Rainbow Electronics MAX31D80 - Manual (Page 5)

Spread-Spectrum Clock Generators
MAX31C80/MAX31D80
________________________________________________________________________________________ _ 5
Block Diagram
Pin Description
Pin Configuration
1 3 4
10 8 7
X2 V
CC
GND
X1
V
CC
GND
2
9
SMSEL1
+
SMSEL0
EP
5
6
XOUT
CLKOUT
TDFN
TOP VIEW
MAX31C80
MAX31D80
CRYSTAL
OSCILLATOR
PROGRAMMABLE
PLL WITH SPREAD
SPECTRUM
SPREAD-SPECTRUM
MAGNITUDE CONTROL
CLKOUT
(f
CLKOUT
= 2MHz TO 134MHz)
XOUT
(f
XOUT
= f
IN
)
V CC
f IN
GND
V
CC
X1
X2
SMSEL0
SMSEL1
8MHz TO 134MHz CLOCK
OR
8MHz TO 34MHz CRYSTAL
MAX31C80
MAX31D80
PIN NAME FUNCTION
1 X1
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.
2, 9
SMSEL0,
SMSEL1
Spread-Spectrum Magnitude Select.
These are three-state digital inputs
to determine the spread-spectrum
magnitude. Tables 1 and 2 provide
details for configuration of these pins for
down and center dither, respectively.
PIN NAME FUNCTION
3, 8 V CC 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.
10 X2
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.
— EP Exposed Pad. Connect to GND.