AD10242

–6–

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.

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 compo-

nents, excluding the first five harmonics and dc.

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 compo-

nent may or may not be a harmonic. SFDR may be reported in

dBc (i.e., degrades as signal levels are lowered) or in dBFS

(always related back to converter full scale).

Transient Response

The time required for the converter to achieve 0.02% accu-

racy 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.

Two-Tone SFDR

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

the peak spurious component. The peak spurious component

may or may not be an IMD product. Two-tone SFDR may be

reported in dBc (i.e., degrades as signal levels are lowered) or

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

DEFINITION OF SPECIFICATIONS

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 the 50% point of the rising edge of the

ENCODE command and the instant at which the analog input

is sampled.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Differential Nonlinearity

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

Encode Pulsewidth/Duty Cycle

Pulsewidth high is the minimum amount of time that the

ENCODE pulse should be left in Logic “1” state to achieve rated

performance; pulsewidth low is the minimum time that the

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

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” deter-

mined 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 the 50% point of the rising edge of the ENCODE

command and the time when all output data bits are within valid

logic levels.

REV. D