TA7642.pdf

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TA7642
LINEAR INTEGRATED CIRCUIT
ONE CHIP AM RADIO CIRCUIT
DESCRIPTION
The
TA7642
is suitable for low voltage portable
Radio, cassette system and other wireless AM
system. The package of UTC7642 is TO-92.
FEATURES
*Low operating voltage: Down to V
CC
=1.3V
*Low Quiescent Current:I
CCO
=0.2mA
*Low external component required.
1
TO-92
EQUIVALENT CIRCUIT
3
R3
12K
R5
12K
R6
12K
R9
12K
R11
12K
R13
12K
C4
23pF
R15
12K
2
T1
C1
12pF
R4
12K
T4
R2
3.3K
C2
12pF
R7
12K
R8
12K
T5
T6
R10
12K
R12
12K
R14
74.6
T10
R1
5.6K
T7
T8
T9
T2
T3
1
ABSOLUTE MAXIMUM RATINGS
Parameters
Supply Voltage
Operating Temperature
Storage temperature
Symbols
V
CC
Topr
T
STG
Tested at Ta=25°C,unless otherwise specified
Min.
-10
-55
Max.
6
60
150
Unit
V
°C
°C
SUM
1
TA7642
ELECTRICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
(Tested at Ta=25°C,V
CC
=1.3V,fm=1kHz,f
O
=1MHz,MOD=30%,unless other specified)
Parameters
Supply Voltage
Quiescent Current
Input Resistance
Maximum sensitivity
Detector Output Voltage
The Range of AGC
Symbols
V
CC
I
CCQ
R
I
SM
V
OD
∆A
Test conditions
V
I
=0
V
OD
=3mV
V
I
=10mV
Min.
1.2
0.14
ü
ü
5
ü
Typ.
1.3
0.20
3
600
15
30
Max.
1.6
0.30
ü
ü
30
ü
Unit
V
mA
MΩ
µV
mV
dB
TEST CIRCUIT
RAGC
1.5k
100k
Vcc
0.01µF
2
Vin
75
TA7642
1
3
0.1µF
Vout
APPLICATION CIRCUIT
R
AGC
1k
100k
600µH
140pF
7pF
820k
7.5k
57
2
TA7642
1
3
0.1µF
1.5V
0.15µF
32
1k
0.01µF
SUM
2
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