PLL FREQUENCY SYNTHESIZER FOR PAGER

S5T8809

1

INTRODUCTION

S5T8809 is a superior low-power-programmable PLL frequency

synthesizer which can be used in high performance / Simple

application for a Wide Area Pager system.

S5T8809 consists of 2 kinds of divider block including a 19-bit Shift

register, 16/18-bit Latch, 13/15bits R-counter and 16/18-bit N-

Counter, 32/33 Prescaler, and a phase detector block including a

Phase detector, Lock detector and a Charge pump.

S5T8809 also has a battery saving mode which can control each

register block by serial control data from the

µ-controller (MICOM)

and it also has boost up signal output for fast locking.

FEATURES

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On-chip reference oscillator supports external crystal which oscillates up to 23MHz

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Superior supply current:

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Excellent Divider range:

— Ref. Divider:

FRC (0): 1 / 40 to 1 / 65528 (Multiple): Default

FRC (1): 1 / 5 to 1 / 32767

— Rx Divider:

PBC (0): 1 / 1056 ~ 1 / 65535: Default

PBC (1): 1 / 1056 ~ 1 / 262143

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Boost-up signal output for Fast Locking

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In the Standby mode, VDD1 block can be controlled by BSB Pin status

— Standby current consumption: 10

µA (Max.)

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Programmable control the output of LD to reduce internal noise

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Programmable 17 / 19-bit shift register value controlled by PBC

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Charge pump output circuitry for passive filter

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Package type: 16

−TSSOP (0.65mm)

ORDERING INFORMATION

+: New Product

Device

Package

Operating Temperature

+S5T8809X01-R0B0

16

−TSSOP−0044

−25°C to +75°C

16-TSSOP-0044

( Magnification = 1 : 4 )