MAX31C80T-UGQ+T [MAXIM]
Clock Generator, CMOS, PDSO10;
| 型号： | MAX31C80T-UGQ+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Clock Generator, CMOS, PDSO10 光电二极管 |
| 文件： | 总9页 (文件大小：786K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
f
= 27MHz
IN
f
IN
= 27MHz
X1
X2
MAX31D80
XOUT
27MHz CLOCK
= 100MHz
V
CC
CLKOUT
f
CLKOUT
SMSEL1
1.5% DOWN DITHERED
V
CC
SMSEL0
GND
V
CC
DECOUPLING
CAPACITOR
PART
TEMP RANGE
DITHER MODE
Center
PIN-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
MAX31C80T-xxx+
MAX31C80T-xxx+T
MAX31D80T-xxx+
MAX31D80T-xxx+T
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
Center
Down
Down
Spread-Spectrum Clock Generators
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
Relative to GND..............-0.3V to +4.3V
Storage Temperature Range............................ -55NC to +135NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
CC
Voltage Range on Any Other Pin
Relative to GND ....................................-0.3V to (V
+ 0.3V)*
CC
Continuous Power Dissipation (T = +70°C)
A
10-Pin TDFN (derate 24.4mW/°C above +70°C).....1951.2mW
*Not to exceed +4.3V.
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.
RECOMMENDED OPERATING CONDITIONS
(T = -40NC to +125NC.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
3.6
UNITS
Supply Voltage
V
CC
3.0
3.3
V
Input Logic 0
(SMSEL0 and SMSEL1)
0.25 x
V
CC
V
-0.3
V
V
V
V
IL
Input Logic 1
(SMSEL0 and SMSEL1)
0.75 x
V
CC
V
CC
0.3
+
V
IH
Input Logic Unconnected
(SMSEL0 and SMSEL1)
Limits are in case user wants to force
voltage instead of unconnecting this pin
0.4 x
0.55 x
V
CC
V
IF
V
CC
0.3 x
Input Logic 0 for X1
V
-0.3
IL:X1
IH:X1
V
CC
0.7 x
V
CC
0.3
+
Input Logic 1 for X1
XOUT Load
V
V
V
CC
C
15
15
10
7
pF
L:XOUT
2MHz Pf
< 67MHz
CLKOUT
CLKOUT Load
C
67MHz Pf
< 101MHz
pF
L:CLKOUT
CLKOUT
101MHz Pf
P134MHz
CLKOUT
Crystal Frequency
Clock Input Frequency
Crystal ESR
f
f
8
8
34
MHz
MHz
I
IN
134
90
IN
X
ESR
Clock Input Duty Cycle
f
40
60
%
INDC
Crystal Parallel Load
Capacitance
C
CL
18
pF
2
______________________________________________________________________________________
Spread-Spectrum Clock Generators
DC ELECTRICAL CHARACTERISTICS
(3.0V P V
P 3.6V, T = -40NC to +125NC, unless otherwise noted.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
= 27MHz, f = 100MHz, down
dithered, C = 10pF
L
MIN
TYP
MAX
UNITS
f
IN
CLKOUT
Supply Current
I
22
mA
DD
Input Leakage
(SMSEL0 and SMSEL1)
I
SMSEL_ = GND or V
Q15
FA
V
IL
CC
Low-Level Output Voltage
(XOUT and CLKOUT)
V
I
I
= 10mA
= -10mA
0.2
OL
OH
OL
High-Level Output Voltage
(XOUT and CLKOUT)
V
CC
0.2
-
V
V
OH
Input Capacitance
(X1 and X2)
C
IN
5
pF
AC ELECTRICAL CHARACTERISTICS
(3.0V P V
P 3.6V, T = -40NC to +125NC, unless otherwise noted.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
= 7pF
L:CLKOUT
MIN
TYP
MAX
UNITS
CLKOUT Duty Cycle
f
C
C
V
40
60
CLKOUT:DC
%
= 7pF, T = +25NC,
L:XOUT
A
XOUT Duty Cycle
f
40
60
XOUT:DC
= 3.3V
CC
Rise Time
t
C
C
= 7pF
= 7pF
1.6
1.6
ns
ns
R
L:CLKOUT
Fall Time
t
F
L:CLKOUT
Dither Rate Range
Dither Rate Accuracy
f
Factory programmable
20
-4
40
+4
kHz
%
DR
CLKOUT = 100MHz, 10,000 cycles,
Peak Cycle-to-Cycle Jitter
Power-Up Time
t
75
1
ps
J
T
= +25NC
A
V
V
valid to output active, T = +25NC,
= 3.3V
CC
A
t
ms
PUP
CC
_______________________________________________________________________________________
3
Spread-Spectrum Clock Generators
