U6239B

TELEFUNKEN Semiconductors

Rev. A3, 28-May-97

1 (15)

2.9 GHz PLL for SAT TV Tuner with UNi-Bus

Description

The U6239B is a single-chip frequency synthesizer with

bus control, developed for SAT TV-tuner and cable tuner

applications.

This IC contains an integrated preamplifier, a high

frequency prescaler, a reference divider with multiple

programmable divider ratios, a crystal oscillator, a phase/

frequency detector together with a charge pump, a tuning

amplifier and an analog-to-digital converter.

Features

D 2.9 GHz divide-by-16 prescaler integrated

D UNi-BUS:

3-wire bus software compatible to LC7215 (Sanyo)

4 bidirectional ports (open collector)

2 unidirectional ports (open collector)

5 level ADC or unidirectional port (open collector)

Address mode select function (AMS, Pin 3):

3 or 4 addresses selectable via Pin 10

D 3-wire bus mode:

4 unidirectional ports (open collector)

Lock output (open collector)

D Programmable reference divider

D Low power consumption (typ. 5 V / 23 mA)

D Electrostatic protection according to MIL-STD 883

Block Diagram

ADC

AS / ENABLE / P3

5

10

5–bit Latch

11

9

8

P7

P6 / ADC

P5

7

6

P4

I/O

Ports

7–bit Latch

T1

8–bit Latch

7–bit Latch

SCL

SDA 4

12

Vs

OS

T0

5I

2

3

Oscillator

XTAL

divide by 256/512/off/1024

Phase

detector

Charge

pump

16 VD

1PD

GND 15

Control

UNI–BUS

FP

FR

15/14–bit

Power–on

reset

POR

P0/Lock

RD1,2,3

RDS / AMS

RFi

14

13

div. by 16

Prescaler

divide by 25/50/140/250

divide by 50/100/280/500

AMS

RDS

14–bit Shift Reg.

Sync

LOCK

15–bit Latch

SET

Sync

9611809

counter

Figure 1.