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AD7761 Datasheet(PDF) 74 Page - Analog Devices

Part # AD7761
Description  8-Channel, 16-Bit, Simultaneous Sampling ADC with Power Scaling, 110.8 kHz BW
PDF  76 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7761 Datasheet(HTML) 74 Page - Analog Devices

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Data Sheet
AD7761
Rev. A | Page 73 of 75
Bits
Bit Name
Settings
Description
Reset
Access
5
CH5_RX
Channel 5
0x0
RW
0
Not in use
1
Receive
4
CH4_RX
Channel 4
0x0
RW
0
Not in use
1
Receive
3
CH3_RX
Channel 3
0x0
RW
0
Not in use
1
Receive
2
CH2_RX
Channel 2
0x0
RW
0
Not in use
1
Receive
1
CH1_RX
Channel 1
0x0
RW
0
Not in use
1
Receive
0
CH0_RX
Channel 0
0x0
RW
0
Not in use
1
Receive
ADC DIAGNOSTIC CONTROL REGISTER
Address: 0x57, Reset: 0x00, Name: Diagnostic Mux Control
The AD7761 ADC diagnostic allows the user to select a zero-scale, positive full-scale, or negative full-scale input to the ADC, which can
be converted to verify the correct operation of the ADC channel. This register controls the voltage that is applied to each of the ADC
channels for the diagnostic. There are three input voltage options that the user can select. The voltage selected is mapped to the channels based
on the mode (Channel Mode A or Channel Mode B) they belong to, which is set according to the channel mode select register (Register 0x03).
Set Bits[7:0] to 1 in the ADC diagnostic receive select register, then select the voltage check desired for the channels on Channel Mode A
and the channels on Channel Mode B through Bits[2:0] and Bits[6:4], respectively.
Table 56. Bit Descriptions for Diagnostic Mux Control
Bits
Bit Name
Settings
Description
Reset
Access
[6:4]
GRPB_SEL
Mux B.
0x0
RW
000
Off.
011
Positive full-scale ADC check. A voltage close to positive full scale is applied internally to
the ADC channel.
100
Negative full-scale ADC check. A voltage close to negative (or minus) full scale is applied
internally to the ADC channel.
101
Zero-scale ADC check. A voltage close to 0 V is applied internally to the ADC channel.
[2:0]
GRPA_SEL
Mux A.
0x0
RW
000
Off.
011
Positive full-scale ADC check. A voltage close to positive full scale is applied internally to
the ADC channel.
100
Negative full-scale ADC check. A voltage close to negative (or minus) full scale is applied
internally to the ADC channel.
101
Zero-scale ADC check. A voltage close to 0 V is applied internally to the ADC channel.



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