ADS5400IPZP datasheet(41/48 Pages) TI

41 / 48 page

SNR + 10log10

ADS5400

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SLAS611B – OCT 2009 – REVISED MARCH 2010

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

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay

Clock Pulse Duration/Duty Cycle

The duty cycle of a clock signal is the ratio of the time the clock signal remains at a logic high (clock pulse

duration) to the period of the clock signal, expressed as a percentage.

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 LSB.

Common-Mode Rejection Ratio (CMRR)

CMRR measures the ability to reject signals that are presented to both analog inputs simultaneously. The

injected common-mode frequency level is translated into dBFS, the spur in the output FFT is measured in dBFS,

and the difference is the CMRR in dB.

Effective Number of Bits (ENOB)

ENOB is a measure in units of bits of a converter's performance as compared to the theoretical limit based on

quantization noise

ENOB = (SINAD – 1.76)/6.02

(3)

Gain Error

Gain error is the deviation of the ADC actual input full-scale range from its ideal value, given as a percentage of

the ideal input full-scale range.

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. The INL at each analog input value is the difference between the actual transfer function and

this best-fit line, measured in units of LSB.

Offset Error

Offset error is the deviation of output code from mid-code when both inputs are tied to common-mode.

Power-Supply Rejection Ratio (PSRR)

PSRR is a measure of the ability to reject frequencies present on the power supply. The injected frequency level

is translated into dBFS, the spur in the output FFT is measured in dBFS, and the difference is the PSRR in dB.

The measurement calibrates out the benefit of the board supply decoupling capacitors.

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 in the first five harmonics.

(4)

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’s

full-scale range.

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