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PC87591L Datasheet(PDF) 191 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87591L
Description  LPC Mobile Embedded Controllers
PDF  437 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87591L Datasheet(HTML) 191 Page - National Semiconductor (TI)

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Embedded Controller Modules (Continued)
Revision 1.07
191
www.national.com
When the value of DACDATA7-0 is 0016, the respective output has an output signal of 0V (AGND). When the value of
DACDATn register is FF16, the respective output has an output signal of (255/256) * AVCC. For other values, as shown in
Figure 66:
VOUT = (DACDATAn) * (AVCC / 256)
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.
0
1
2
3
(256)
255
254
. . . .
0
1/256
2/256
3/256
254/256
255/256
1
Level Data
[LSBits]
Voltage Ratio to AVCC
Figure 66. Channel Data to Output Voltage Ratio Conversion



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