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PDF MAX31D80 Data sheet ( Hoja de datos )
| Número de pieza | MAX31D80 | |
| Descripción | Spread-Spectrum Clock Generators | |
| Fabricantes | Maxim Integrated Products | |
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19-5214; Rev 0; 4/10
www.DataSheet4U.com
Spread-Spectrum Clock Generators
General Description
The MAX31C80/MAX31D80 are spread-spectrum clock
generators that contain a phase-locked loop (PLL)
that generates a 2MHz to 134MHz clock from an input
clock or crystal. The PLL can provide a spread-spec-
trum down-dithered (MAX31D80) or center-dithered
(MAX31C80) frequency-modulated clock. The devices
also buffer the incoming clock and provide this output
on a separate pin.
The MAX318C80/MAX31D80 are provided in a 10-pin
TDFN package and operate over a full -40NC to +125NC
automotive temperature range. Devices can be factory
programmed for multiple combinations of input and out-
put frequencies (see the Ordering Information table). A
low-cost, low-frequency crystal can be used at the input
to generate frequencies up to 134MHz.
Typical Application Circuit
fIN = 27MHz
fIN = 27MHz
X1 X2
MAX31D80
VCC XOUT
SMSEL1
CLKOUT
SMSEL0
GND
VCC
VCC
27MHz CLOCK
fCLKOUT = 100MHz
1.5% DOWN DITHERED
DECOUPLING
CAPACITOR
Features
S 2MHz to 134MHz Spread-Spectrum Clock
Generator
S Input Can Be Either an 8MHz to 34MHz Crystal or
8MHz to 134MHz Clock
S Factory-Programmable Output Frequencies in
2MHz to 134MHz Range
S Low-Cost Crystal at Low Frequency Used to
Generate High Frequencies
S On-Board PLL is Capable of Spread-Spectrum
Frequency Modulation
S Down- or Center-Dither Spread-Spectrum
Frequency Modulation
S User-Configurable Spread-Spectrum Dither
Magnitude
S Low Cycle-to-Cycle Jitter
S 3.3V Supply Voltage
S Temperature Range: -40NC to +125NC
S Small Package: 10-Pin TDFN (3mm x 3mm x
0.8mm)
Graphics Cards
Set-Top Boxes
Automotive Infotainment
Printers
Applications
Ordering Information
PART
TEMP RANGE
DITHER MODE
MAX31C80T-xxx+
-40NC to +125NC
Center
MAX31C80T-xxx+T
-40NC to +125NC
Center
MAX31D80T-xxx+
-40NC to +125NC
Down
MAX31D80T-xxx+T
-40NC to +125NC
Down
xxx = Factory-programmable output frequency and dither rate (see the Selector Guide table).
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
PIN-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
Selector Guide appears at end of data sheet.
________________________________________________________________ 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.
1 page  
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Spread-Spectrum Clock Generators
Block Diagram
8MHz TO 134MHz CLOCK
OR
8MHz TO 34MHz CRYSTAL
X1
fIN X2
MAX31C80
MAX31D80
CRYSTAL
OSCILLATOR
PROGRAMMABLE
PLL WITH SPREAD
SPECTRUM
SMSEL0
SMSEL1
SPREAD-SPECTRUM
MAGNITUDE CONTROL
VCC
VCC
CLKOUT
(fCLKOUT = 2MHz TO 134MHz)
XOUT
(fXOUT = fIN)
GND
TOP VIEW
10 9 8 7 6
Pin Configuration
MAX31C80
MAX31D80
EP
12345
TDFN
PIN NAME
FUNCTION
Crystal Drive/Clock Input. A crystal with
the proper loading is connected across
1
X1
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.
Spread-Spectrum Magnitude Select.
These are three-state digital inputs
2, 9
SMSEL0,
SMSEL1
to determine the spread-spectrum
magnitude. Tables 1 and 2 provide
details for configuration of these pins for
down and center dither, respectively.
Pin Description
PIN NAME
FUNCTION
3, 8 VCC Supply Voltage
4, 7 GND Ground
5
CLKOUT
Clock Output. Spread-spectrum-capable
digital output clock from the PLL.
6
XOUT
Crystal Buffered Output. Buffered digital
output of the input crystal or clock.
Crystal Drive Output. A crystal with the
10
X2
proper loading is connected across X1
and X2. If a clock is applied at the X1
input, then X2 should be left open circuit.
— EP Exposed Pad. Connect to GND.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX31D80.PDF ] | |
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