AD13280SLASHPCB datasheet(12/28 Pages) AD

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AD13280

Rev. C | Page 12 of 28

TERMINOLOGY

Analog Bandwidth

The analog input frequency at which the spectral power of the

fundamental frequency (as determined by the FFT analysis) is

reduced by 3 dB.

Aperture Delay

The delay between a differential crossing of the ENCODEA

signal and the ENCODEA signal and the instant at which the

analog input is sampled.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Differential Analog Input Resistance, Differential Analog

Input Capacitance, and Differential Analog Input Impedance

The real and complex impedances measured at each analog

input port. The resistance is measured statically, and the

capacitance and differential input impedances are measured

with a network analyzer.

Differential Analog Input Voltage Range

The peak-to-peak differential voltage that must be applied to

the converter to generate a full-scale response. Peak differential

voltage is computed by observing the voltage from the other

pin, which is 180 degrees out of phase. Peak-to-peak differential

is computed by rotating the input phase 180 degrees and taking

the peak measurement again. The difference is then computed

between both peak measurements.

Differential Nonlinearity

The deviation of any code from an ideal 1 LSB step.

ENCODE Pulse Width/Duty Cycle

Pulse width high is the minimum amount of time that the

ENCODE pulse should be left in a Logic 1 state to achieve the

rated performance. Pulse width low is the minimum time the

ENCODE pulse should be left in a low state. At a given clock

rate, these specifications define an acceptable encode duty cycle.

Harmonic Distortion

The ratio of the rms signal amplitude to the rms value of the

worst harmonic component.

Integral Nonlinearity

The deviation of the transfer function from a reference line

measured in fractions of 1 LSB using a best straight line

determined by a least square curve fit.

Minimum Conversion Rate

The encode rate at which the SNR of the lowest analog signal

frequency drops by no more than 3 dB below the guaranteed

limit.

Maximum Conversion Rate

The encode rate at which parametric testing is performed.

Output Propagation Delay

The delay between a differential crossing of the ENCODEA

signal and the ENCODEA signal and the time at which all

output data bits are within valid logic levels.

Overvoltage Recovery Time

The amount of time required for the converter to recover to

0.02% accuracy after an analog input signal of the specified

percentage of full scale is reduced to midscale.

Power Supply Rejection Ratio

The ratio of a change in input offset voltage to a change in

power supply voltage.

Signal-to-Noise-and-Distortion (SINAD)

The ratio of the rms signal amplitude (set at 1 dB below full

scale) to the rms value of the sum of all other spectral compo-

nents, including harmonics but excluding dc. SINAD can be

reported in dB (that is, degrades as signal level is lowered) or

in dBFS (always related back to converter full scale).

Signal-to-Noise Ratio (SNR) (Without Harmonics)

The ratio of the rms signal amplitude (set at 1 dB below full

scale) to the rms value of the sum of all other spectral com-

ponents, excluding the first five harmonics and dc. SNR can be

reported in dB (that is, degrades as signal level is lowered) or

in dBFS (always related back to converter full scale).

Spurious-Free Dynamic Range (SFDR)

The ratio of the rms signal amplitude to the rms value of

the peak spurious spectral component. The peak spurious

component may or may not be a harmonic.

Transient Response

The time required for the converter to achieve 0.02% accuracy

when a one-half full-scale step function is applied to the analog

input.

Two-Tone Intermodulation Distortion Rejection

The ratio of the rms value of either input tone to the rms value

of the worst third-order intermodulation product; reported in

dBc.

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