±1.5%
● Spread-Spectrum Disable Mode
Applications
● Automotive
● Cable Modems
● Cell Phones
● Computer Peripherals
● Copiers
● Low Cycle-to-Cycle Jitter
● Power-Down Mode with High-Impedance Output
● Low Power Consumption
● 3.0V to 3.6V Single-Supply Operation
● -40°C to +125°C Operating Temperature Range
● Small 8-Pin µSOP Package
● Infotainment
● PCs
● AEC-Q100 Qualified (MAX31180AUA/V+ Only)
● Printers
Ordering Information appears at end of data sheet.
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
19-6524; Rev 3; 2/19
MAX31180
Spread-Spectrum Crystal Multiplier
Absolute Maximum Ratings
(Voltages relative to GND.)
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
Voltage Range on V .........................................-0.3V to +4.3V
CC
Voltage Range on Any Pin ...................... -0.3V to (V
+ 0.3V),
not to exceed +4.3V
CC
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.
Package Information
µSOP-8
PACKAGE CODE
U8+1
Outline Number
21-0036
90-0092
Land Pattern Number
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θ
)
221°C/W
42°C/W
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
206.30/W
42°C/W
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/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.
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.maximintegrated.com/thermal-tutorial.
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MAX31180
Spread-Spectrum Crystal Multiplier
Recommended Operating Conditions
(T = -40NC to +125NC, unless otherwise noted.)
A
PARAMETER
Supply Voltage
SYMBOL
V
CONDITIONS
MIN
3.0
TYP
MAX
UNITS
(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
IN
CC
I
0V < V < V
IN
IL
CC
f
< 67MHz
SSO
SSO Load
C
X
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
ESR
Clock Input Duty Cycle
F
60
%
INDC
Crystal Parallel Load Capacitance
C
(Note 4)
18
pF
L
DC Electrical Characteristics
(V
= +3.0V to +3.6V, T = -40°C to +125°C, unless otherwise noted.)
CC
A
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
I
PDN = GND, all input pins open
PDN = GND
200
+1
CCQ
Output Leakage (SSO)
I
-1
OZ
Low-Level Output Voltage (SSO)
High-Level Output Voltage (SSO)
Input Capacitance (X1/X2)
V
I
I
= 4mA
0.4
OL
OL
V
= -4mA
2.4
V
OH
OH
C
(Note 5)
5
pF
IN
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MAX31180
Spread-Spectrum Crystal Multiplier
AC Electrical Characteristics
(V
= +3.0 to +3.6V, T = -40°C to +125°C, unless otherwise noted.)
CC
A
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
75
ps
J
10,000 cycles (Note 5)
PDN pin (Note 7)
PDN pin (Note 8)
(Note 9)
Power-Up Time
Power-Down Time
Dither Rate
t
t
11
ms
ns
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 5: 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.
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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
13
AT 16MHz
CMSEL = 1x
AT 16MHz
CMSEL = 1x
AT 16MHz
CMSEL = 1x
19
17
15
13
11
9
12
11
10
9
12
11
10
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)
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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
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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
spectrum dither rate is fixed at f /992 to keep the dither
rate above the audio frequency range. On power-up, the
output clock (SSO) remains three-stated until the PLL
Detailed Description
IN
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 circuit.
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 fre-
quency 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-stated.
If the PDN pin is open, the SSO output is active but
the spread-spectrum dithering is disabled. The spread-
Oscillator Input
When driving the MAX31180 using an external oscillator
clock, consider the input (X1) to be high impedance.
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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
Power-Supply Decoupling
The load capacitors C
and C
are selected based
To achieve best results, it is highly recommended that a
decoupling capacitor is used on the IC power-supply pins.
Typical values of decoupling capacitors are 0.001μF and
0.1μF. Use a high-quality, ceramic, surface-mount capaci-
L1
L2
on the crystal specifications (from the data sheet of the
crystal used). The crystal parallel load capacitance is
calculated as follows:
tor, and mount it as close as possible to the V
pins of the IC to minimize lead inductance.
and GND
CC
C
× C
+ C
L1
L2
C
=
+ C
IN
Equation 1
L
C
L1
L2
Layout Considerations
For the MAX31180 use C = C = C .
LX
As noted earlier, the crystal should be placed very close
to the device to minimize excessive loading due to para-
sitic 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.
L1
L2
In this case, the equation then reduces to:
C
2
LX
C
=
+ C
IN
Equation 2
L
where C = C = C .
LX
L1
L2
Equation 2 is used to calculate the values of C
L1
and C based on values on C and C noted in the
L2
L
IN
Recommended Operating Conditions and DC Electrical
Characteristics.
Ordering Information
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
8 FSOP
8 FSOP
8 FSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
/V denotes an automotive qualified part.
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MAX31180
Spread-Spectrum Crystal Multiplier
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
12/12
3/13
0
1
2
Initial release
—
8
Added automotive qualified parts to Ordering Information
Added AEC-Q100 qualification statement to Benefits and Features section
9/17
1
3
2/19
Updated Package Information section
2
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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 and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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