FS8108 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – Low Power Phase-Locked Loop IC

FS8108 Low Power Phase-Locked Loop IC
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for the use of any circuits shown in this datasheet.
Description
The FS8108 is a serial data input, phase-locked loop IC with programmable input and ref-
erence frequency dividers. When combined with a VCO, the FS8108 becomes the core of
a very low power frequency synthesizer well-suited for mobile communication applica-
tions such as paging systems. The FS8108 includes an 18-bit programmable input fre-
quency divider and also implements a separate pin for stand-by control.
Features
‹ High maximum input operating frequency — 185 MHz at V_DD1 = 1.0 V
‹ Up to 22 MHz internal crystal oscillator reference frequency at V_DD1 = 1.0 V
‹ Extremely low current consumption (I_DD,total typically 0.4 mA at f_FIN = 90 MHz)
‹ 18-bit programmable input frequency divider (including a ÷ 64/65 prescaler) with
divide ratio range from 4032 to 262143
‹ 13-bit programmable reference frequency divider (including a ÷ 8 prescaler) with
divide ratio range from 40 to 65528
‹ Optional lock detector output
‹ Charge pump output for passive low-pass filter
‹ Quick-lock signal output for faster locking
‹ Separate pin for stand-by control
‹ TSSOP 16L package (0.65mm pitch)
Applications
‹ Pager
‹ Wireless communication system
Page 1
Jan 2003