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U4311B-FS Datasheet

  • U4311B-FS

  • Low-Current Superhet Remote Control Receiver

  • 13頁(yè)

  • ATMEL   ATMEL

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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
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
Block Diagram
Wake-up out
V
S
19
V
Ref
= 2.4V 17
Bandgap
15
Internal
V
Ref
= 2.4 V
Monoflop
RF
Level
Wake up
Non 鈥?invert.
clamping
comparator
13
3
9
7
6
Data out
10.7 MHz
12
IF
amplifier
Quadrature
detector
Operational
amplifier
鈥?/div>
5
11
16
18
FM out
Data
filter
20
+
1
12648
2
log AM out
10.7 MHz
Figure 1. Block diagram
Ordering Information
Extended Type Number
U4311B-MFSG3
Package
SSO20
Remarks
Ambient temperature up to +105擄C
Rev. A3, 28-Sep-00
1 (13)

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