TDA1572 데이터 시트보기 (PDF) - Philips Electronics
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TDA1572 Datasheet PDF : 19 Pages
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Philips Semiconductors
AM receiver circuit
Product specification
TDA1572
GENERAL DESCRIPTION
The TDA1572 integrated AM receiver circuit performs all the active functions and part of the filtering required of an AM
radio receiver. It is intended for use in mains-fed home receivers and car radios. The circuit can be used for oscillator
frequencies up to 50 MHz and can handle RF signals up to 500 mV.
RF radiation and sensitivity to interference are minimized by an almost symmetrical design. The controlled-voltage
oscillator provides signals with extremely low distortion and high spectral purity over the whole frequency range, even
when tuning with variable capacitance diodes. If required, band switching diodes can easily be applied. Selectivity is
obtained using a block filter before the IF amplifier.
Features
• Inputs protected against damage by static discharge
• Gain-controlled RF stage
• Double balanced mixer
• Separately buffered, voltage-controlled and temperature-compensated oscillator, designed for simple coils
• Gain-controlled IF stage with wide AGC range
• Full-wave, balanced envelope detector
• Internal generation of AGC voltage with possibility of second-order filtering
• Buffered field strength indicator driver with short-circuit protection
• AF preamplifier with possibilities for simple AF filtering
• Electronic standby switch
• IF output for stereo demodulator and search tuning.
QUICK REFERENCE DATA
PARAMETER
Supply voltage range
Supply current range
RF input voltage
for (S+N)/N = 6 dB at m = 30%
RF input voltage for 3% total
harmonic distortion (THD) at m = 80%
IF output voltage with Vi = 2 mV
AF output voltage with Vi = 2 mV;
fi = 1 MHz; m = 30%; fm = 400 Hz
AGC range: change of Vi for
1 dB change of Vo(AF)
Field strength indicator voltage at Vi = 500 mV;
RL(11) = 2,7 kΩ
SYMBOL
VP
IP
MIN.
7,5
15
TYP.
−
−
MAX.
18,0
30
UNIT
V
mA
Vi(RF)
−
1,5
−
µV
Vi(RF)
Vo(IF)
−
500
−
mV
−
230
−
mV
Vo(AF)
−
310
−
mV
−
86
−
dB
VIND
−
2,8
−
V
PACKAGE OUTLINE
18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 12.
December 1987
2
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