ADS5294IPFPR datasheet(72/81 Pages) TI1

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(ExpressedindBc)

DVCM

DVOUT

CMRR=20Log

(ExpressedindBc)

DVSUP

DVOUT

PSRR=20Log

THD = 10Log

SINAD

1.76

ENOB =

6.02

ADS5294

SLAS776D – NOVEMBER 2011 – REVISED SEPTEMBER 2015

www.ti.com

Device Support (continued)

SINAD is either given in units of dBc (dB to carrier) when the absolute power of the

fundamental is used as the reference, or dBFS (dB to full-scale) when the power of the

fundamental is extrapolated to the converter full-scale range.

Effective Number of Bits (ENOB) ENOB is a measure of the converter performance as compared to the

theoretical limit based on quantization noise.

(9)

Total Harmonic Distortion (THD) THD is the ratio of the power of the fundamental (PS) to the power of the first

nine harmonics (PD).

(10)

THD is typically given in units of dBc (dB to carrier).

Spurious-Free Dynamic Range (SFDR) The ratio of the power of the fundamental to the highest other spectral

component (either spur or harmonic). SFDR is typically given in units of dBc (dB to carrier).

Two-Tone Intermodulation Distortion IMD3 is the ratio of the power of the fundamental (at frequencies f1 and

f2) to the power of the worst spectral component at either frequency 2f1 – f2 or 2f2 – f1. IMD3 is

either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as

the reference, or dBFS (dB to full-scale) when the power of the fundamental is extrapolated to the

converter full-scale range.

DC Power-Supply Rejection Ratio (DC PSRR) DC PSSR is the ratio of the change in offset error to a change

in analog supply voltage. The DC PSRR is typically given in units of mV/V.

AC Power-Supply Rejection Ratio (AC PSRR) AC PSRR is the measure of rejection of variations in the supply

voltage by the ADC. If

ΔVSUP is the change in supply voltage and ΔVOUT is the resultant change of

the ADC output code (referred to the input), then:

(11)

Voltage Overload Recovery The number of clock cycles taken to recover to less than 1% error after an overload

on the analog inputs. Voltage overload recovery is tested by separately applying a sine wave signal

with 6dB positive and negative overload. The deviation of the first few samples after the overload

(from the expected values) is noted.

Common-Mode Rejection Ratio (CMRR) CMRR is the measure of rejection of variation in the analog input

common-mode by the ADC. If

ΔVCM_IN is the change in the common-mode voltage of the input pins

and

ΔVOUT is the resulting change of the ADC output code (referred to the input), then:

(12)

Crosstalk (only for multi-channel ADCs) Crosstalk is a measure of the internal coupling of a signal from an

adjacent channel into the channel of interest. Crosstalk is specified separately for coupling from the

immediate neighboring channel (near-channel) and for coupling from channel across the package

(far-channel). Crosstalk is usually measured by applying a full-scale signal in the adjacent channel.

Crosstalk is the ratio of the power of the coupling signal (as measured at the output of the channel

of interest) to the power of the signal applied at the adjacent channel input. Crosstalk is typically

expressed in dBc.

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