ADS1625IPAPR datasheet(6/37 Pages) TI

6 / 37 page

ADS1625

ADS1626

SBAS280E − JUNE 2003 − REVISED MAY 2007

www.ti.com

DEFINITIONS

Absolute Input Voltage

Absolute input voltage, given in volts, is the voltage of each

analog input (AINN or AINP) with respect to AGND.

Aperture Delay

Aperture delay is the delay between the rising edge of CLK

and the sampling of the input signal.

Common-Mode Input Voltage

Common-mode input voltage (VCM) is the average voltage

of the analog inputs:

(AINP

) AINN)

Differential Input Voltage

Differential input voltage (VIN) is the voltage difference

between the analog inputs: (AINP−AINN).

Differential Nonlinearity (DNL)

DNL, given in least-significant bits (LSB) of the output

code, is the maximum deviation of the output code step

sizes from the ideal value of 1LSB.

Full-Scale Range (FSR)

FSR is the difference between the maximum and minimum

measurable

input

signals.

For

the

ADS1625,

FSR = 2

× 1.467VREF.

Gain Error

Gain error, given in %, is the error of the full-scale input

signal with respect to the ideal value.

Gain Error Drift

Gain error drift, given in ppm/

_C, is the drift over

temperature of the gain error. The gain error is specified as

the larger of the drift from ambient (TA = 25_C) to the

minimum or maximum operating temperatures.

Integral Nonlinearity (INL)

INL, given in least significant bits (LSB) of the output code,

is the maximum deviation of the output codes from a best-

fit line.

Intermodulation Distortion (IMD)

IMD, given in dB, is measured while applying two input

signals of the same magnitude, but with slightly different

frequencies. It is calculated as the difference between the

rms amplitude of the input signal to the rms amplitude of

the peak spurious signal.

Offset Error

Offset Error, given in % of FSR, is the output reading when

the differential input is zero.

Offset Error Drift

Offset error drift, given in ppm of FSR/

_C, is the drift over

temperature of the offset error. The offset error is specified

as the larger of the drift from ambient (TA = 25_C) to the

minimum or maximum operating temperatures.

Signal-to-Noise Ratio (SNR)

SNR, given in dB, is the ratio of the rms value of the input

signal to the sum of all the frequency components below

fCLK/2 (the Nyquist frequency) excluding the first six

harmonics of the input signal and the dc component.

Signal-to-Noise and Distortion (SINAD)

SINAD, given in dB, is the ratio of the rms value of the input

signal to the sum of all the frequency components below

fCLK/2 (the Nyquist frequency) including the harmonics of

the input signal but excluding the dc component.

Spurious Free Dynamic Range (SFDR)

SFDR, given in dB, is the difference between the rms

amplitude of the input signal to the rms amplitude of the

peak spurious signal.

Total Harmonic Distortion (THD)

THD, given in dB, is the ratio of the sum of the rms value

of the first six harmonics of the input signal to the rms value

of the input signal.

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