U4240B Datasheet, PDF (1/8 Pages) TEMIC Semiconductors – AM - RECEIVER

TELEFUNKEN Semiconductors
U4240B
AM-Receiver
Description
The U4240B is a bipolar integrated AM receiver circuit.
It performs all the active functions and part of the filtering
required of the AM radio receiver. The device is designed
for car radio and home receiver applications.
Features
D ESD protected
D IF output for stereo demodulator and
stop signal generation
D AF preamplifier with simple filtering
D Controlled RF preamplifier
D Double balanced mixer
D Separate oscillator with amplitude control
D IF amplifier with gain control
D Balanced full-wave detector
D Audio preamplifier
D Internal AGC voltage
D Amplifier for field-strength indication
D Electronic standby ON/ OFF switch
Block Diagram
GND
18 (20)
Controlled
RF
preamplifier
Balanced
mixer
AM-antenna
tank
17 (19)
16 (17)
V_S
15 (16)
AM-oscillator
tank
14 (15)
13 (14) 12 (13)
170 W
150 W
11 (12) 10 (11)
50 W
5 kW 5 kW
Internal
supply
voltage
Controlled
oscillator
Standby
switch
Controlled
IF amplifier
Balanced
full-wave
detector
AF
amplifier
Indicator
driver
Control
voltage
amplifier
AM-IF
output
3.5 kW
7 kW
12 kW
1 (1)
2 (2)
3 (4) 4 (5)
5 (6)
IF BPF
( ) SSO 20
Figure 1.
7 kW
6 (7) 7 (8)
8 (9) 9 (11)
93 7715 e
Rev. A1: 12.07.1995
1 (8)