ADS5295IPFP datasheet(83/93 Pages) TI2

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THD = 10 Log

ENOB =

SINAD

1.76

6.02

SINAD = 10 Log

P + P

SNR = 10 Log

ADS5295

www.ti.com

SBAS595 – DECEMBER 2012

DEFINITION OF SPECIFICATIONS

Analog Bandwidth: The analog input frequency at which the power of the fundamental is reduced by 3 dB with

respect to the low-frequency value.

Aperture Delay: The delay in time between the rising edge of the input sampling clock and the actual time at

which the sampling occurs. This delay is different across channels. The maximum variation is specified as

aperture delay variation (channel-to-channel).

Aperture Uncertainty (jitter): The sample-to-sample variation in aperture delay.

Clock Pulse Width (duty cycle): The duty cycle of a clock signal is the ratio of the time that the clock signal

remains at a logic high (clock pulse width) to the period of the clock signal. Duty cycle is typically expressed as a

percentage. A perfect differential sine-wave clock results in a 50% duty cycle.

Maximum Conversion Rate: The maximum sampling rate at which specified operation is given. All parametric

testing is performed at this sampling rate, unless otherwise noted.

Minimum Conversion Rate: The minimum sampling rate at which the ADC functions.

Differential Nonlinearity (DNL): An ideal ADC exhibits code transitions at analog input values spaced exactly

1 LSB apart. DNL is the deviation of any single step from this ideal value, measured in units of LSBs.

Integral Nonlinearity (INL): INL is the deviation of the ADC transfer function from a best-fit line determined by a

least-squares curve fit of that transfer function, measured in units of LSBs.

Gain Error: Gain error is the deviation of the actual ADC input full-scale range from its ideal value. The gain

error is given as a percentage of the ideal input full-scale range. Gain error has two components: error as a

result of reference inaccuracy and error as a result of the channel. Both errors are specified independently as

EGREF and EGCHAN, respectively. To a first-order approximation, the total gain error is (ETOTAL ~ EGREF + EGCHAN).

For example, if ETOTAL = ±0.5%, then the full-scale input varies from [(1 – 0.5 / 100) × FSIDEAL] to [(1 + 0.5 / 100)

× FSIDEAL].

Offset Error: Offset error is the difference, given in number of LSBs, between the actual average ADC idle

channel output code and the ideal average idle channel output code. This quantity is often mapped into millivolts.

Temperature Drift: The temperature drift coefficient (with respect to gain error and offset error) specifies the

change per degree Celsius of the parameter from TMIN to TMAX. Drift is calculated by dividing the maximum

deviation of the parameter across the TMIN to TMAX range by the difference of TMAX – TMIN.

Signal-to-Noise Ratio (SNR): SNR is the ratio of the power of the fundamental (PS) to the noise floor power

(PN), excluding the power at dc and the first nine harmonics. SNR 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.

(8)

Signal-to-Noise and Distortion (SINAD): SINAD is the ratio of the power of the fundamental (PS) to the power

of all the other spectral components, including noise (PN) and distortion (PD), but excluding dc. 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.

(9)

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

theoretical limit based on quantization noise.

(10)

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

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

(11)

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