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1998 Nov 18 8
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576T
OPERATING CHARACTERISTICS
V
P
= 8.5 V; f
IF
= 10.7 MHz; R
S
=60Ω; f
m
= 400 Hz with ∆f=±22.5 kHz; 50 µs de-emphasis (C
8-9
= 6.8 nF);
T
amb
=25°C and measurements taken in Fig.1; unless otherwise specified. The demodulator circuit is adjusted at
minimum second harmonic distortion with V
iIF
= 1 mV.
Standby switch; see Fig.9
V
5
input voltage for FM on
;
V
19
= 0.3 V
2.4 2.5 − V
input voltage for FM off − 2.9 3 V
linear range − 350 − mV
I
5
input current V
5
=0to2V −−−100 µA
V
5
= 3.5 to 15 V −−1µA
temperature dependence FM on (3.5V
BE
) − 7 − mV/K
FM off (5V
BE
) − 10 − mV/K
Supply voltage smoothing
V
1-2
internal voltage drop proportional to
V
1
− 3V
BE
80 210 400 mV
R
1-2
internal resistor 5.8 8.3 10.8 kΩ
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
IF amplifier and demodulator
V
iIF(rms)
input sensitivity (RMS value) −3 dB before limiting 14 22 35 µV
S/N = 26 dB − 10 −µV
S/N = 46 dB − 55 −µV
V
oAF(rms)
AF output voltage (RMS value) 60 67 75 mV
V
oN
noise voltage for V
iIF
= 0 (RMS value;
pins 8 and 9)
R
S
= 300 Ω;
f = 250 to 15000 Hz
− 900 −µV
weighted noise voltage in accordance with
“DIN 45405”
− 2 − mV
S/N signal-to-noise ratio (pins 8 and 9) V
iIF
= 1 mV (RMS);
see Fig.3
− 72 − dB
α
AM
AM suppression V
iIF
= 0.5 to 200 mV;
FM: 70 Hz; ±15 kHz;
AM: 1 kHz; m = 30%
− 50 − dB
α
FM
FM suppression for FM off V
iIF
= 500 mV; V
5
=3V 80 −−dB
∆V
8, 9
AFC shift in relation to minimum second
harmonic distortion α
2H
V
iIF
= 0.03 to 500 mV − 25 − mV
DC offset at second harmonic distortion operating − 0 ±100 mV
mute or FM off − 0 ±50 mV
α
3H
distortion for third harmonic − 0.65 − %
RR ripple rejection V
ripple
= 200 mV on V
P
f = 100 Hz 43 48 − dB
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
3, 7
V
3, 7(max)
-----------------------
0.9=
V
5
T∆
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