ADC3683 datasheet(41/70 Pages) TI1

Part #	ADC3683

Description	ADC3683-SP Space Grade 18-Bit 1 to 65MSPS, Low Noise, Ultra-low Power Dual Channel ADC

PDF	70 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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41 / 70 page

7.4.3 Digital Channel Averaging

The ADC3683-SP includes a digital channel averaging feature which enables improvement of the ADC dynamic

range (see Figure 7-46). The same input signal is given to both ADC inputs externally, and the output of the two

ADCs is averaged internally. By averaging, uncorrelated noise (such as, ADC thermal noise) improves 3dB while

correlated noise (such as, jitter in the clock path, reference noise) is unaffected. Therefore, the averaging gives

close to 3dB improvement at low input frequencies but less at high input frequencies where clock jitter dominates

the SNR.

The output from the digital averaging block is given out on the digital outputs of channel A, or can be routed to

the digital decimation filters using the digital mux.

ADC

NCO

MUX

AVG

ADC

External

Internal

Figure 7-46. Digital Channel Averaging Diagram

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ADC3683-SP

SBASAB5 – MARCH 2024

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ADC3683 Datasheet(PDF) 41 Page - Texas Instruments