ADS1601IPFBT datasheet(6/31 Pages) TI2

6 / 31 page

(AINP+AINN)

ADS1601

SBAS322D

– DECEMBER 2004 – REVISED OCTOBER 2011

www.ti.com

DEFINITIONS

Absolute Input Voltage

Intermodulation Distortion (IMD)

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

IMD, given in dB, is measured while applying two

each analog input (AINN or AINP) with respect to

input signals of the same magnitude, but with slightly

AGND.

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.

Aperture Delay

Aperture delay is the delay between the rising edge

Offset Error

of CLK and the sampling of the input signal.

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

when the differential input is zero.

Common-Mode Input Voltage

Common-mode input voltage (VCM) is the average

Offset Error Drift

voltage of the analog inputs:

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

(T = +25

°C) to the minimum or maximum operating

Differential Input Voltage

temperatures.

Differential

input

voltage

(VIN)

the

voltage

Signal-to-Noise Ratio (SNR)

difference between the analog inputs (AINP

−AINN).

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

Differential Nonlinearity (DNL)

input

signal

the

sum

all

the

frequency

components below fCLK/2 (the Nyquist frequency)

DNL, given in least-significant bits of the output code

excluding the first six harmonics of the input signal

(LSB), is the maximum deviation of the output code

and the dc component.

step sizes from the ideal value of 1LSB.

Signal-to-Noise and Distortion (SINAD)

Full-Scale Range (FSR)

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

FSR is the difference between the maximum and

the input signal to the sum of all the frequency

minimum measurable input signals (FSR = 1.88VREF).

components below fCLK/2 (the Nyquist frequency)

including the harmonics of the input signal but

Gain Error

excluding the dc component.

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

input signal with respect to the ideal value.

Spurious-Free Dynamic Range (SFDR)

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

Gain Error Drift

amplitude of the input signal to the rms amplitude of

Gain error drift, given in ppm/

°C, is the drift over

the peak spurious signal.

temperature of the gain error. The gain error is

specified as the larger of the drift from ambient

Total Harmonic Distortion (THD)

(T = 25

°C) to the minimum or maximum operating

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

temperatures.

value of the first six harmonics of the input signal to

the rms value of the input signal.

Integral Nonlinearity (INL)

INL, given in least-significant bits of the output code

(LSB), is the maximum deviation of the output codes

from a best fit line.

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