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Silicore
ONE CHIP AM RADIO CIRCUIT
DESCRIPTION
The CD7642 CS is suitable for low voltage po rtable Radio, cassette system and other wireless AM system. The package of CD7642CS is TO-92.
CD7642CP
Outline Drawing
FEATURE
Low operating voltage: Down to VCC=1.3V Low Quiescent Cu rrent: ICCO=0.2 mA Low external component requ ired.
EQUIVALENT CIRCUIT
1
ABSOLUTE MAXIMUM RATINGS (Ta=25 C)
Characteristic Supply Vo ltage Operating Te mperature Storage Temp erature Symbol Vcc Topr Tstg Value 6 -10~60 -55~150 Unit
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SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn
CHMC
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Silicore
ELECTRICAL CHARACTERISTICS
CD7642CS
(Unless otherwise specified: Ta=2 5C, Vcc=1.3V, fm=1kHz, fo=1MHz,MOD=30%)
Characteristics Supply Voltage Quiescent Current Input Resistance Maximu m Sensitivity Detector Ou tput Vo ltage The Range of AGC
Test conditions Vi=0 VOD=3 mV Vi=10 mV
Symbol Vcc Icco Ri SM VOD A
Min. 1.2 0.14
Typ. 1.3 0.2 3 600
Max. 1.6 0.3
Unit V mA M V
5
15 30
30
mV dB
TEST CIRCUIT
100K 0.1uF 2 CD7642CS 3 Vin 50 1
R AGC 1.5K Vcc Vout 0.1uF
APPLICATION CIRCUIT
R AGC 820K 100K 1.5K 7.5K Vcc=1.2~1.5V 30K 32 1K
600uH 140pF 7pF
2 CD7642CS 3 1 0.01uF 0.15uF 0.1uF
Circuit 1 SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn
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CHMC
Silicore
R AGC 100K 1K 1.5M 50pF 0.1uF 0.15uF 57
CD7642CS
600uH 140pF 7pF
1.5V 32
2 CD7642CS 3 1 0.01uF
Circuit 2
R AGC 10K 100K 600uH 140pF 7pF 2 CD7642CS 3 1 0.01uF 0.1uF 0.1uF 100K 1K
1.5V
Circuit 3
CHARACTERISTIC CURVE
Detector Output Voltage VOD (dBu)
Input Vo ltage Vi (dBu) SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn
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CHMC

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