pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 191

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
Embedded Controller Modules
When the value of DACDATA7-0 is 00
DACDATn register is FF
Figure 66:
Reference Voltage
The analog output voltages are converted relative to a reference voltage. The reference voltage of the converters is the an-
alog power supply. To assure good signal quality at the output, a low-noise analog power supply should be used.
Conversion Time
When a DAC channel is enabled, the conversion is started by writing to DACDATn registers. The output settling time is de-
fined as the time the DAC requires to get to within 1/2 LSB of the final value; see “Output Settling Time” on page 195.
Voltage Ratio to AV
16
, the respective output has an output signal of (255/256)
V
OUT
Figure 66. Channel Data to Output Voltage Ratio Conversion
254/256
255/256
3/256
2/256
1/256
= (DACDATAn)
16
CC
1
0
, the respective output has an output signal of 0V (AGND). When the value of
0
(Continued)
1
2
3
*
191
(AV
CC
. . . .
/ 256)
254
255
*
AV
(256)
CC
. For other values, as shown in
Level Data
[LSBits]
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