AD9289

Preliminary Technical Data

Rev. PrJ | Page 8 of 16

6/25/2004

MAXIMUM CONVERSION RATE

The encode rate at which parametric testing is performed.

OFFSET ERROR

Offset error is the difference between the measured and ideal

voltage at the analog input that produces the midscale code at the

outputs. Offset error is given for the worst ADC.

OFFSET MATCHING

Expressed in mV. Computed using the following equation:

min

max

OFF

OFF

hing

OffsetMatc

−

=

most negative offset error.

OUTPUT PROPAGATION DELAY

The delay between a differential crossing of CLK+ and CLK- and

the time when all output data bits are within valid logic levels.

NOISE (FOR ANY RANGE WITHIN THE ADC)













−

−

=

10

10

*

001

.

*

dBFS

dBc

dBm

Signal

SNR

FS

noise

Z

V

Where Z is the input impedance, FS is the full scale of the device

for the frequency in question, SNR is the value for the particular

input level and Signal is the signal level within the ADC reported

in dB below full scale. This value includes both thermal and

quantization noise.

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 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 (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. It also may be reported in dBc (i.e.,

degrades as signal level is lowered) or dBFS (i.e., always related

back to converter full scale).

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. It also may be reported in dBc (i.e.,

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

back to converter full scale).

WORST OTHER SPUR

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

spurious component (excluding the second and third harmonic)

reported in dBc.

TRANSIENT RESPONSE TIME

Transient response time is defined as the time it takes for the ADC

to reacquire the analog input after a transient from 10% above

negative full scale to 10% below positive full scale.

OUT-OF-RANGE RECOVERY TIME

Out of range recovery time is the time it takes for the ADC to

reacquire the analog input after a transient from 10% above

positive full scale to 10% above negative full scale, or from 10%

below negative full scale to 10% below positive full scale.