SC9256S 데이터 시트보기 (PDF) - Silan Microelectronics

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SC9256S

PLL FOR DTS

Silan Microelectronics 

Silan

Semiconductors

SC9256

• Direct dividing mode (12 bits)

Address D0H

LSB

P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15

20

211

Don't care

MSB

Divisor setting range (direct dividing mode):n=10H~FFFH(16~4095)

With the direct dividing mode, data p0~p3 are don’t-care and bit p4 is the LSB.

2. Prescaler and programmable counter circuit configuration

(1) Pulse swallow mode circuit configuration

PSC

P0-P3

FMIN

AMIN

1/2 FMH

FML

HF

FM,MODE

2 modulus

prescaler

Prescaler section

4bit swallow counter

Preset

12bit programmable counter

P4-P15

To phase

comparator

Fig.3

This circuit consists of a 2 modulus prescaler, a 4 bit swallow counter and a 12bit programmable counter.

During FMIN(FMIN mode),a 1/2 prescaler is added to the preceding step.

(2) Direct dividing method circuit configuration

Amp

Preset

AMIN

12bit program counter

To phase comparator

P4-P15

Fig.4

With the direct dividing mode, the prescaler section is bypassed and the 12bit programmable counter is used.

(3) Both FMIN and AMIN have built-in amps. Data are input by capacitor coupling. FMIN and AMIN operate at

low amplitude.

General-purpose counter

The general-purpose counter is a 20bit counter. It has such uses as counting AM/FM band intermediate

frequencies (IF) and detecting auto-stop signals during auto-search tuning. General-purpose counter pins can also

be used as I/O ports.

1. General-purpose counter control bits

(1) Bits G0 and G1 … Used for selecting the general-purpose counter gate time.

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

REV: 1.0

11

2002.01.30.

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