TDA8740 datasheet(2/24 Pages) PHILIPS

2 / 24 page

October 1994

Philips Semiconductors

Product speciﬁcation

Satellite sound circuit with noise reduction

TDA8740; TDA8740H

FEATURES

• Demodulation of main audio signal using wide band PLL

(lock range selectable)

• Demodulation of secondary audio signals using wide

band PLL

• HF input selection: two-out-of-eight secondary audio

signals can be selected

• 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 TDA8740; TDA8740H 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

supply voltage

13.2

Main channel

VIN3(rms)

input sensitivity pin 18 (14) (RMS value)

S/N(A) = 40 dB

−

1.0

2.0

∆fOM

lock range PLL demodulator

either

5.5

−

7.5

MHz

10.0

−

11.5

MHz

VOM

output voltage pin 23 (19)

−9

−6

−4

dBV

S/N(A)

signal-to-noise ratio

A-weighted

−

Secondary channels

VIN1,IN2

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

∆fOS1,2

lock range PLL demodulators

6.0

−

8.5

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

−

Crosstalk

S/M

crosstalk from secondary to main channel

−

αM/S

crosstalk from main to secondary channel

−

αS/S

crosstalk between secondary channels

−

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