ASM3P2811A Datasheet, PDF (3/8 Pages) Alliance Semiconductor Corporation – Low Power EMI Reduction IC

September 2003
rev 1.0
ASM3P2811A/B
ASM3P2812A/B
ASM3P2814A/B
Pin Description
Pin# Pin Name
1
XIN
2
VSS
3
D_C
4
SRS
5
ModOUT
6
FRS
7
VDD
8
XOUT
Type
I
P
I
I
O
I
P
Description
Crystal connection or external frequency input. This pin has dual functions.
It can be connected to either an external crystal or an external reference
clock.
Ground to entire chip.
Digital logic input used to select Down (LOW) or Center (HIGH) spread
options. (Refer Output Frequency Deviation and Spread Option Selection
Table). This pin has an internal pull-up resistor.
Spread range select. Digital logic input used to select frequency deviation
(Refer Output Frequency Deviation and Spread Option Selection Table).
This pin has an internal pull-up resistor.
Spread spectrum clock output (Refer Input/Output Frequency Range
Selection Table and Output Frequency Deviation and Spread Option
Selection Table).
Frequency range select. Digital logic input used to select input frequency
range (Refer Input/Output Frequency Deviation and Spread Option
Selection Table). This pin has an internal pull-up resistor.
Power supply for the entire chip (3.3V).
I
Crystal connection. Input connection for an external crystal. If using an
external reference, this pin must be left unconnected.
Input/Output Frequency Range Selection Table
FRS (pin 6)
0
1
Part Number
ASM3P2811 (1X)
Input Output
(MHz) (MHz)
10-20 10-20
ASM3P2812 (2X)
Input
(MHz)
Output
(MHz)
10-20 20-40
ASM3P2814 (4X)
Input
(MHz)
Output
(MHz)
10-20 40-80
Modulation Rate
Input Frequency / 448
20-40 20-40 20-40 40-80 20-40 80-160 Input Frequency / 896
Low Power EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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