U4311B Datasheet, PDF (1/14 Pages) TEMIC Semiconductors – Low-current Superhet Remote Control Receiver

TELEFUNKEN Semiconductors
U4311B
Low–Current Superhet Remote Control Receiver
Description
The U4311B is a monolithic Integrated Circuit in bipolar
technology for low-current UHF remote control super-
heterodyne receivers in amplitude- or frequency-
modulated mode. Typical applications are keyless car
lock-, alarm or telecontrol remote indication systems.
Especially for automotive applications it supports a
superhet design with about 1 mA total current consump-
tion, as required by the car manufacturers.
Features
D Usable for amplitude- and frequency- modulated
transmission systems
D Extremely low quiescent current approximately 1 mA
in the stand-by mode due to wake-up concept
D Wide power supply voltage range 3 to 13 V
D Sensitive IF-amplifier for 10.7 MHz operating
frequency
D Logarithmic AM demodulator
D FM demodulator
D Monoflop exit to wake up a microcontroller
D High performance operational amplifier to realize a
data recovering filter
D Non-inverting clamping comparator with amplitude-
depending hysteresis for data regeneration
Block Diagram
Wake up out
V_S
V_Ref = 2.4V ₁₃
Bandgap
11
Internal
V_Ref = 2.4 V
10
3
Monoflop
RF
Level
Wake up
7
6
Non – invert.
clamping
comparator
5 ^{Data out}
10.7 MHz
9
4
IF
amplifier
Quadrature
detector
Operational
2
amplifier
8
12
log AM out
–
14
16
FM out
+
1
95 9968
10.7 MHz
Figure 1. Block diagram
Data
filter
Rev. A1: 23.06.1995
1 (14)