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TDA3856T Scheda tecnica(PDF) 9 Page - NXP Semiconductors

Il numero della parte TDA3856T
Spiegazioni elettronici  Quasi-split sound processor for all standards
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Produttore elettronici  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3856T Scheda tecnica(HTML) 9 Page - NXP Semiconductors

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June 1994
9
Philips Semiconductors
Product specification
Quasi-split sound processor for all standards
TDA3856
Notes to the characteristics
1.
Crosstalk attenuation of IF input switch, measured at R12-13 = 470 Ω (instead of LC circuit);
input signal Vi (RMS) = 20 mV (pins 23-24). AGC voltage V3 set to a value to achieve Vo (RMS) = 20 mV (pins 12-13).
After switching (V5 = 0 V) measure attenuation.
IF coupling with OFWG3203 and OFWL9350 (Siemens).
2. Spurious intercarrier AM: m = (A
− B)/A
(A = signal at sync; B = signal with 100% picture modulation).
3.
For larger current: RL > 2.2 kΩ (pin 8 or 9 to GND) in order to increase the bias current of the output emitter follower.
AF signal switches
input signals: AM carrier into pin 1, 2
see part AM demodulator
FM intercarrier into pin 15
see part FM demodulator
no signal in pin 19 (AF2)
the output signals are related to the signals described in the demodulator parts.
Vo/Vomute
AF2 mute attenuation (pin 8)
B/G mode; V5 =VP
70
−−
dB
VoAM/VoFM
AF1 FM signal (pin 9) attenuation of
unwanted FM signal
L mode; V5 =0;
FM: modulated;
AM: unmodulated
70
−−
dB
VoFM/VoAM
AF1 AM signal (pin 9) attenuation of
unwanted AM signal
B/G mode; V5 =VP;
FM: unmodulated;
AM: modulated
70
−−
dB
dV8, 9
DC jump at the AF outputs
switching to FM or AM
sound or Mute
525
mV
AF performance for FM operation (standard B/G)
input signals: B/G IF input signal (pin 23, 24)
unmodulated sound carriers
different video modulation (100%)
the output signals are related to the signals described in the demodulator parts.
(S+N)/N(W) weighted signal-to-noise ratio
CCIR468-3;
de-emphasis 50
µs
black picture
fi = 5.5 MHz
59
63
dB
2T/20T pulses with white bar
fi = 5.5 MHz
57
61
dB
6 kHz sine wave, B/W-modulated
fi = 5.5 MHz
52
56
dB
250 kHz square wave, B/W-modulated
fi = 5.5 MHz
50
54
dB
black picture
fi = 5.742 MHz
57
61
dB
2T/20T pulses with white bar
fi = 5.742 MHz
55
59
dB
6 kHz sine wave, B/W-modulated
fi = 5.742 MHz
50
54
dB
250 kHz square wave, B/W-modulated
fi = 5.742 MHz
48
52
dB
Ripple rejection of the AF outputs (B/G and L standard)
RR
ripple rejection
Vripple on VP /Vripple on Vout
VR(p-p) = 200 mV;
fR =70Hz
30
40
dB
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT


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