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ADC3683 Datasheet(PDF) 32 Page - Texas Instruments

Part # ADC3683
Description  ADC368x 18-bit 0.5 to 65-MSPS Low Noise Ultra-low Power Dual Channel ADC
PDF  91 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

ADC3683 Datasheet(HTML) 32 Page - Texas Instruments

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8.3.1.3 Auto-Zero Feature
The ADC368x includes an internal auto-zero front end amplifier circuit which improves the 1/f flicker noise. This
auto-zero feature is enabled by default for the ADC3681/2 and can be enabled using SPI register writes for the
ADC3683 (register 0x11, D0). The 4M point FFTs below show the autozero feature enabled vs disabled.
Input Frequency (MHz)
0
1
2
3
4
5
-140
-120
-100
-80
-60
-40
-20
0
Auto-zero DIS
Auto-zero EN
Figure 8-8. FS = 10 MSPS, FIN = 1.1 MHz
Frequency (kHz)
0.01
0.1
1
10
100
-160
-150
-140
-130
-120
-110
-100
-90
-80
Auto-zero DIS
Auto-zero EN
Figure 8-9. FS = 10 MSPS, FIN = 1.1 MHz
Input Frequency (MHz)
0
2.5
5
7.5
10
12.5
-140
-120
-100
-80
-60
-40
-20
0
Auto-zero DIS
Auto-zero EN
Figure 8-10. FS = 25 MSPS, FIN = 1.1 MHz
Frequency (kHz)
0.01
0.1
1
10
100
-160
-150
-140
-130
-120
-110
-100
-90
-80
Auto-zero DIS
Auto-zero EN
Figure 8-11. FS = 25 MSPS, FIN = 1.1 MHz
Figure 8-12. FS = 65 MSPS, FIN = 5 MHz
Figure 8-13. FS = 65 MSPS, FIN = 5 MHz
ADC3681, ADC3682, ADC3683
SBAS872B – DECEMBER 2020 – REVISED OCTOBER 2022
www.ti.com
32
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: ADC3681 ADC3682 ADC3683



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