TC9293F/FN/N

2003-06-27

8

7. Soft Mute Circuit

This IC is a built-in soft mute circuit, it is possible to do soft mute, when SM pin is changed “L” level to

“H” level during parallel mode.

Characteristic of soft mute ON/OFF and DA converter output level is as follows.

While output level is changing, it is not possible to accept soft mute ON/OFF control.

8. Description of Internal Control Signal

Parallel and serial modes can be selected by the

S

P/

pin. The controll functions are described as follow.

8-1

Parallel Mode (

S

P/

pin

==== “H”)

In parallel mode, pin 18, 19, 20 are set as follows.

Table 4 Pin Names at Parallel Mode

Pin No.

Pin Name

Function

18

BS

De-emphasis filter mode select pin.

19

EMP

De-emphasis filter control pin.

20

SM

Soft mute control pin.

Figure 9 Soft Mute DA Converter Output Level