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U2510B

All-Band AM/FM Receiver and Audio Amplifier

Temic Semiconductors 

U2510B

All-Band AM/FM Receiver and Audio Amplifier

Description

The U2510B is an integrated bipolar one-chip AM/FM

radio circuit. It contains an FM front end with

preamplifier, FM IF and demodulator, a complete AM

receiver, an AF amplifier and a mode switch for AM, FM

and tape. This circuit is designed for clock radios and

portable radio-cassette recorders.

Features

D Superior FM strong signal behavior by using RF AGC

D Soft mute and HCC for decreasing interstation noise

in FM mode

D Excellent AFC performance (level controlled, both

polarities available)

D Level indicator (LED drive) for AM and FM

D DC mode control: AM, FM and tape

D Wide supply-voltage range and low quiescent current

D High AF output power: 1 W

D Electronic volume control

D Electronic AF bandwidth control (treble and high cut)

D Output stage for headphone and speaker drive

Block Diagram

FM ant.

FM RF

tank

FM osc.

tank

987

IF BPE

6 14 16

(Replaceable)

VS

2

26 28

FM RF

BPE

AGC

AM

ant.

AM osc.

tank

AFC

12

FM

front end

FM IF

amp.

FM

discr.

11

10

5

VRef

AFC

FM

control

AGC

AM IF

AM

front end

RF AGC

amp. and

detect.

IF

IF

AGC

AM

Voltage stab. AM/FM

AGC

and

mode control

Level

indic.

15

21

13

20 19 1 22

27

Power 3

amp.

25

23

24

AF preamp.

Volume 4

Mute

HCC

18

AM S2

FM Tape

VS

AFC mode

LED

VS

Figure 1. Block diagram

Treble

Vol

13912

TEMIC Semiconductor

Rev. A1, 06-Apr-98

1 (15)

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