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U4476B

IF Amplifier / Converter for DVB (Cable)

Description

The U4476B is a bipolar circuit for the processing of

DVB-Cable IF signals (Digital

Video Broadcasting).

The

amplifier/ converter is suitable for QAM modulated IF

signals (1st IF) and provides the gain controlled 2nd IF.

With 5 V supply voltage the IC allows application in

RF/IF front ends for DVB-Cable receivers (set top boxes).

Features

D

Gain controlled amplifier for the 1st IF (36 MHz)

D

IF converter for the 2nd IF (7 MHz);

VCO circuit is controlled by external PLL

D

Internal AGC with average detection for the QAM

modulated DVB signal, reference level is adjustable

D

5 V supply voltage; low-power consumption

Package:

28-pin small outline plastic package (SO28)

D

Bandwidth of the output signal: 10 MHz (鈥? dB)

Block Diagram

I

2

C

23

5

IF 1

6

VCO

18

13

2nd IF

9

IF 2

Ref

(DVB)

10

28

7

Tuner

12

22

20

PLL

AGC:

QAM

Tuner

AGC

11

V

S

24

Band

Gap

3

8

21

12703

Control

15

Input

select

Figure 1. Block diagram

TELEFUNKEN Semiconductors

Rev. A2, 15-Jan-98

1 (7)

Preliminary Information

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