ADS5294 datasheet(59/67 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

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SLAS776B – NOVEMBER 2011 – REVISED JULY 2012

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. This 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) – This is a measure of the internal coupling of a signal from an

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

neighboring channel (near-channel) and for coupling from channel across the package (far-channel). It 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. It is typically expressed in dBc.

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