ADC3683 datasheet(19/70 Pages) TI1

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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)

2.5

7.5

12.5

-160

-140

-120

-100

-80

-60

-40

-20

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

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.

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ADC3683-SP

SBASAB5 – MARCH 2024

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