1997 Feb 27 9
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio receivers TDA1597
Note
1.
Tuning stop detector
∆fSTOP-0 detuning frequency for STOP-0
(pin 15) V15 ≥3.5 V; seeFig.11 −−26 kHz
V15 ≤0.3 V; seeFig.11 38 −−kHz
∆fSTOP-1 detuning frequency for STOP-1
(pin 14) V14 ≥3.5 V; see Fig.10 −−−26 kHz
V14 ≤0.3 V; see Fig.10 −38 −−kHz
V20(rms) dependence on input voltage for
STOP-0 and STOP-1
(RMS value)
V14,15 ≥3.5 V; see Fig.9 250 −−µV
V
14,15 ≤0.3 V; see Fig.9 −−50 µV
R8internal low-pass resistance of
detune detector 12 25 50 kΩ
V8voltage on capacitor Vi≤5µV (RMS) on input pin 20;
I7=0
−2.2 −V
Level detector (I2=0)
V
6output voltage V20 ≤5µV (RMS) 0.1 −1.1 V
V20 = 1 mV (RMS) 3.0 −4.2 V
Reference voltage source (pin 5)
Vref reference output voltage I5=−1 mA 3.3 3.7 4.1 V
Operation with AM-IF
Level and stop information (on pins 6, 13, 14, 15 and 16) is provided for the modes FM-MUTE-ON and
FM-MUTE-OFF. This information is also available in the FM-OFF mode when an AM-IF signal is input (for example
455 kHz). This can also provide a valid detuning information when a suitable AM-IF resonance circuit is provided for
demodulator (see Fig.18).
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
α20 ∆V4FMMUTE–OFF–()
∆V
4FM MUTE–ON–()
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