Microchip Technology ADM00310 Data Sheet
MCP3903
DS25048B-page 2
© 2011 Microchip Technology Inc.
Functional Block Diagram
CH0+
CH0-
CH1+
CH1-
SDO
SDI
SCK
SCK
DUAL DS ADC
ANALOG DIGITAL
SINC
3
-
+
PGA
Xtal Oscillator
MCLK
OSC1
OSC2
DRA
RESET
Digital SPI
Interface
Clock
Generation
SINC
3
-
+
PGA
Modulator
AMCLK
DMCLK/DRCLK
DMCLK
Phase
Shifter
PHASEA <7:0>
OSR<1:0>
PRE<1:0>
DATA_CH0<23:0>
DATA_CH1<23:0>
CS
REFIN/OUT+
REFIN -
AV
DD
AGND
DGND
DV
DD
POR
AV
AV
DD
Monitoring
Modulator
V
REF
+
V
REF
-
VREFEXT
Voltage
Reference
V
REF
+
-
Δ -Σ
Δ -Σ
Φ
CH2+
CH2-
CH3+
CH3-
DUAL DS ADC
SINC
3
-
+
PGA
SINC
3
-
+
PGA
Modulator
Phase
Shifter
PHASEB <7:0>
DATA_CH2<23:0>
DATA_CH3<23:0>
Modulator
Δ -Σ
Δ -Σ
Φ
CH4+
CH4-
CH5+
CH5-
DUAL DS ADC
SINC
3
-
+
PGA
SINC
3
-
+
PGA
Modulator
Phase
Shifter
PHASEC <7:0>
DATA_CH4<23:0>
DATA_CH5<23:0>
Modulator
Δ -Σ
Δ -Σ
Φ
DRB
DRC
POR