SN66120B
4-Channel Speech Controller
5.8. IR Function
P33 can be modulated with 42KHz square wave before sent out to P33 pin. The
IR signal can be achieved by this modulated signal.
42KHZ
"1"
PAD
Mode
P33
5.9. 2 8-bit DAC
Two 8-bit current type digital-to-analog converters are built-in SN66120B. The
relationship between 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
…
255
n*(3/255)
3
VC
C
VC
C
VC
C
VO1
VO2
VO1
VO2
1K
1K
1K
Two Speaker Application
One Speaker Application
6
Ver: 1.1
December 6, 2004
SONIX [ SONIX TECHNOLOGY COMPANY ]
