参数资料
型号: EVAL-AD7678CBZ
厂商: Analog Devices Inc
文件页数: 3/28页
文件大小: 0K
描述: BOARD EVAL FOR AD7678
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 18
采样率(每秒): 100k
数据接口: 串行,并联
输入范围: ±VREF
在以下条件下的电源(标准): 31mW @ 100kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7678
已供物品:
AD7678
Rev. A | Page 11 of 28
DEFINITION OF SPECIFICATIONS
Integral Nonlinearity Error (INL)
Linearity error refers to the deviation of each individual code
from a line drawn from negative full scale through positive full
scale. The point used as negative full scale occurs LSB before
the first code transition. Positive full scale is defined as a level
1 LSB beyond the last code transition. The deviation is
measured from the middle of each code to the true straight line.
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. Differential
nonlinearity is the maximum deviation from this ideal value. It
is often specified in terms of resolution for which no missing
codes are guaranteed.
Gain Error
The first transition (from 000…00 to 000…01) should occur for
an analog voltage LSB above the nominal –full scale
(–4.095991 V for the ±4.096 V range). The last transition (from
111…10 to 111…11) should occur for an analog voltage
1 LSB below the nominal full scale (4.095977 V for the
±4.096 V range). The gain error is the deviation of the differ-
ence between the actual level of the last transition and the
actual level of the first transition from the difference between
the ideal levels.
Zero Error
The zero error is the difference between the ideal midscale
input voltage (0 V) from the actual voltage producing the
midscale output code.
Spurious-Free Dynamic Range (SFDR)
SFDR is the difference, in decibels (dB), between the rms
amplitude of the input signal and the peak spurious signal.
Effective Number of Bits (ENOB)
ENOB is a measurement of the resolution with a sine wave
input, and is expressed in bits. It is related to S/(N+D) by the
following formula:
ENOB = (S/[N+D]dB – 1.76)/6.02
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first five harmonic
components to the rms value of a full-scale input signal, and is
expressed in decibels.
Dynamic Range
Dynamic range is the ratio of the rms value of the full scale to
the rms noise measured with the inputs shorted together. The
value for dynamic range is expressed in decibels.
Signal-to-Noise Ratio (SNR)
SNR is the ratio of the rms value of the actual input signal to the
rms sum of all other spectral components below the Nyquist
frequency, excluding harmonics and dc. The value for SNR is
expressed in decibels.
Signal-to-(Noise + Distortion) Ratio (S/[N+D])
S/(N+D) is the ratio of the rms value of the actual input signal
to the rms sum of all other spectral components below the
Nyquist frequency, including harmonics but excluding dc. The
value for S/(N+D) is expressed in decibels.
Aperture Delay
Aperture delay is a measure of the acquisition performance and
is measured from the falling edge of the CNVST input to when
the input signal is held for a conversion.
Transient Response
Transient response is the time required for the AD7678 to
achieve its rated accuracy after a full-scale step function is
applied to its input.
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