FS8308 Datasheet, PDF (1/15 Pages) List of Unclassifed Manufacturers – Low Power PLL Frequency Synthesizer IC

FS8308 Low Power PLL Frequency Synthesizer IC
Advance Information
Princeton Technology Corp. reserves the right to change the product described in this datasheet. All information con-
tained in this datasheet is subject to change without prior notice. Princeton Technology Corp. assumes no responsibility
for the use of any circuits shown in this datasheet.
Description
The FS8308 is a serial data input, phase-locked loop IC with programmable input and ref-
erence frequency dividers. When combined with a VCO, this IC becomes the core of a
very low power frequency synthesizer well-suited for mobile communication applications,
e.x. paging systems and family radio service (FRS). There are some features implemented
in this IC, including an 18-bit programmable input frequency divider, a terminal for refer-
ence oscillator buffer output, as well as stand-by control through programming, and etc.
Details are listed in the following.
Features
‹ Up to 40 MHz external crystal oscillator reference frequency under normal condition
‹ Low current consumption (I_DD,total typically 1.2 mA at f_FIN = 500 MHz and V_DD1 = 1.0
V)
‹ With Schmitt trigger added for noise-immune programming input
‹ 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 (LD, f_R/2, f_V/2)
‹ Charge pump output for passive low-pass filter
‹ Wide tuning range of charge pump output for external VCO (V_SS+0.5 to V_DD2-0.5)
‹ Switchover terminal for constant of loop filter or general open drain output
‹ Reference oscillator buffer output
‹ Programmable stand-by control
‹ TSSOP 16L package (0.65mm pitch)
Applications
‹ Pager
‹ Family radio service (FRS)
‹ Wireless communication system
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April 2003