March 1989

2

Philips Semiconductors

Product specification

AM receiver circuit

TDA1072AT

GENERAL DESCRIPTION

The TDA 1072AT integrated AM receiver circuit performs the active and part of the filtering functions 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 voltage-controlled 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.

QUICK REFERENCE DATA

PACKAGE OUTLINE

16-lead mini-pack; plastic (SO16; SOT109A); SOT109-1; 1996 August 13.

PARAMETER

CONDITIONS

SYMBOL

MIN.

TYP.

MAX.

UNIT

Supply voltage range

7.5

−

10

V

Supply current range

15

−

26

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

AF output voltage with

−

310

−

mV

−

86

−

dB

Field strength indicator

−

2.8

−

V