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.
38.5KHZ
"1"
PAD
Mode
P33
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
0
1
…
N
…
255
Typical value of output current (mA)
0
3/255
n*(3/255)
3
VC
C
VO
1K
S NC678
D/A S pe a ke r Applica tion
Ver: 1.3
7
June 8, 2005
SONIX [ SONIX TECHNOLOGY COMPANY ]
