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MCP3462 Datasheet(PDF) 31 Page - Microchip Technology

Part # MCP3462
Description  Two/Four/Eight-Channel, 153.6 ksps, Low Noise, 16-Bit Delta-Sigma ADC
PDF  108 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3462 Datasheet(HTML) 31 Page - Microchip Technology

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 2019-2021 Microchip Technology Inc.
DS20006180D-page 31
MCP3461/2/4
5.0
DEVICE OVERVIEW
5.1
Analog Input Multiplexer
The device includes a fully configurable analog input
dual multiplexer that can select which input is con-
nected to each of the two differential input pins
(VIN+/VIN-) of the Delta-Sigma ADC.
The dual multiplexer is divided into two single-ended
multiplexers that are completely independent. Each of
these multiplexers include the same possibilities for the
input selection, so that any required combination of
input voltages can be converted by the ADC. The ana-
log multiplexer is composed of parallel low-resistance
input switches, turned on or off, depending on the input
channel selection. Their resistance is negligible com-
pared to the input impedance of the ADC (caused by
the charge and discharge of the input sampling
capacitors on the VIN+/VIN- ADC inputs). The block
diagram of the analog multiplexer is shown in
Figure 5-1.
FIGURE 5-1:
Simplified Analog Input Multiplexer Schematic.
Analog Input Dual Multiplexer
V
IN
+ Analog Multiplexer
Delta-Sigma ADC
V
IN
+
V
IN
-
VCM
TEMP Diode P
MUX[7:4]
REFIN-
REFIN+
AVDD
AGND
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
MUX[3:0]
AVDD
ISOURCE
AGND
ISINK
AGND
CS_SEL[1:0]
CS_SEL[1:0]
AVDD
I
TEMP
+
MUX[7:4]
=
1101
REFIN-
REFIN+
AVDD
AGND
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
TEMP Diode M
V
IN
- Analog Multiplexer
VCM
TEMP Diode P
AGND
TEMP Diode M
MUX[3:0]
=
1101
AVDD
I
TEMP
-
MUX[7:4]
=
1110
MUX[3:0]
=
1110



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