AD9761ARS datasheet(7/23 Pages) AD

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AD9761

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REV. A

DEFINITIONS OF SPECIFICATIONS

Linearity Error (Also Called Integral Nonlinearity or INL)

Linearity error is defined as the maximum deviation of the

actual analog output from the ideal output, determined by a

straight line drawn from zero to full scale.

Differential Nonlinearity (or DNL)

DNL is the measure of the variation in analog value, normalized

to full scale, associated with a 1 LSB change in digital input

code.

Monotonicity

A D/A converter is monotonic if the output either increases or

remains constant as the digital input increases.

Offset Error

The deviation of the output current from the ideal of zero is

called offset error. For IOUTA, 0 mA output is expected when

the inputs are all 0s. For IOUTB, 0 mA output is expected

when all inputs are set to 1s.

Gain Error

The difference between the actual and ideal output span. The

actual span is determined by the output when all inputs are set

to 1s minus the output when all inputs are set to 0s.

Output Compliance Range

The range of allowable voltage at the output of a current-output

DAC. Operation beyond the maximum compliance limits may

cause either output stage saturation or breakdown, resulting in

nonlinear performance.

Temperature Drift

Temperature drift is specified as the maximum change from the

ambient (+25

°C) value to the value at either T

MIN or TMAX. For

offset and gain drift, the drift is reported in ppm of full-scale

range (FSR) per

°C. For reference drift, the drift is reported in

ppm per

°C.

Power Supply Rejection

The maximum change in the full-scale output as the supplies

are varied from nominal to minimum and maximum specified

voltages.

Settling Time

The time required for the output to reach and remain within a

specified error band about its final value, measured from the

start of the output transition.

Glitch Impulse

Asymmetrical switching times in a DAC give rise to undesired

output transients that are quantified by a glitch impulse. It is

specified the net area of the glitch in pV-s.

Channel Isolation

Channel Isolation is a measure of the level of crosstalk between

channels. It is measured by producing a full-scale 8 MHz signal

output for one channel and measuring the leakage into the other

channel.

Spurious-Free Dynamic Range

The difference, in dB, between the rms amplitude of the output

signal and the peak spurious signal over the specified bandwidth.

Total Harmonic Distortion

THD is the ratio of the sum of the rms value of the first six

harmonic components to the rms value of the measured output

signal. It is expressed as a percentage or in decibels (dB).

Signal-to-Noise and Distortion (S/N+D, SINAD) Ratio

S/N+D is the ratio of the rms value of the measured output

signal to the rms sum of all other spectral components below the

Nyquist frequency, including harmonics but excluding dc. The

value for S/N+D is expressed in decibels.

Effective Number of Bits (ENOB)

For a sine wave, SINAD can be expressed in terms of the num-

ber of bits. Using the following formula,

N = (SINAD – 1.76)/6.02

it is possible to get a measure of performance expressed as N,

the effective number of bits.

Thus, effective number of bits for a device for sine wave inputs

at a given input frequency can be calculated directly from its

measured SINAD.

Passband

Frequency band in which any input applied therein passes

unattenuated to the DAC output.

Stopband Rejection

The amount of attenuation of a frequency outside the passband

applied to the DAC, relative to a full-scale signal applied at the

DAC input within the passband.

Group Delay

Number of input clocks between an impulse applied at the

device input and peak DAC output current.

Impulse Response

Response of the device to an impulse applied to the input.

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