TDA3857 查看數據表（PDF） - Philips Electronics
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TDA3857 Datasheet PDF : 14 Pages
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Philips Semiconductors
Quasi-split sound processor with two FM demodulators
Product specification
TDA3857
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
AF performance for FM operation (standard B/G)
input signals: B/G IF input signal (pin 1, 20)
unmodulated sound carriers
different video modulation (100%)
the output signals are related to the signals described in the demodulator part.
(S+N)/N(W) weighted signal-to-noise ratio
CCIR468-3;
de-emphasis 50 µs
black picture
2T/20T pulses with white bar
6 kHz sine wave, B/W-modulated
250 kHz square wave, B/W-modulated
black picture
2T/20T pulses with white bar
6 kHz sine wave, B/W-modulated
250 kHz square wave, B/W-modulated
fi = 5.5 MHz
fi = 5.5 MHz
fi = 5.5 MHz
fi = 5.5 MHz
fi = 5.742 MHz
fi = 5.742 MHz
fi = 5.742 MHz
fi = 5.742 MHz
59
63
−
dB
57
61
−
dB
52
56
−
dB
50
54
−
dB
57
61
−
dB
55
59
−
dB
50
54
−
dB
48
52
−
dB
Ripple rejection of the AF outputs
RR
ripple rejection
Vripple on VP / Vripple on Vout
VR(p-p) = 200 mV;
fR = 70 Hz
30
40
−
dB
Notes to the characteristics
1. Spurious intercarrier AM: M = (A − B)/A
(A = signal at sync; B = signal with 100% picture modulation).
2. AF signal can be adjusted by V3.
3. For larger current: RL > 2.2 kΩ (pin 6 or 7 to GND) in order to increase the bias current of the output emitter follower.
4. If not used, pin 3 should not be connected.
5. Automatic Frequency Control (AFC) of the vision carrier reference circuit (pins 10 and 11) for reducing spurious video
signals in the stereo/dual sound modes. The factor of reducing FTR at deviation ∆fVC specifies the ratio of spurious
signals with/without tracking function.
June 1994
9
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