SN66012B

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.

Mode

42KHZ

P33

PAD

"1"

5.9. 2 8-bit DAC

Two 8-bit current type digital-to-analog converters are built-in SN66012B. 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

n*(3/255)

…

255

3

VO2

VO1

VC

C

1K

VC

C

1K

Two Speaker Application

VO2

VO1

VC

C

1K

One Speaker Application

Ver: 1.1

December 6, 2004

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