ADS1606IPAPR datasheet(6/38 Pages) TI

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ADS1605

ADS1606

SBAS274H − MARCH 2003 − REVISED MAY 2007

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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 volt-

age 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 of the output code

(LSB), 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 mini-

mum measurable input signals. 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 tem-

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

the larger of the drift from ambient (T = 25

_C) to the

minimum or maximum operating temperatures.

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.

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 ampli-

tude 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 (T =

_C) to the minimum or maximum operating tempera-

tures.

Signal-to-Noise Ratio (SNR)

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

put 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 har-

monics of the input signal but excluding the dc compo-

nent.

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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