Typical Operating Characteristics
(V
CC
= +3.3V, T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. OUTPUT FREQUENCY
27
25
20
15
10
5
f
f
= 27MHz
f
f
= 27MHz
V
= 3.3V
IN
CLKOUT
IN
CLKOUT
CC
29
27
25
23
21
19
17
15
= 100MHz
= 100MHz
V
= 3.6V
CC
25
23
21
19
17
15
T = +125°C
A
T = +25°C
A
T = -40°C
A
V
= 3.3V
CC
V
= 3.0V
CC
0
3.0
3.2
3.4
3.6
-40
-15
10
35
60
85
110
8
32
56
80
104
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT FREQUENCY (MHz)
DUTY CYCLE
vs. SUPPLY VOLTAGE
DUTY CYCLE
vs. TEMPERATURE
60
58
56
54
52
50
48
46
44
42
40
60
58
56
54
52
50
48
46
44
42
40
f
= 100MHz
f
= 100MHz
CLKOUT
CLKOUT
T
A
= +125°C
V
= 3.6V
CC
T
A
= +25°C
V
= 3.3V
CC
V
= 3.0V
T
A
= -40°C
CC
3.0
3.2
3.4
3.6
-40
10
60
110
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY SPECTRUM AT 122MHz
WITH CENTER SPREAD
FREQUENCY SPECTRUM AT 100MHz
WITH DOWN DITHER
0
-10
-20
-30
-40
-50
-60
0
-10
-20
-30
-40
-50
-60
f
= 122MHz
f
= 100MHz
CLKOUT
CENTER DITHER = 1.5ꢀ
CLKOUT
CENTER DITHER = -3%
-14.23dB
-16.56dB
119.2
121.2
123.2
96
98
FREQUENCY (MHz)
100
FREQUENCY (MHz)
4
______________________________________________________________________________________
V
CC
8MHz TO 134MHz CLOCK
OR
8MHz TO 34MHz CRYSTAL
MAX31C80
MAX31D80
V
CC
X1
X2
PROGRAMMABLE
PLL WITH SPREAD
SPECTRUM
CRYSTAL
OSCILLATOR
CLKOUT
(f
f
IN
= 2MHz TO 134MHz)
CLKOUT
XOUT
(f
= f
)
XOUT IN
GND
SMSEL0
SMSEL1
SPREAD-SPECTRUM
MAGNITUDE CONTROL
Pin Configuration
TOP VIEW
10
9
8
7
6
MAX31C80
MAX31D80
EP
1
2
3
4
5
TDFN
Pin Description
PIN
NAME
FUNCTION
PIN
3, 8
4, 7
NAME
FUNCTION
V
CC
Supply Voltage
Ground
Crystal Drive/Clock Input. A crystal with
the proper loading is connected across
X1 and X2. Instead of a crystal, a clock
can be applied at the X1 input. If no
clock or crystal is present, then no clock
is output at either XOUT or CLKOUT.
GND
Clock Output. Spread-spectrum-capable
digital output clock from the PLL.
1
X1
5
6
CLKOUT
Crystal Buffered Output. Buffered digital
output of the input crystal or clock.
XOUT
Spread-Spectrum Magnitude Select.
These are three-state digital inputs
SMSEL0, to determine the spread-spectrum
SMSEL1 magnitude. Tables 1 and 2 provide
details for configuration of these pins for
down and center dither, respectively.
Crystal Drive Output. A crystal with the
proper loading is connected across X1
and X2. If a clock is applied at the X1
input, then X2 should be left open circuit.
10
—
X2
EP
2, 9
Exposed Pad. Connect to GND.
Spread-Spectrum Clock Generators
buffer the incoming clock and provide this output on a
separate pin.
Detailed Description
The MAX31C80/MAX31D80 modulate an input clock to
generate a center-dithered or down-dithered spread-
spectrum output. An 8MHz to 27MHz crystal or 8MHz
to 134MHz oscillator input is applied to the device. An
internal PLL dithers the output clock at a user-select-
able magnitude to produce a down-dithered or center-
dithered output clock. The output clock’s frequency is
programmable from 2MHz to 134MHz. The devices also
Spread-Spectrum Dither Magnitude
The MAX31D80 can generate down-dithered magnitudes
up to -3%. The MAX31C80 can generate center-dithered
magnitudes up to P 1.5%. The desired magnitude is
selected using the input pins SMSEL1 and SMSEL0 as
shown in Tables 1 and 2. A power cycle is required after
each change of the dither magnitude for the changes to
take effect.
