AD4680 datasheet(16/33 Pages) AD

部件名	AD4680

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

PDF	33 Pages

Scroll/Zoom	100%

制造商	AD [Analog Devices]

网页	http://www.analog.com

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16 / 33 page

Data Sheet

AD7383-4/AD7384-4

THEORY OF OPERATION

analog.com

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

AD4680 数据表(PDF) 16 Page - Analog Devices