AD7380 datasheet(15/29 Pages) AD

Part #	AD7380

Description	Differential Inputs, 1 MSPS/500 kSPS, Dual Simultaneous Sampling SAR ADCs

PDF	29 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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15 / 29 page

Data Sheet

AD4680/AD4681

Rev. 0 | Page 15 of 29

ADC TRANSFER FUNCTION

The AD4680/AD4681 can use a 2.5 V to 3.3 V VREF. The

AD4680/AD4681convert 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 (2 × 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 microvolts for different resolutions and

reference voltages options.

The ideal transfer characteristic for the AD4680/AD4681 is

shown in Figure 33.

+FSR – 1LSB

–FSR – 1LSB

–FSR

100 ... 000

011 ... 111

011 ... 110

011 ... 101

100 ... 010

100 ... 001

+FSR – 1.5LSB

–FSR – 0.5LSB

Figure 33. ADC Ideal Transfer Function (FSR = Full-Scale Range)

Table 8. LSB Size

Resolution

(Bits)

2.5 V Reference

(μV)

3.3 V Reference

(μV)

76.3

100.7

19.1

25.2

AD7380 Datasheet(PDF) 15 Page - Analog Devices