TDA8742 Datasheet, PDF (2/21 Pages) NXP Semiconductors – Satellite sound circuit with noise reduction

Philips Semiconductors
Satellite sound circuit with noise reduction
Product specification
TDA8742; TDA8742H
FEATURES
• Demodulation of main audio signal using wide band PLL
(lock range selectable)
• HF input selection: two-out-of-eight secondary audio
signals can be selected
• Demodulation of secondary audio signals using wide
band PLL
• Noise reduction of the secondary audio signals
• Output selection: stereo, language 1, language 2, main
audio and external
• Mute control
• Line outputs (SCART level).
APPLICATIONS
• Satellite receivers
• TV sets
• Video recorders.
GENERAL DESCRIPTION
The TDA8742; TDA8742H is a multi-function sound IC for
use in satellite receivers, television sets and video
recorders. The pin numbers given in parenthesis
throughout this document refer to the QFP44 package.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
Supply
V_P
supply voltage
Main channel
V_IN3(rms)
∆f_OM
V_OM
S/N(A)
input sensitivity pin 18 (14) (RMS value)
lock range PLL demodulator
either
or
output voltage pin 23 (19)
signal-to-noise ratio
Secondary channels
V_IN1,IN2(rms) input sensitivity pins 2, 4, 6, 8, 10, 12, 14 and 16
(1, 3, 5, 7, 9, 11, 40 and 42) (RMS value)
∆f_OS1,2
lock range PLL demodulators
V_OR,OL
output voltage pins 24 and 25 (20 and 21)
S/N(A)
signal-to-noise ratio
Crosstalk
α_S/M
α_M/S
α_S/S
crosstalk from secondary to main channel
crosstalk from main to secondary channel
crosstalk between secondary channels
CONDITIONS MIN. TYP. MAX. UNIT
8
12 13.2 V
S/N(A) = 40 dB −
1.0 2.0 mV
A-weighted
5.5 −
10.0 −
−9
−6
62 70
7.5 MHz
11.5 MHz
−4
dBV
−
dB
S/N(A) = 40 dB −
0.8
A-weighted
10.0 −
−8
−6
72 80
1.5 mV
11.5 MHz
−4
dBV
−
dB
−
74
−
dB
−
74
−
dB
−
74
−
dB
October 1994
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