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ADC3421 Datasheet(PDF) 59 Page - Texas Instruments

Part # ADC3421
Description  ADC342x Quad-Channel, 12-Bit, 25-MSPS to 125-MSPS, Analog-to-Digital Converter
PDF  80 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

ADC3421 Datasheet(HTML) 59 Page - Texas Instruments

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ADC3421, ADC3422, ADC3423, ADC3424
www.ti.com
SBAS673A – JULY 2014 – REVISED OCTOBER 2015
9.6.1.15 Register 27h (address = 27h)
Figure 161. Register 27h
7
6
5
4
3
2
1
0
CLK DIV
0
0
0
0
0
0
R/W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 24. Register 27h Field Descriptions
Bit
Field
Type
Reset
Description
7-6
CLK DIV
R/W
0h
These bits select the internal clock divider for the input sampling
clock.
00 = Divide-by-1
01 = Divide-by-1
10 = Divide-by-2
11 = Divide-by-4
5-0
0
W
0h
Must write 0.
9.6.1.16 Register 11Dh (address = 11Dh)
Figure 162. Register 11Dh
7
6
5
4
3
2
1
0
0
0
0
0
0
0
HIGH IF MODE0
0
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
R/W-0h
W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 25. Register 11Dh Field Descriptions
Bit
Field
Type
Reset
Description
7-2
0
W
0h
Must write 0.
1
HIGH IF MODE0
Set the HIGH IF MODE[7:0] bits together to 1111.
Improves HD3 by a couple of dB for IF > 100 MHz.
0
0
W
0h
Must write 0.
9.6.1.17 Register 122h (address = 122h)
Figure 163. Register 122h
7
6
5
4
3
2
1
0
0
0
0
0
0
0
DIS CHOP CHA
0
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
R/W-0h
W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 26. Register 122h Field Descriptions
Bit
Field
Type
Reset
Description
7-2
0
W
0h
Must write 0.
1
DIS CHOP CHA
R/W
0h
This bit disables the chopper.
Set this bit to shift the 1/f noise floor at dc.
0 = 1/f noise floor is centered at fS / 2 (default)
1 = Chopper mechanism is disabled; 1/f noise floor is centered
at dc
0
0
W
0h
Must write 0.
Copyright © 2014–2015, Texas Instruments Incorporated
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Product Folder Links: ADC3421 ADC3422 ADC3423 ADC3424



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