SNC678

4-Channel Speech Controller

5.8 IR Function

P33 can be modulated with 38.5KHz square wave before sent out to P33 pin. The IR

signal can be achieved by this modulated signal.

Mode

38.5KHZ

P33

PAD

"1"

5.9 8-bit DAC

An 8-bit current type digital-to-analog converter is built-in SNC678. The relationship

between of input digital data and output analog current signal is listed in the following

table. Also, the recommended application circuit is illustrated as follows.

Input data

Typical value of output current (mA)

0

0

1

3/255

…

N

n*(3/255)

…

255

3

SNC678

VO

VC

C

1K

D/A S pe a ke r Applica tion

Ver: 1.3

June 8, 2005

7