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U4459B

IF Amplifier for Cable DVB Processing

Description

The U4459B is an integrated bipolar circuit suitable for

the IF processing in cable-DVB receiver (DVB =

Digital

Video Broadcasting)

and cable network application.

The circuit contains a wideband IF amplifier, mixer stage,

gain control for the IF amplifier and a tuner-AGC

(Automatic

Gain Control)

with adjustable take over point

for an additional external preamplifier (tuner).

Features

D

Input frequency range 30 to 50 MHz (1st IF)

D

Wideband IF amplifier with high linearity

D

Gain control of the IF amplifier by external

dc voltage

D

High output level of mixed signal (2nd IF)

(up to 2.4 V, peak-to-peak value)

D

Tuner-AGC with adjustable take over point for a

preamplifier

D

Supply voltage range 6.8 to 13.5 V

Package:

DIP16

D

Mixer stage with local oscillator input

(symmetrical or unsymmetrical)

LO in

8

IF1 in

1

IF amp

LO in

9

95 9636

6

16

IF1 in

Mixer

IF2 out

IF gain

control

3

I

Tun

Bandgap

14

V

S

2

V

Tun

5

V

Gain

13

BG

4,15

GND

Figure 1. Block diagram

TELEFUNKEN Semiconductors

Rev. A1, 15-Jul-96

1 (7)

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