October 1994

13

Philips Semiconductors

Product specification

Satellite sound circuit with noise reduction

TDA8741; TDA8741H

Notes to the AC characteristics

1. At pin 20 (16) the demodulated 1 kHz signal should be present with a typical level of 158 mV (RMS) (

−16 dBV), and

2. Modulation of main channel is OFF; modulation of secondary channels is ON.

3. The electrolytic capacitors at pins 40 and 42 (36 and 38) are removed and 1500 pF capacitors between pin 40 (36)

and ground and between pin 42 (38) and ground are connected. At pins 40 and 42 (36 and 38) the demodulated

5. Modulation of secondary channel being measured and main channel is OFF; modulation of other secondary channel

is ON.

6. Modulation of main channel is ON; modulation of secondary channels is OFF.

7. Measured at pins 38 (34) (left) and 30 (26) (right) and no electrolytic capacitors connected to these pins.

Table 1

Truth table for output selection (note 1)

Note

1. X = don’t care.

SWITCH

POSITION

STATE

PIN 15 (10)

PIN 17 (13)

PIN 26 (22)

PIN 13 (8)

OUTSEL L

OUTSEL R

EXT/INT

MUTE

1

stereo

1100

2

left

1000

3

right

0100

4

main

0000

5

external

X

X

1

0

6

mute secondary

X

X

0

1

7

mute all

X

X

1

1