MCP3903 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

MCP3903

Six Channel Delta Sigma A/D Converter

Microchip Technology 

MCP3903

Functional Block Diagram

REFIN/OUT+

REFIN -

CH0+

CH0-

CH1+

CH1-

Voltage VREFEXT

Reference

+

-

VREF

AVDD

DVDD

AMCLK

Clock

DMCLK/DRCLK Generation

Xtal Oscillator

MCLK

OSC1

OSC2

VREF- VREF+ ANALOG DIGITAL

DMCLK

+

-

PGA

Δ -Σ

Modulator

SINC3

DATA_CH0<23:0>

Φ

Phase PHASEA <7:0>

Shifter

OSR<1:0>

PRE<1:0>

DRA

+

-

PGA

Δ -Σ

Modulator

DUAL DS ADC

SINC3

DATA_CH1<23:0>

CH2+

CH2-

CH3+

CH3-

+

-

PGA

Δ -Σ

Modulator

+

-

PGA

Δ -Σ

Modulator

DUAL DS ADC

SINC3

DATA_CH2<23:0>

Φ

Phase

Shifter

PHASEB <7:0>

Digital SPI

Interface

DATA_CH3<23:0>

SINC3

DRB

CH4+

CH4-

CH5+

CH5-

+

-

PGA

Δ -Σ

Modulator

+

-

PGA

Δ -Σ

Modulator

DUAL DS ADC

SINC3

DATA_CH4<23:0>

Φ

Phase

Shifter

PHASEC <7:0>

DATA_CH5<23:0>

SINC3

DRC

SDO

RESET

SDI

SCK

CS

POR

AVDD

Monitoring

POR

AGND

DGND

DS25048B-page 2

© 2011 Microchip Technology Inc.

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