Philips Semiconductors
AM receiver
Product specification
TDA1572T
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
Unwanted signals
Suppression of IF whistles at
Vi = 15 µV; m = 0% related to AF signal
of m = 30%
α2IF
at fi ≈ 2 × fIF
α3IF
at fi ≈ 3 × fIF
IF suppression at RF input;
−
37
−
dB
−
44
−
dB
αIF
for symmetrical input
αIF
for asymmetrical input
Residual oscillator signal at mixer output;
−
40
−
dB
−
40
−
dB
I1(osc)
I1(2osc)
at fosc
at 2 × fosc
−
1
−
µA
−
1.1
−
µA
Note
1. AF signals at the IF output will be suppressed by a coupling capacitor to the demodulator and by full wave-detection
in the demodulator.
Fig.3 AF output as a function of RF input in the
circuit of Fig.1; fi = 1 MHz; fm = 400 Hz;
m = 30%.
Fig.4
Total harmonic distortion and (S + N)/N as
functions of RF input in the circuit of Fig.1;
m = 30% for (S + N)/N curve and m = 80%
for THD curve.
May 1992
11