AD9042

–6–

REV. A

Harmonic Distortion

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

worst harmonic component, reported in dBc.

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 the 50% point of the rising edge of ENCODE

command and the time when 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 150% 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

components, including harmonics but excluding dc.

Signal-to-Noise Ratio (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

components, excluding the first five harmonics and dc.

Spurious-Free Dynamic Range

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. May be reported in

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

(always related back to converter full scale).

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.

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. May be reported in dBc

(i.e., degrades as signal levels is lowered), or in dBFS (always

related back to converter full scale).

DIE LAYOUT AND MECHANICAL INFORMATION

Die Dimensions . . . . . . . . . . . . . . . . 155

× 168 × 21 (±1) mils

Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

× 4 mils

Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum

Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None

Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GND

Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,605

Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride

Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver Filled

Bond Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold

DIE LAYOUT W/PAD LABELS

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 Pulse Width/Duty Cycle

Pulse width high is the minimum amount of time that the

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

rated performance; pulse width low is the minimum time

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

rate, these specs define an acceptable Encode duty cycle.