AD12400 データシートの表示（PDF） - Analog Devices

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AD12400

12-Bit, 400 MSPS A/D Converter

Analog Devices 

TERMINOLOGY

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.

Analog Input VSWR (50 Ω)

The voltage standing wave ratio (VSWR) is a ratio of the

transmitted and reflected signals. The VSWR can be related to

input impedance

Γ = (ZL − ZS)/(ZL + ZS)

where:

ZL = actual load impedance.

ZS = reference impedance.

VSWR = (1 − |Γ|)/(1 +|Γ|)

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Differential Nonlinearity

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

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.

Effective Number of Bits (ENOB)

Calculated from the measured SNR based on the equation

ENOB = SNRMEASURED − 1.76 dB

6.02

Encode Pulse Width/Duty Cycle

Pulse width high is the minimum amount of time the ENCODE

pulse should be left in Logic 1 state to achieve rated

performance; pulse width low is the minimum time the

ENCODE pulse should be left in low state.

AD12400

Full-Scale Input Power

Expressed in dBm. Computed using the following equation:

POWERFull-Scale = 10 log ((V2Full-Scalerms)/(|ZINPUT| × 0.001))

Full-Scale Input Voltage Range

The maximum peak-to-peak input signal magnitude that results

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

case. Any magnitude increase from this value results in an over-

range condition.

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.

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.

Maximum Conversion Rate

The maximum ENCODE rate at which the image spur

calibration degrades no more than 1 dB (when the image

spur is 70 dB).

Minimum Conversion Rate

The minimum ENCODE rate at which the image spur

calibration degrades no more than 1 dB (when the image

spur is 70 dB).

Offset Error

The dc offset imposed on the input signal by the ADC, reported

in LSB (codes).

Output Propagation Delay

The delay between a differential crossing of ENCODE and

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

Pipeline Latency

The number of clock cycles the output data lags the correspond-

ing clock cycle.

Power Supply Rejection Ratio (PSRR)

The ratio of power supply voltage change to the resulting ADC

output voltage change.

Rev. A | Page 9 of 24

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