Chapter 3
90
••••
Peripheral Control
eSL/eSLS Series (+ eSLZ000) User’s Manual
3.5 Digital to Analog Converter (DAC)
DAC is a 12-bit resolution current-steering digital-to-analog converter used for
voice and audio applications. It can be directly terminated with resistive loads
to produce voltage outputs. In current-mode DAC, the power efficiency is very
high since almost all power is dissipated in the load resistor at the output.
3.5.1 Features
•
Special layout matrix for less sensitive to mismatch
•
Band gap circuit to generate current mirror source
DAC Attributes and Definitions:
Item
Resource
Clock source
Timer0/1 interrupt
Usage register
DACD, DACCON
I/O function pin
DACO
Operation mode
Unsigned, 2’s complement
3.5.2 Operation
DA[11:0]
Output Current
FFF
FFE
…
N
….
001
000
4095 * I
LSB
*
(I
MAX
=3m A)
**
N * I
LSB
I
LSB
0
*
I
LSB
:
The unit current from current mirror
**
I
MAX
:
Full scale current
3.5.3 Registers
DAC Control (DACCON) Register
Attributes and Definitions:
DACCON
Bit
DIR.
Description
Reset Value
DACEN
[15]
R/W
The duty ratio of DAC channel Enable
0
DAC2SC
[5]
R/W
DAC “2” complement mode control
:
0:
Unsigned mode
1:
“2” complement mode
0
DACMOD
[4:3]
R/W
DAC Data 0 (DACD0) output mode
:
00:
Always bypass
01:
Trigger on Timer 0 interrupt flag
10:
Trigger on Timer 1 interrupt flag
11:
Trigger on Timer 0 /1 interrupt flag
00
DACVOL
[2:0]
R/W
DAC volume control
111
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