U4311B-FS Datasheet, PDF (1/13 Pages) ATMEL Corporation – Low-Current Superhet Remote Control Receiver

U4311B-FS
Low-Current Superhet Remote Control Receiver
Description
The U4311B-FS 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 tele-control remote indication systems.
Especially for automotive applications, it supports a
superhet design with about 1 mA total current
consumption 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 standby 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
Block Diagram
D Logarithmic AM demodulator
D FM demodulator
D Monoflop output 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
Wake-up out
V_Ref = 2.4V ₁₇
V_S
19
Bandgap
15
Internal
V_Ref = 2.4 V
13
3
9
7
Monoflop
RF
Level
Wake up
Non – invert.
clamping
comparator
6 ^{Data out}
10.7 MHz
12
IF
amplifier
Quadrature
detector
Operational
2
amplifier
5
11
16
log AM out
–
18
20
FM out
+
1
12648
10.7 MHz
Data
filter
Figure 1. Block diagram
Ordering Information
Extended Type Number
U4311B-MFSG3
Package
SSO20
Remarks
Ambient temperature up to +105°C
Rev. A3, 28-Sep-00
1 (13)