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ADC3683 датащи(PDF) 19 Page - Texas Instruments

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номер детали ADC3683
подробное описание детали  ADC3683-SP Space Grade 18-Bit 1 to 65MSPS, Low Noise, Ultra-low Power Dual Channel ADC
PDF  70 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

ADC3683 датащи(HTML) 19 Page - Texas Instruments

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7.3.1.2 Auto-Zero Feature
The ADC3683-SP includes an internal auto-zero front end amplifier circuit which improves the 1/f flicker
noise(noise near DC).
Frequency (MHz)
0
2.5
5
7.5
10
12.5
-160
-140
-120
-100
-80
-60
-40
-20
0
adc3
Auto-zero DIS
Auto-zero EN
Figure 7-6. FFT at 25MSPS with Input Frequency
of 3MHz (Auto-Zero Feature Enable vs Disable, 4M
Point FFT)
Frequency (kHz)
0.01
0.1
1
10
100
1000
-160
-150
-140
-130
-120
-110
-100
-90
-80
adc3
Auto-zero DIS
Auto-zero EN
Figure 7-7. FFT at 2 MSPS with Input Frequency
of 3MHz (Auto-Zero Feature Enable vs Disable, 4M
Point FFT) zoomed in near DC
Figure 7-8. FFT at 65MSPS with Input Frequency
of 5MHz (Auto-Zero Feature Enable vs Disable, 4M
Point FFT)
Figure 7-9. FFT at 65MSPS with Input Frequency
of 5MHz (Auto-Zero Feature Enable vs Disable, 4M
Point FFT) zoomed in near DC
Note
Auto-Zero enabled (plots on the left) does not affect AC performance as graph above shows. Auto-
Zero enabled is comparable and slightly better than when Auto-Zero is disabled. Auto-Zero enabled
(plots on the right) improves the 1/f flicker noise (noise near DC) compared to when Auto-Zero is
disabled.
www.ti.com
ADC3683-SP
SBASAB5 – MARCH 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: ADC3683-SP



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