U2510B Datasheet, PDF (1/15 Pages) ATMEL Corporation – All-Band AM/FM Receiver and Audio Amplifier

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)
V_S
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
V_Ref
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
V_S
AFC mode
LED
V_S
Figure 1. Block diagram
Treble
Vol
13912
Rev. A3, 23-Feb-01
1 (15)