TDA8742H datasheet(2/21 Pages) PHILIPS

部件名	TDA8742H

功能描述	Satellite sound circuit with noise reduction

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制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

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2 / 21 page

October 1994

2

Philips Semiconductors

Product speciﬁcation

Satellite sound circuit with noise reduction

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

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

VP

supply voltage

8

12

13.2

V

Main channel

VIN3(rms)

input sensitivity pin 18 (14) (RMS value)

S/N(A) = 40 dB

−

1.0

2.0

mV

∆fOM

lock range PLL demodulator

either

5.5

−

7.5

MHz

or

10.0

−

11.5

MHz

VOM

output voltage pin 23 (19)

−9

−6

−4

dBV

S/N(A)

signal-to-noise ratio

A-weighted

62

70

−

dB

Secondary channels

VIN1,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)

S/N(A) = 40 dB

−

0.8

1.5

mV

∆fOS1,2

lock range PLL demodulators

10.0

−

11.5

MHz

VOR,OL

output voltage pins 24 and 25 (20 and 21)

−8

−6

−4

dBV

S/N(A)

signal-to-noise ratio

A-weighted

72

80

−

dB

Crosstalk

α

S/M

crosstalk from secondary to main channel

−

74

−

dB

αM/S

crosstalk from main to secondary channel

−

74

−

dB

αS/S

crosstalk between secondary channels

−

74

−

dB

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