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ADC3641 датащи(PDF) 25 Page - Texas Instruments

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номер детали ADC3641
подробное описание детали  ADC364x 14-bit, 10-MSPS to 65-MSPS, Low-Noise, Low Power Dual Channel ADC
PDF  77 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

ADC3641 датащи(HTML) 25 Page - Texas Instruments

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8.3.1.3 Auto-Zero Feature
The ADC364x 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 ADC3641/2 and can be enabled using SPI register writes for the
ADC3643 (register 0x11, D0).
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 8-9. FFT at 25 MSPS with input frequency of
3 MHz (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 8-10. FFT at 25 MSPS with input frequency
of 3 MHz (auto-zero feature enable vs disable, 4M
point FFT)
Input Frequency (MHz)
0
10
20
30
-140
-120
-100
-80
-60
-40
-20
0
adc3
AZ DIS
AZ EN
Figure 8-11. ADC3643: FFT at 65 MSPS with input
frequency of 5 MHz (auto-zero feature enable vs
disable, 4M point FFT)
Input Frequency (MHz)
0.01
0.1
1
10
100
1000
-160
-140
-120
-100
-80
adc3
Auto-zero DIS
Auto-zero EN
Figure 8-12. ADC3643: FFT at 65 MSPS with input
frequency of 5 MHz (auto-zero feature enabled vs
disabled, 4M point FFT)
www.ti.com
ADC3643
SBAS886 – OCTOBER 2020
Copyright © 2020 Texas Instruments Incorporated
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Product Folder Links: ADC3643



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