REV. 0

AD9410

–8–

DEFINITIONS 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 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 capaci-

tance 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 on a single pin and subtract-

ing the voltage from the other pin, which is 180 degrees out of

phase. Peak-to-peak differential is computed by rotating the

inputs 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 width from an ideal 1 LSB step.

Effective Number of Bits

The effective number of bits (ENOB) is calculated from the

measured SINAD based on the equation.

ENOB

SINAD

dB

Full Scale Amplitude

Input Amplitude

MEASURED

=

+









– .

log

.

176

20

602

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

ENCODE pulse should be left in low state. See timing implica-

define an acceptable ENCODE duty cycle.

Full-Scale Input Power

Expressed in dBm. Computed using the following equation:

POWER

V

Z

FULL SCALE

FULL SCALE

INPUT

rms

=





























10

0 001

2

log

.

Harmonic Distortion, Second

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

second harmonic component, reported in dBc.

Harmonic Distortion, Third

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

third 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 a differential crossing of ENCODE and

ENCODE and the time when all output data bits are within

valid logic levels.

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.

Noise (For Any Range Within the ADC)

VZ

NOISE

FS

SIGNAL

dBm

dBFS

=×

×

−









||

.

0 001 10

10

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 0.5 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 (Without Harmonics)

The ratio of the rms signal amplitude (set at 0.5 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. May be reported in dBc

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

related back to converter full scale).

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.

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 level is lowered), or in dBFS (always

related 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.