AD7380 datasheet(16/33 Pages) AD

Part #	AD7380

Description	Pseudo Differential Input, Quad, 4 MSPS Simultaneous Sampling, 16-Bit/14-Bit, SAR ADC

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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16 / 33 page

Data Sheet

AD7383-4/AD7384-4

THEORY OF OPERATION

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Rev. 0 | 16 of 33

ADC TRANSFER FUNCTION

The AD7383-4/AD7384-4 use a 2.5 V to 3.3 V reference voltage.

The AD7383-4/AD7384-4 convert the differential voltage of the

analog inputs (AINA+ and AINA−, AINB+ and AINB−, AINC+ and

AINC−, and AIND+ and AIND−) 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 10 outlines the LSB size expressed in

microvolts for different resolutions and reference voltage options.

The ideal transfer characteristic of the AD7383-4/AD7384-4 is

shown in Figure 27.

Figure 27. ADC Ideal Transfer Function (FSR = Full-Scale Range)

Table 10. LSB Size

Resolution (Bits)

2.5 V Reference (µV)

3.3 V Reference (µV)

152.6

201.4

38.1

50.3

9.53

12.6

AD7380 Datasheet(PDF) 16 Page - Analog Devices