TDA8741 datasheet(13/24 Pages) PHILIPS

13 / 24 page

October 1994

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

THD of maximum 0.5%; VP = 8 to 13.2 V; Tamb = −20 to +70 °C.

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

1 kHz signals should be present with typical levels of 9 mV (RMS) and THD of maximum 0.5%; VP = 8 to 3.2 V;

Tamb = −20 to +70 °C.

4. All PLLs locked; RS1 =RS2 = 0.68 kΩ.

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

stereo

1100

left

1000

right

0100

main

0000

external

mute secondary

mute all

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