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MCP3461RT-E/ST 데이터시트(PDF) 37 Page - Microchip Technology

부품명 MCP3461RT-E/ST
상세설명  Two/Four/Eight-Channel, 153.6 ksps, Low-Noise, 16-Bit Delta-Sigma ADCs with Internal Voltage Reference
PDF  118 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3461RT-E/ST 데이터시트(HTML) 37 Page - Microchip Technology

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 2020-2021 Microchip Technology Inc.
DS20006404C-page 37
MCP3461/2/4R
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 totally independent.
Each of these multiplexers includes the same
possibilities for the input selection, so that any required
combination of input voltages can be converted by the
ADC. The analog multiplexer is composed of parallel
low-resistance input switches, turned on or off, depend-
ing on the input channel selection. Their resistance is
negligible compared 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
VIN+ Analog Multiplexer
Sigma-Delta ADC
VIN+
VIN-
VCM
TEMP Diode P
MUX[7:4]
REFIN-
REFIN+/OUT
AVDD
AGND
CH1
CH0
MUX[3:0]
AVDD
ISOURCE
AGND
ISINK
AGND
CS_SEL[1:0]
CS_SEL[1:0]
AVDD
ITEMP+
MUX[7:4]
=
1101
REFIN-
REFIN+/OUT
AVDD
AGND
CH1
CH0
TEMP Diode M
VIN- Analog Multiplexer
VCM
TEMP Diode P
AGND
TEMP Diode M
MUX[3:0]
=
1101
AVDD
ITEMP-
MUX[7:4]
=
1110
MUX[3:0]
=
1110



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