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AD7761BSTZ Datasheet(PDF) 65 Page - Analog Devices

Part # AD7761BSTZ
Description  8-Channel, 16-Bit, Simultaneous Sampling ADC with Power Scaling, 110.8 kHz BW
PDF  69 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7761BSTZ Datasheet(HTML) 65 Page - Analog Devices

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Data Sheet
AD7761
Rev. 0 | Page 65 of 69
POSITIVE REFERENCE PRECHARGE BUFFER ENABLE REGISTER
Address: 0x13, Reset: 0x00, Name: Positive Reference Precharge Buffer
This register turns on or off the precharge buffers on the reference positive input to each of the ADCs from Channel 0 to Channel 7.
Table 50. Bit Descriptions for Positive Reference Precharge Buffer
Bits
Bit Name
Settings
Description
Reset
7
CH7_REFP_BUF
0
Off
0x0
1
On
6
CH6_REFP_BUF
0
Off
0x0
1
On
5
CH5_REFP_BUF
0
Off
0x0
1
On
4
CH4_REFP_BUF
0
Off
0x0
1
On
3
CH3_REFP_BUF
0
Off
0x0
1
On
2
CH2_REFP_BUF
0
Off
0x0
1
On
1
CH1_REFP_BUF
0
Off
0x0
1
On
0
CH0_REFP_BUF
0
Off
0x0
1
On
NEGATIVE REFERENCE PRECHARGE BUFFER ENABLE REGISTER
Address: 0x14, Reset: 0x00, Name: Negative Reference Precharge Buffer
This register turns on or off the precharge buffers on the reference negative input to each of the ADCs from Channel 0 to Channel 7.
Table 51. Bit Descriptions for Negative Reference Precharge Buffer
Bits
Bit Name
Settings
Description
Reset
7
CH7_REFN_BUF
0
Off
0x0
1
On
6
CH6_REFN_BUF
0
Off
0x0
1
On
5
CH5_REFN_BUF
0
Off
0x0
1
On
4
CH4_REFN_BUF
0
Off
0x0
1
On
3
CH3_REFN_BUF
0
Off
0x0
1
On
2
CH2_REFN_BUF
0
Off
0x0
1
On
1
CH1_REFN_BUF
0
Off
0x0
1
On
0
CH0_REFN_BUF
0
Off
0x0
1
On
OFFSET REGISTERS
The CHx_OFFSET_MSB, CHx_OFFSET_MID, and CHx_OFFSET_LSB registers are 24 bit, signed twos complement registers for channel
offset adjustment. If the channel gain setting is at its ideal nominal value of 0x555555, an LSB of offset register adjustment changes the digital
output by −1/192 LSBs. For example, changing the offset register from 0 to 4800 changes the digital output by −25 LSBs. Because offset
adjustment occurs before gain adjustment, the ratio of 1/192 changes linearly with gain adjustment via the CHx_GAIN_x registers. After a
reset or power cycle, the register values revert to the default factory setting.



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