AD12400SLASHKIT datasheet(11/28 Pages) AD

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AD12400

Rev. 0 | Page 11 of 28

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 on 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.

Full-Scale Input Voltage Range

This is the maximum peak-to-peak input signal magnitude that

will result in a full-scale response, 0 dBFS on a single-tone input

signal case. Any magnitude increase from this value will result

in an over-range condition.

Analog Input VSWR (50 Ω)

The Voltage Standing Wave Ratio is a ratio of the transmitted

and reflected signals. The VSWR can be related to input

impedance using the following equations:

Impedance

Reference

Impedance

Load

Actual

−

VSWR

Differential Nonlinearity

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

Effective Number of Bits (ENOB)

Calculated from the measured SNR based on the equation

SNR

ENOB

MEASURED −

Encode Pulsewidth/Duty Cycle

Pulsewidth high is the minimum amount of time the ENCODE

pulse should be left in Logic 1 state to achieve rated perform-

ance; pulsewidth low is the minimum time the ENCODE pulse

should be left in low state. See timing implications of changing

tENCH in the Application Notes, Encode Input section. At a

specified clock rate of 400 MSPS, these specifications define an

acceptable ENCODE duty cycle.

Full-Scale Input Power

Expressed in dBm. Computed using the following equation:

() ⎟

⎟

⎠

⎞

⎜

⎝

⎛

−

001

log

INPUT

SCALErms

FULL

SCALE

FULL

POWER

Gain Error

The difference between the measured and ideal full-scale input

voltage range of the ADC.

Harmonic Distortion, Second

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

second harmonic component, reported in dBFS.

Harmonic Distortion, Third

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

third harmonic component, reported in dBFS.

Distortion, Image Spur

The ratio of the RMS signal amplitude to the RMS signal

amplitude of the image spur, reported in dBFS. The image spur,

a result of gain and phase errors between two time-interleaved

conversion channels, is located at fs/2 – fAIN.

Distortion, Offset Spur

The ratio of the RMS signal amplitude to the RMS signal

amplitude of the offset spur, reported in dBFS. The offset spur, a

result of offset errors between two time-interleaved conversion

channels, is located at fs/2.

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 minimum ENCODE rate at which the image spur

calibration will degrade no more than 1 dB (when image

spur is 70 dB).

Maximum Conversion Rate

The maximum ENCODE rate at which the image spur

calibration will degrade no more than 1 dB (when image

spur is 70 dB).

Output Propagation Delay

The delay between a differential crossing of ENCODE and

ENCODE (or zero crossing of a single-ended ENCODE).

Total Noise

Calculated as follows:

⎟

⎠

⎞

⎜

⎝

⎛

−

001

dBFS

dBc

dBm

SIGNAL

SNR

NOISE

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

for the frequency in question, SNR is the value of 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.

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