SC9257 datasheet(1/28 Pages) SILAN

Part #	SC9257

Description	PLL FOR DTS

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Manufacturer	SILAN [Silan Microelectronics Joint-stock]

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Silan

Semiconductors

SC9257

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

REV: 1.0

2001.10.18

1

PLL FOR DTS

DESCRIPTION

The SC9257 is phase-locked loop (PLL) LSIs for digital tuning

systems (DTS) with built in 2 modulus prescalers.

All functions ate controlled through 3 serial bus lines. These LSIs

are used to configure high-performance digital tuning system.

FEATURES

* Optimal for configuring digital tuning systems in high-fi tuners

and car stereos.

* built-in prescalers. Operate at input frequency ranging from

30~150 MHz during FM

IN input (with 2 modulus prescaler) and

at 0.5~40MHz during AM

IN input (with 2 modulus prescaler or

direct dividing).

* 16 bit programmable counter, dual parallel output phase

comparator, crystal oscillator and reference counter.

* 3.6MHz, 4.5MHz, 7.2MHz or 10.8MHz crystal oscillators can be

used.

* 15 possible reference frequencies. ( When using 4.5MHz crystal)

* Built-in 20 bit general-purpose counter for such uses as

measuring intermediate frequencies (IF

IN1 and IFIN2) and low-

frequency pilot signal cycles (SC

IN).

* High-precision (

±0.55~±7.15µs) PLL phase error detection.

* Numerous general-purpose I/O pins for such uses as peripheral

circuit control.

SOP-20-300-1.27

DIP-20-300-2.54

* 4 N-channel open-drain output ports

(OFF withstanding voltage:12V) for such

uses as control signal output.

* Standby mode function (turns off FM, AM

and

IF

amps)

to

save

current

consumption.

* All functions controlled through 3 serial

bus lines.

* CMOS structure with operating power

supply range of VDD=5.0

±0.5V.

PIN CONFIGURATION

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

18

17

XT

PERIOD

CLOCK

DATA

OT-1

OT-2

OT-3

OT-4

DO2

DO1

I/O-7/SCIN

I/O - 8/IFIN1

GND

FMIN

AMIN

VDD

20

19

I/O - 5/CLK

I/O-6

I/O - 9/IFIN2

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