October 2003
P2811/12/14
rev
Pin Configuration
Pin Description
Pin#
1
2
Pin Name
Type
Description
XIN
I
Connect to externally generated clock signal or crystal.
VSS
D_C
P
I
Ground Connection. Connect to system ground.
Digital logic input used to select Down (LOW) or Center (HIGH) Spread
Options (see Output Frequency Deviation and Spread Option Selections).
This pin has an internal pull-up resistor.
Spread Range Selection. Digital logic input used to select frequency
deviation (see Output Frequency Deviation and Spread Option Selections).
This pin has an internal pull-up resistor.
Spread Spectrum clock output (see Input/Output Frequency Range
Selections and Output Frequency Deviation and Spread Option Selections).
Frequency Range Selection. Digital logic input used to select input fre-
quency range (see Input/Output Frequency Range Selections). This pin has
an internal pull-up resistor.
3
SRS
I
4
5
6
ModOut
FRS
O
I
VDD
P
I
Connect to +3.3 V
7
8
XOUT
Connect to crystal. No connect if externally generated clock signal is used.
Input/Output Frequency Range Selections
Part number
P2812 (2X)
Pin 6
Modulation
rate
P2811 (1X)
P2814 (4X)
Input
Output
(MHz)
Input
Output
Input
Output
(MHz)
FRS
(MHz)
(MHz)
(MHz)
(MHz)
Input frequency
/ 448
Input frequency
/ 896
0
1
10-20
10-20
10-20
20-40
10-20
40-80
20-40
20-40
20-40
40-80
20-40
80-160
Low Power EMI Reduction IC
2 of 8
Notice: The information in this document is subject to change without notice.
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
