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參數(shù)資料
| 型號(hào)： | AD7944BCPZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14B 2.5MSPS PULSR 20LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 系列： | PulSAR® |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 2.5M |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 33mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個(gè)偽差分，單極 |
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AD7944
Rev. A | Page 12 of 28
TERMINOLOGY
Aperture Delay
Aperture delay is the measure of the acquisition performance. It
is the time between the rising edge of the CNV input and when
the input signal is held for a conversion.
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. DNL is the
maximum deviation from this ideal value. It is often specified in
terms of resolution for which no missing codes are guaranteed.
Dynamic Range
Dynamic range is the ratio of the rms value of the full scale to
the total rms noise measured with the inputs shorted together.
The value for dynamic range is expressed in decibels. It is mea-
sured with a signal at 60 dBFS so that it includes all noise
sources and DNL artifacts.
Effective Number of Bits (ENOB)
ENOB is a measurement of the resolution with a sine wave
input. It is expressed in bits and is related to SINAD as follows:
ENOB = (SINADdB 1.76)/6.02
Effective Resolution
Effective resolution is expressed in bits and is calculated as follows:
Effective Resolution = log2(2N/RMS Input Noise)
Gain Error
The last transition (from 111 … 10 to 111 … 11) should occur
for an analog voltage 1 LSB below the nominal full scale
(4.999542 V for the 0 V to 5 V range). The gain error is the
deviation of the difference between the actual level of the last
transition and the actual level of the first transition from the
difference between the ideal levels.
Integral Nonlinearity Error (INL)
INL 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 (see Figure 22).
Noise-Free Code Resolution
Noise-free code resolution is the number of bits beyond which it
is impossible to distinctly resolve individual codes. It is expressed
in bits and is calculated as follows:
Noise-Free Code Resolution = log2(2N/Peak-to-Peak Noise)
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-and-Distortion (SINAD) Ratio
SINAD 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
SINAD is expressed in decibels.
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.
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.
Transient Response
Transient response is the time required for the ADC to accurately
acquire its input after a full-scale step function is applied.
Zero Error
Zero error is the difference between the ideal midscale voltage
(0 V) and the actual voltage producing the midscale output code,
that is, 0 LSB.
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