TDA3856 Datasheet, PDF (9/17 Pages) NXP Semiconductors – Quasi-split sound processor for all standards

Philips Semiconductors
Quasi-split sound processor for all standards
Product specification
TDA3856
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
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.
V_o/V_omute
V_oAM/V_oFM
AF2 mute attenuation (pin 8)
AF1 FM signal (pin 9) attenuation of
unwanted FM signal
B/G mode; V₅ = V_P
L mode; V₅ = 0;
FM: modulated;
AM: unmodulated
70 −
−
dB
70 −
−
dB
V_oFM/V_oAM AF1 AM signal (pin 9) attenuation of
unwanted AM signal
B/G mode; V₅ = V_P;
FM: unmodulated;
AM: modulated
70 −
−
dB
dV_{8, 9}
DC jump at the AF outputs
switching to FM or AM
−
5
25
mV
sound or Mute
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
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
CCIR468-3;
de-emphasis 50 µs
f_i = 5.5 MHz
f_i = 5.5 MHz
f_i = 5.5 MHz
f_i = 5.5 MHz
f_i = 5.742 MHz
f_i = 5.742 MHz
f_i = 5.742 MHz
f_i = 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 (B/G and L standard)
RR
ripple rejection
V_ripple on V_P / V_ripple on V_out
V_R(p-p) = 200 mV;
f_R = 70 Hz
30 40 −
dB
Notes to the characteristics
1. Crosstalk attenuation of IF input switch, measured at R_12-13 = 470 Ω (instead of LC circuit);
input signal V_{i (RMS)} = 20 mV (pins 23-24). AGC voltage V₃ set to a value to achieve V_{o (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: R_L > 2.2 kΩ (pin 8 or 9 to GND) in order to increase the bias current of the output emitter follower.
June 1994
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