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April 1991 10
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers
TDA1596T
OPERATING CHARACTERISTICS
f = 10.7 MHz; V
I
= V
20(rms)
= 1 mV; deviation (∆f) = 22.5 kHz; modulation frequency (f
m
) = 400 Hz; de-emphasiss (pin 4)
= 50 µs; test circuit as per Fig.3; tuned circuit (Q
L
= 19) aligned for symmetrical stop pulses; T
amb
= + 25 °C; unless
otherwise specified
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
V
4(rms)
AF output voltage (RMS value) at
V
20(rms)
= 10 mV
180 200 220 mV
V
20(rms)
Start of limiting (FM, mute-off); (RMS value)
(Fig.13)
14 22 35 µV
Dependence of signal-to-noise ratio (in noise
frequency band 250 Hz to 15 kHz, unweighted)
on input voltage
V
18(rms)
for S/N = 26 dB − 15 −µV
V
18(rms)
for S/N = 46 dB − 60 −µV
S/N at V
20(rms)
= 10 mV; ∆f = 75 kHz − 82 − dB
THD THD (FM, mute-on) at V
20(rms)
= 10 mV; ∆f = 75
kHz; f
m
= 1 kHz; without detuning; without
de-emphasis; I
7
= 0 mA
− 0.1 0.3 %
α
D
Dynamic mute attenuation (Fig.14) − 16 − dB
with f
m
= 100 kHz; ∆f = 75 kHz
α
D
∆f Slope of attenuation curve − 0.8 − dB/kHz
THD (FM, mute-on) at V
20(rms)
= 10 mV;
∆f = 75 kHz; f
m
= 1 kHz;
detuning ≤± 25 kHz without
THD de-emphasis; I
7
= 0 mA (Fig.15) −−0.6 %
THD (FM, mute-off and compensated via
pin 3) at V
20(rms)
= 10 mV;
∆f = 75 kHz; f
m
= 1 kHz;
THD V
7
= V
5
− 0.07 0.25 %
V
3
Voltage range at pin 3 for THD compensation 0 − V
5
V
AM suppression (FM, mute-off) with amplitude
modulation at 30% input voltage range
V
20
= 300 µV to 100 mV (Fig.16)
− 65 − dB
Power supply ripple rejection = 20log [∆V
1
/∆V
4
]33 36 − dB
Mute attenuation (FM-off)
= 20log [V
4(FM-on
/V
4(FM-off)
]
60 −−dB
α
D
20
V
4
FM mute off )–(
V
4
FM mute,( on )–
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