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U4311B-FS Datasheet

Low-Current Superhet Remote Control Receiver

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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
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
VRef = 2.4V 17
VS
19
Bandgap
15
Internal
VRef = 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
amplifier
2
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)
Free Datasheet http://www.datasheet-pdf.com/


Atmel Electronic Components Datasheet

U4311B-FS Datasheet

Low-Current Superhet Remote Control Receiver

No Preview Available !

U4311B-FS
Pin Description
OPin+ 1
OPout 2
RCwake 3
n.c. 4
GND2 5
Compout 6
RC7
n.c. 8
RC+ 9
n.c. 10
20 OPin
19 VS
18 FMout
17 VRef
16 Discr
15 GND1
14 n.c.
13 SWout
12 IFin
11 AMout
12649
Figure 2. Pinning
Pin Symbol
Function
1 OPin+ OP amplifier non-inverted input
2 OPout OP amplifier output
3 RCwake RC wakeup reset time
4 n.c. Not connected
5 GND2 Ground of the logical circuits
6 Compout Comparator output
7 RCComparator time constant
8 n.c. Not connected
9 RC+ Comparator time constant
10 n.c. Not connected
11 AMout AM current output
12 IFin IF input
13 SWout Wake-up output
14 n.c. Not connected
15 GND1 Ground of the analog circuits
16 Discr FM discriminator tank
17 VRef Reference voltage
18 FMout FM discriminator output
19 VS Supply voltage
20 OPinOP amplifier inverted input
Internal connections see figures 4 to 19
Absolute Maximum Ratings
Parameters
Supply voltage
Power dissipation Tamb = 85°C
Junction temperature
Storage temperature
Ambient temperature for SSO20
Thermal Resistance
Junction ambient
Parameters
SSO20
Symbol
VS
Ptot
Tj
Tstg
Tamb
Value
13
400
125
55 to +125
40 to +105
Unit
V
mW
°C
°C
°C
Symbol
RthJA
Value
140
Unit
K/W
2 (13)
Rev. A3, 28-Sep-00
Free Datasheet http://www.datasheet-pdf.com/


Part Number U4311B-FS
Description Low-Current Superhet Remote Control Receiver
Maker Atmel
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U4311B-FS Datasheet PDF






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