Table 1. Spread-Spectrum Mode and Magnitude Select (for Down Dither)
SPREAD-SPECTRUM MAGNITUDE
SELECTED (%)
SPREAD-SPECTRUM DITHER MODE
SMSEL1
SMSEL0
SELECTED
0
0
Spread-Spectrum Disabled
0
Unconnected
0 to -0.25
0 to -0.375
0 to -0.5
0 to -0.75
0 to -1.0
0 to -1.5
0 to -2.0
0 to -3.0
0
1
Unconnected
0
Unconnected
Unconnected
Down Dither
Unconnected
1
1
1
1
0
Unconnected
1
Table 2. Spread-Spectrum Mode and Magnitude Select (for Center Dither)
SPREAD-SPECTRUM MAGNITUDE
SELECTED (%)
SPREAD-SPECTRUM DITHER MODE
SMSEL1
SMSEL0
SELECTED
0
0
Spread-Spectrum Disabled
0
Unconnected
-0.25 to +0.25
-0.375 to +0.375
-0.5 to +0.5
-0.75 to +0.75
-1.0 to +1.0
-1.5 to +1.5
N/A
0
1
Unconnected
0
Unconnected
Unconnected
Center Dither
Unconnected
1
1
1
1
0
Unconnected
1
N/A
6
______________________________________________________________________________________
Spread-Spectrum Clock Generators
DOWN DITHERED (MAX31D80)
FREQUENCY
IF SMSEL0 = SMSEL1 = 0
f
CLKOUT
DITHER AMOUNT
(-0.25% TO -3.0%)
f
- (0.25% TO 3%)
CLKOUT
1
DITHER CYCLE
RATE
TIME
Figure 1. Spread-Spectrum Frequency Modulation (Down Dithered)
CENTER DITHERED (MAX31C80)
FREQUENCY
IF SMSEL0 = SMSEL1 = 0
f
+ (0.25% TO 1.5%)
CLKOUT
DITHER AMOUNT
( 0.25% TO 1.5%)
f
IN
f
- (0.25% TO 1.5%)
CLKOUT
1
DITHER CYCLE
RATE
TIME
Figure 2. Spread-Spectrum Frequency Modulation (Center Dithered)
_______________________________________________________________________________________
7
Spread-Spectrum Clock Generators
Factory Programmability
The MAX31C80/MAX31D80 can provide a variety of fre-
quencies, which are available to users by ordering the
device according to specifications listed in the Selector
Guide table.
V
CC
V
VALID
CC
t
PUP
Email the factory at custom.oscillators@maxim-ic.com
to obtain custom output frequencies for specific input
frequencies not mentioned in the Selector Guide table.
OUTPUT VALID
OUTPUT VALID
XOUT
Applications Information
Power-Supply Decoupling
To achieve best results, it is highly recommended that a
decoupling capacitor be used on the IC power-supply
pins. Typical values of decoupling capacitors are 0.01FF
and 0.1FF. Use a high-quality, ceramic, surface-mount
CLKOUT
capacitor and mount it as close as possible to the V
pins of the IC to minimize lead inductance.
CC
Figure 3. Power-Up Timing
Selector Guide
INPUT FREQUENCY
(MHz)
OUTPUT
FREQUENCY (MHz)
DITHER RATE
(kHz)
PART
DITHER TYPE
MAX31C80T-UGQ+
MAX31C80T-002+
MAX31D80T-UGQ+
MAX31D80T-003+
27
25
27
12
100
63.05
100
31.25
32.05
31.25
25
Center
Center
Down
Down
12
+Denotes a lead(Pb)-free/RoHS-compliant package.
Package Information
For the latest package outline information and land patterns,
go to www.maxim-ic.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 TYPE PACKAGE CODE DOCUMENT NO.
10 TDFN-EP
T1033+1
21-0137
8
______________________________________________________________________________________
Spread-Spectrum Clock Generators
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
4/10
Initial release
—
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
9
©
2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
相关型号：
MAX31D80T-002+T
Clock Generator, 134MHz, CMOS, PDSO10, 3 X 3 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, TDFN-10
MAXIM
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