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AD7768 Datasheet(PDF) 95 Page - Analog Devices

Part # AD7768
Description  8-/4-Channel, 24-Bit, Simultaneous Sampling ADCs with Power Scaling, 110.8 kHz BW
PDF  99 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7768 Datasheet(HTML) 95 Page - Analog Devices

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Data Sheet
AD7768/AD7768-4
Rev. A | Page 95 of 99
ANALOG INPUT PRECHARGE BUFFER ENABLE REGISTER CHANNEL 2 AND CHANNEL 3
Address: 0x12, Reset: 0xFF, Name: Precharge Buffer 2
This register turns on or off the precharge buffers on the analog inputs. When writing to these registers, the user must write the inverse of
the required bit settings. For example, to clear Bit 7 of this register, the user must write 0x01 to the register. This clears Bit 7 and sets all
other bits. If the user reads the register again after writing 0x01, the data read is 0xFE, as required.
Table 79. Bit Descriptions for Precharge Buffer 2
Bits
Bit Name
Settings
Description
Reset
3
CH3_PREBUF_NEG_EN
0
Off
0x1
1
On
2
CH3_PREBUF_POS_EN
0
Off
0x1
1
On
1
CH2_PREBUF_NEG_EN
0
Off
0x1
1
On
0
CH2_PREBUF_POS_EN
0
Off
0x1
1
On
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 3.
Table 80. Bit Descriptions for Positive Reference Precharge Buffer
Bits
Bit Name
Settings
Description
Reset
5
CH3_REFP_BUF
0
Off
0x0
1
On
4
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 3.
Table 81. Bit Descriptions for Negative Reference Precharge Buffer
Bits
Bit Name
Settings
Description
Reset
5
CH3_REFN_BUF
0
Off
0x0
1
On
4
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



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