pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 180

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

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4.0 Embedded Controller Modules
When the value of DACDATA7-0 is 00
DACDATn register is FF
Figure 63:
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 PC87591L-N05 output, use a low-noise analog power supply.
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 183.
16
, the respective output has an output signal of (255/256)
V
PC87591L-
OUT
AV
IDLE
= (DACDATAn)
CC
16
Figure 64. DAC Functional Diagram
, the respective output has an output signal of 0V (AGND). When the value of
AV
CC
(Continued)
VREF
VREF
VREF
VREF
DACDAT0
DACDAT1
DACDAT2
DACDAT3
Peripheral Bus
Register
AV
to other
modules
Control
*
180
DAC0
DAC1
DAC2
DAC3
DAC
(AV
CC
Analog
Power
3.3V
CC
/ 256)
DAC
*
AV
AGND
DA0
DA1
DA2
DA3
CC
. For other values, as shown in
Revision 1.2