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TDA1572

AM receiver circuit

Philips Electronics 

Philips Semiconductors

AM receiver circuit

Product specification

TDA1572

PARAMETER

Unwanted signals

Suppression of IF whistles at

Vi = 15 µV; m = 0% related to AF signal

of m = 30%

at fi ≈ 2 × fIF

at fi ≈ 3 × fIF

IF suppression at RF input;

for symmetrical input

for asymmetrical input

Residual oscillator signal at mixer output;

at fosc

at 2 × fosc

SYMBOL

MIN.

TYP. MAX. UNIT

α2IF

α3IF

αIF

αIF

I1(osc)

I1(2osc)

−

**

−

dB

−

**

−

dB

−

40

−

dB

−

40

−

dB

−

1

−

µA

−

1,1

−

µA

* AF signals at the IF output will be suppressed by a coupling capacitor to the demodulator and by full wave-detection in

the demodulator.

** Value to be fixed.

APPLICATION INFORMATION

(1) Capacitor values depend on crystal type.

(2) Coil data: 9 windings of 0,1 mm dia laminated Cu wire on TOKO coil set 7K 199CN; Qo = 80.

Fig.2 Oscillator circuit using quartz crystal; centre frequency = 27 MHz.

December 1987

9

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