AD7171(Rev0) Просмотр технического описания (PDF) - Analog Devices

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AD7171
(Rev.:Rev0)

16-Bit Low Power Sigma-Delta ADC

Analog Devices 

AD7171

OUTPUT NOISE AND RESOLUTION SPECIFICATIONS

Table 6 shows the rms noise of the AD7171. The numbers given

are for a 5 V and a 3 V reference. These numbers are typical and

are generated with a differential input voltage of 0 V. The corres-

ponding p-p resolution is also listed along with the effective

resolution (ENOB). It is important to note that the effective

resolution is calculated using the rms noise, whereas the p-p

resolution is based on the p-p noise. The p-p resolution

represents the resolution for which there is no code flicker.

These numbers are typical.

The effective number of bits (ENOB) is defined as

The noise-free bits, or p-p resolution, are defined as

Noise-Free Bits = ln (FSR/Peak-to-Peak Noise)/ln(2)

where FSR is the full-scale range and is equal to 2 × VREF/gain.

Table 6. RMS Noise and Resolution of the AD7171

P-P

VREF = VDD RMS Noise P-P Noise Resolution ENOB

5V

11.5 μV

76 μV

16 bits

16 bits

3V

6.9 μV

45 μV

16 bits

16 bits

ENOB = ln (FSR/RMS noise)/ln(2)

Rev. 0 | Page 9 of 16

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