AD4682 datasheet(15/30 Pages) AD

Part #	AD4682

Description	Pseudo Differential Input, 1 MSPS/500 kSPS, Dual, Simultaneous Sampling, 16-Bit, SAR ADCs

PDF	30 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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15 / 30 page

Data Sheet

AD4682/AD4683

Rev. 0 | Page 15 of 30

ADC TRANSFER FUNCTION

The AD4682 and the AD4683 can use a typical 2.5 V to 3.3 V VREF.

The AD4682 and the AD4683 convert the differential voltage of

the analog inputs (AINA+, AINA−, AINB+, and AINB−) into a

digital output.

The conversion result is MSB first, twos complement. The LSB

size is VREF/2N, where N is the ADC resolution. The ADC

resolution is determined by the resolution of the device chosen,

and if resolution boost mode is enabled. Table 8 outlines the LSB

size expressed in µV for different resolutions and reference

voltage options.

The ideal transfer characteristics for the AD4682 and the

AD4683 are shown in Figure 34.

100...010

011...111

ANALOG INPUT

+FSR – 1.5LSB

+FSR – 1LSB

–FSR + 1LSB

–FSR

–FSR + 0.5LSB

011...110

011...101

100...001

100...000

Figure 34. ADC Ideal Transfer Function (FSR = Full-Scale Range)

Table 8. LSB Size

Resolution (Bits)

2.5 V Reference (µV)

3.3 V Reference (µV)

38.1

50.3

9.5

12.6

AD4682 Datasheet(PDF) 15 Page - Analog Devices