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
D
D
D
D
D
DC mode control: AM, FM and tape
Wide supply-voltage range and low quiescent current
High AF output power: 1 W
Electronic volume control
Electronic AF bandwidth control (treble and high cut)
Output stage for headphone and speaker drive
Block Diagram
FM RF
tank
FM ant.
V
S
9
8
7
AFC
FM RF
BPE
AGC
12
FM
front end
FM
AGC
AM
front end
RF AGC
Voltage stab. AM/FM
and
mode control
15
21
13
20
19
1 22
IF
AGC
AM
AGC
AFC
control
AM IF
amp. and
detect.
IF
Level
indic.
AF preamp.
Volume
Mute
HCC
18
FM IF
amp.
FM
discr.
Power
amp.
25
23
24
4
6
14
16
2
26
28
27
3
FM osc.
tank
IF BPE
(Replaceable)
11
AM
ant.
AM osc.
tank
10
5
V
Ref
AM
S
2
V
S
AFC mode
LED
V
S
Treble
Vol
13912
FM Tape
Figure 1. Block diagram
TEMIC Semiconductor
Rev. A1, 06-Apr-98
1 (15)
TEMIC [ TEMIC SEMICONDUCTORS ]
