PIC16C781 Datasheet

IC型号：
PIC16C781
PDF描述：
8-Bit CMOS Microcontrollers with A/D, D/A, OPAMP, Comparator...
文件大小：
3033.38KB
PDF页数：
186页
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PIC16C781/782

9.0

ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

tures a snapshot of the voltage and holds it for the

ADC. The ADC then generates the 8-bit result via suc-

cessive approximation.

The analog reference voltage (ADC

REF

) is software

selectable from the following options:

鈥?/div>

The analog positive supply: AV

The reference input for Comparator C1: V

REF

The Voltage Reference module output: V

The DAC Converter module output: V

DAC

The 8-bit ADC module, shown in Figure 9-1, has 10

inputs in the PIC16C781/782:

鈥?8 external channels, AN<7:0> (RA<3:0> and

RB<3:0>)

鈥?2 internal channels, V

and V

DAC

The ADC allows conversion of an analog input signal to

a corresponding 8-bit digital value. The desired chan-

nel is connected to a Sample-and-Hold by the input

multiplexers. The output of the Sample-and-Hold cap-

The ADC has the unique feature of being able to oper-

ate while the device is in SLEEP mode. To operate in

SLEEP, the ADC conversion clock must be derived

from the ADC鈥檚 dedicated internal RC oscillator.

FIGURE 9-1:

ADC MODULE BLOCK DIAGRAM

VOLTAGE COMPARATOR MODULE

OPA MODULE

RA0/AN0/OPA+

RA1/AN1/OPA-

RA2/AN2/V

REF

RA3/AN3/V

REF

RB0/INT/AN4/V

RB1/AN5/V

DAC

RB2/AN6

RB3/AN7/OPA

DAC MODULE

ADON

GO/DONE

REF

DAC

Sample

and

Hold

ADC

REF

ADC

ADRES

CHS<3:0>

VCFG<1:0>

MODULE

铮?/div>

2001 Microchip Technology Inc.

Preliminary

DS41171A-page 69

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