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5962-9316401MXA 参数 Datasheet PDF下载

5962-9316401MXA图片预览
型号: 5962-9316401MXA
PDF下载: 下载PDF文件 查看货源
内容描述: 12位100 kSPS的A / D转换器 [12-Bit 100 kSPS A/D Converter]
分类和应用: 转换器模数转换器信息通信管理
文件页数/大小: 12 页 / 258 K
品牌: ADI [ ADI ]
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AD1674  
D EFINITIO N O F SP ECIFICATIO NS  
are present in a sample sequence. T he result, called Prime  
Coherent Sampling, is a highly accurate and repeatable measure  
of the actual frequency-domain response of the converter.  
INTEGRAL NO NLINEARITY (INL)  
T he ideal transfer function for an ADC is a straight line drawn  
between “zero” and “full scale.” T he point used as “zero”  
occurs 1/2 LSB before the first code transition. “Full scale” is  
defined as a level 1 1/2 LSB beyond the last code transition.  
Integral nonlinearity is the worst-case deviation of a code from  
the straight line. T he deviation of each code is measured from  
the middle of that code.  
NYQ UIST FREQ UENCY  
An implication of the Nyquist sampling theorem, the “Nyquist  
Frequency” of a converter is that input frequency which is one-  
half the sampling frequency of the converter.  
SIGNAL-TO -NO ISE AND D ISTO RTIO N (S/N+D ) RATIO  
S/(N+D) is the ratio of the rms value of the measured input sig-  
nal to the rms sum of all other spectral components below the  
Nyquist frequency, including harmonics but excluding dc. T he  
value for S/(N+D) is expressed in decibels.  
D IFFERENTIAL NO NLINEARITY (D NL)  
A specification which guarantees no missing codes requires that  
every code combination appear in a monotonic increasing  
sequence as the analog input level is increased. T hus every code  
must have a finite width. T he AD1674 guarantees no missing  
codes to 12-bit resolution; all 4096 codes are present over the  
entire operating range.  
TO TAL H ARMO NIC D ISTO RTIO N (TH D )  
T HD is the ratio of the rms sum of the first six harmonic com-  
ponents to the rms value of a full-scale input signal and is ex-  
pressed as a percentage or in decibels. For input signals or  
harmonics that are above the Nyquist frequency, the aliased  
component is used.  
UNIP O LAR O FFSET  
T he first transition should occur at a level 1/2 LSB above ana-  
log common. Unipolar offset is defined as the deviation of the  
actual transition from that point at 25°C. T his offset can be  
adjusted as shown in Figure 11.  
INTERMO D ULATIO N D ISTO RTIO N (IMD )  
With inputs consisting of sine waves at two frequencies, fa and  
fb, any device with nonlinearities will create distortion products,  
of order (m+n), at sum and difference frequencies of mfa ± nfb,  
where m, n = 0, 1, 2, 3. . . . Intermodulation terms are those for  
which m or n is not equal to zero. For example, the second  
order terms are (fa + fb) and (fa – fb) and the third order terms  
are (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb). T he IMD  
products are expressed as the decibel ratio of the rms sum of the  
measured input signals to the rms sum of the distortion terms.  
T he two signals are of equal amplitude and the peak value of  
their sums is –0.5 dB from full scale. T he IMD products are  
normalized to a 0 dB input signal.  
BIP O LAR O FFSET  
In the bipolar mode the major carry transition (0111 1111 1111  
to 1000 0000 0000) should occur for an analog value 1/2 LSB  
below analog common. T he bipolar offset error specifies the  
deviation of the actual transition from that point at 25°C. T his  
offset can be adjusted as shown in Figure 12.  
FULL-SCALE ERRO R  
T he last transition (from 1111 1111 1110 to 1111 1111 1111)  
should occur for an analog value 1 1/2 LSB below the nominal  
full scale (9.9963 volts for 10 volts full scale). T he full-scale  
error is the deviation of the actual level of the last transition  
from the ideal level at 25°C. The full-scale error can be adjusted  
to zero as shown in Figures 11 and 12.  
FULL-P O WER BAND WID TH  
T he full-power bandwidth is that input frequency at which the  
amplitude of the reconstructed fundamental is reduced by 3 dB  
for a full-scale input.  
TEMP ERATURE D RIFT  
T he temperature drifts for full-scale error, unipolar offset and  
bipolar offset specify the maximum change from the initial  
FULL-LINEAR BAND WID TH  
T he full-linear bandwidth is the input frequency at which the  
slew rate limit of the sample-hold-amplifier (SHA) is reached.  
At this point, the amplitude of the reconstructed fundamental  
has degraded by less than –0.1 dB. Beyond this frequency, dis-  
tortion of the sampled input signal increases significantly.  
(25°C) value to the value at TMIN or T MAX  
.
P O WER SUP P LY REJECTIO N  
T he effect of power supply error on the performance of the  
device will be a small change in full scale. T he specifications  
show the maximum full-scale change from the initial value with  
the supplies at various limits.  
AP ERTURE D ELAY  
Aperture delay is a measure of the SHA’s performance and is  
measured from the falling edge of Read/Convert (R/C) to when  
the input signal is held for conversion.  
FREQ UENCY-D O MAIN TESTING  
T he AD1674 is tested dynamically using a sine wave input and  
a 2048 point Fast Fourier T ransform (FFT ) to analyze the  
resulting output. Coherent sampling is used, wherein the ADC  
sampling frequency and the analog input frequency are related  
to each other by a ratio of integers. T his ensures that an integral  
multiple of input cycles is captured, allowing direct FFT pro-  
cessing without windowing or digital filtering which could mask  
some of the dynamic characteristics of the device. In addition,  
the frequencies are chosen to he “relatively prime” (no common  
factors) to maximize the number of different ADC codes that  
AP ERTURE JITTER  
Aperture jitter is the variation in aperture delay for successive  
samples and is manifested as noise on the input to the A/D.  
–8–  
REV. C