參數(shù)資料
型號(hào)： AD9786-EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 4/56頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9786
產(chǎn)品培訓(xùn)模塊： DAC Architectures
標(biāo)準(zhǔn)包裝： 1
系列： TxDAC+®
DAC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 500M
數(shù)據(jù)接口： 并聯(lián)
DAC 型： 電流
工作溫度： -40°C ~ 85°C
已供物品： 板，CD
已用 IC / 零件： AD9786
AD9786
Rev. B | Page 12 of 56
TERMINOLOGY
Linearity Error (Integral Nonlinearity or INL)
Linearity error is defined as the maximum deviation of the
actual analog output from the ideal output, determined by a
straight line drawn from zero to full scale.
Differential Nonlinearity (DNL)
DNL is the measure of the variation in analog value, normal-
ized to full scale, associated with a 1 LSB change in digital
input code.
Monotonicity
A D/A converter is monotonic if the output either increases or
remains constant as the digital input increases.
Offset Error
The deviation of the output current from the ideal of zero is
called offset error. For IOUTA, 0 mA output is expected when the
inputs are all 0s. For IOUTB, 0 mA output is expected when all
inputs are set to 1.
Gain Error
The difference between the actual and ideal output span. The
actual span is determined by the output when all inputs are set
to 1, minus the output when all inputs are set to 0.
Output Compliance Range
The range of allowable voltage at the output of a current-output
DAC. Operation beyond the maximum compliance limits can
cause either output stage saturation or breakdown, resulting in
nonlinear performance.
Temperature Drift
Temperature drift is specified as the maximum change from the
ambient (+25°C) value to the value at either TMIN or TMAX. For
offset and gain drift, the drift is reported in ppm of full-scale
range (FSR) per degree Celsius. For reference drift, the drift is
reported in ppm per degree Celsius.
Power Supply Rejection
The maximum change in the full-scale output as the supplies
are varied from minimum to maximum specified voltages.
Settling Time
The time required for the output to reach and remain within a
specified error band about its final value, measured from the
start of the output transition.
Glitch Impulse
Asymmetrical switching times in a DAC give rise to undesired
output transients that are quantified by a glitch impulse. It is
specified as the net area of the glitch in pV-sec.
Spurious-Free Dynamic Range (SFDR)
The difference between the rms amplitude of the output signal
and the amplitude of the peak spurious signal over the specified
bandwidth. The units are often in dBc (dB with respect to the
carrier).
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first six harmonic
components to the rms value of the measured fundamental. It is
expressed as a percentage or in decibels.
Signal-to-Noise Ratio (SNR)
SNR is the ratio of the rms value of the measured output signal
to the rms sum of all other spectral components below the
Nyquist frequency, excluding the first six harmonics and dc.
The value for SNR is expressed in decibels.
Interpolation Filter
If the digital inputs to the DAC are sampled at a multiple rate of
fDATA (interpolation rate), a digital filter can be constructed that has
a sharp transition band near fDATA/2. Images that would typically
appear around fDAC (output data rate) can be greatly suppressed.
Pass Band
Frequency band in which any input applied therein passes
unattenuated to the DAC output.
Stop-Band Rejection
The amount of attenuation of a frequency outside the pass band
applied to the DAC, relative to a full-scale signal applied at the
DAC input within the pass band.
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