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TDA1572T

AM receiver

Philips Electronics 

Philips Semiconductors

AM receiver

Product specification

TDA1572T

GENERAL DESCRIPTION

The TDA1572T 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

SYMBOL

VP

IP

ViFR(rms)

ViRF(rms)

VoIF(rms)

PARAMETER

Supply voltage range

Supply current range

RF input voltage (RMS value)

for (S + N)/N = 6 dB

for THD = 3%

IF output voltage (RMS value)

AF output voltage (RMS value)

VoAF(rms)

∆Vi

Vo

AGC range

Change of Vi for 1 dB

change of VoAF

Indicator driver (pin 13)

Output voltage

CONDITIONS

VP = 8.5 V

MIN.

7.5

15

TYP.

8.5

25

MAX.

14.0

28

UNIT

V

mA

m = 30%

−

1.5

−

µV

m = 80%

−

500

−

mV

Vi = 2 mV(rms)

180

230

290

mV

Vi = 2 mV(rms);

fi = 1 MHz; m = 30%;

fm = 400 Hz

240

310

390

mV

−

86

−

dB

Vi = 500 mV(rms);

RL = 2.7 kΩ

2.5

2.8

3.1

V

PACKAGE OUTLINE

20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 13.

May 1992

2

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