December 1987

2

Philips Semiconductors

Product specification

AM receiver circuit

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

PACKAGE OUTLINE

18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 12.

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

Supply voltage range

7,5

−

18,0

V

Supply current range

15

−

30

mA

RF input voltage

for (S

+N)/N = 6 dB at m = 30%

−

1,5

−µV

RF input voltage for 3% total

harmonic distortion (THD) at m = 80%

−

500

−

mV

−

230

−

mV

−

310

−

mV

−

86

−

dB

−

2,8

−

V