AD7763BSVZ-REEL datasheet(10/32 Pages) AD

Part #	AD7763BSVZ-REEL

Description	24-Bit, 625 kSPS, 109 dB 誇-? ADC with On-Chip Buffers, Serial Interface

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AD7763

Rev. 0 | Page 10 of 32

TERMINOLOGY

Signal-to-Noise Ratio (SNR)

The ratio of the rms value of the actual input signal to the rms

sum of all other spectral components below the Nyquist fre-

quency, excluding harmonics and dc. The value for SNR is

expressed in decibels.

Total Harmonic Distortion (THD)

The ratio of the rms sum of harmonics to the fundamental. For

the AD7763, it is defined as

()

1

6

5

4

3

2

V

THD

2

log

20

dB

+

=

where:

V1

is the rms amplitude of the fundamental.

V2

, V3, V4, V5, and V6 are the rms amplitudes of the second

to the sixth harmonic.

Nonharmonic Spurious-Free Dynamic Range (SFDR)

The ratio of the rms signal amplitude to the rms value of the

peak spurious spectral component, excluding harmonics.

Dynamic Range

The ratio of the rms value of the full scale to the rms noise

measured with the inputs shorted together. The value for

dynamic range is expressed in decibels.

Integral Nonlinearity (INL)

The maximum deviation from a straight line passing through

the endpoints of the ADC transfer function.

Differential Nonlinearity (DNL)

The difference between the measured and the ideal 1 LSB

change between any two adjacent codes in the ADC.

Zero Error

The difference between the ideal midscale input voltage (0 V)

and the actual voltage producing the midscale output code.

Zero Error Drift

The change in the actual zero error value due to a temperature

change of 1°C. It is expressed as a percentage of full scale at room

temperature.

Gain Error

The first transition (from 100…000 to 100…001) should occur

for an analog voltage 1/2 LSB above the nominal negative full

scale. The last transition (from 011…110 to 011…111) should

occur for an analog voltage 1 1/2 LSB below the nominal full

scale. The gain error is the deviation of the difference between

the actual level of the last transition and the actual level of the

first transition, from the difference between the ideal levels.

Gain Error Drift

The change in the actual gain error value due to a temperature

change of 1°C. It is expressed as a percentage of full scale at

room temperature.

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AD7763BSVZ-REEL Datasheet(PDF) 10 Page - Analog Devices

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