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5962-9475501MPA 参数 Datasheet PDF下载

5962-9475501MPA图片预览
型号: 5962-9475501MPA
PDF下载: 下载PDF文件 查看货源
内容描述: [True Bipolar Input, Single Supply, 12-Bit, Serial 6 µs ADC in 8-Pin Package]
分类和应用: 信息通信管理转换器
文件页数/大小: 12 页 / 339 K
品牌: ADI [ ADI ]
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AD7893  
TERMINOLOGY  
Relative Accuracy  
Signal to (Noise + Distortion) Ratio  
Relative accuracy or endpoint nonlinearity is the maximum  
deviation from a straight line passing through the endpoints of  
the ADC transfer function.  
This is the measured ratio of signal to (noise + distortion) at the  
output of the A/D converter. The signal is the rms amplitude of  
the fundamental. Noise is the rms sum of all nonfundamental  
signals up to half the sampling frequency (fS/2), excluding dc.  
The ratio is dependent upon the number of quantization levels  
in the digitization process; the more levels, the smaller the quan-  
tization noise. The theoretical signal to (noise + distortion) ratio  
for an ideal N-bit converter with a sine wave input is given by:  
Differential Nonlinearity  
This is the difference between the measured and the ideal 1 LSB  
change between any two adjacent codes in the ADC.  
Positive Full-Scale Error (AD7893-10)  
This is the deviation of the last code transition (01 . . . 110 to  
01 . . . 111) from the ideal 4 × REF IN – 1 LSB (AD7893-10  
±10 V range) after the Bipolar Zero Error has been adjusted out.  
Signal to (Noise + Distortion) = (6.02 N + 1.76) dB  
Thus for a 12-bit converter, this is 74 dB.  
Positive Full-Scale Error (AD7893-3)  
Total Harmonic Distortion  
Total harmonic distortion (THD) is the ratio of the rms sum of  
harmonics to the fundamental. For the AD7893, it is defined as:  
This is the deviation of the last code transition (01 . . . 110 to  
01 . . . 111) from the ideal (REF IN – 1 LSB) after the  
Bipolar Zero Error has been adjusted out.  
Positive Full-Scale Error (AD7893-5)  
V22 +V32 +V42 +V52 +V62  
This is the deviation of the last code transition (11 . . . 110 to  
11 . . . 111) from the ideal (2 × REF IN – 1 LSB) after the Uni-  
polar Offset Error has been adjusted out.  
THD(dB) = 20 log  
V1  
where V1 is the rms amplitude of the fundamental and V2, V3,  
V4, V5 and V6 are the rms amplitudes of the second through the  
sixth harmonics.  
Positive Full-Scale Error (AD7893-2)  
This is the deviation of the last code transition (11 . . . 110 to  
11 . . . 111) from the ideal (REF IN – 1 LSB) after the Unipolar  
Offset Error has been adjusted out.  
Peak Harmonic or Spurious Noise  
Peak harmonic or spurious noise is defined as the ratio of the  
rms value of the next largest component in the ADC output  
spectrum (up to fS/2 and excluding dc) to the rms value of the  
fundamental. Normally, the value of this specification is deter-  
mined by the largest harmonic in the spectrum, but for parts  
where the harmonics are buried in the noise floor, it will be a  
noise peak.  
Bipolar Zero Error (AD7893-10, ؎10 V; AD7893-3, ؎2.5 V)  
This is the deviation of the midscale transition (all 0s to all 1s)  
from the ideal 0 V (AGND).  
Unipolar Offset Error (AD7893-2, AD7893-5)  
This is the deviation of the first code transition (00 . . . 000 to  
00 . . . 001) from the ideal 1 LSB.  
Negative Full-Scale Error (AD7893-10)  
Intermodulation Distortion  
This is the deviation of the first code transition (10 . . . 000 to  
10 . . . 001) from the ideal –4 × REF IN + 1 LSB (AD7893-10  
±10 V range) after Bipolar Zero Error has been adjusted out.  
With inputs consisting of sine waves at two frequencies, fa and  
fb, any active device with nonlinearities will create distortion  
products at sum and difference frequencies of mfa ± nfb where  
m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for  
which neither m nor n are equal to zero. For example, the second  
order terms include (fa + fb) and (fa – fb), while the third order  
terms include (2 fa + fb), (2 fa – fb), (fa + 2 fb) and (fa – 2 fb).  
Negative Full-Scale Error (AD7893-3)  
This is the deviation of the first code transition (10 . . . 000 to  
10 . . . 001) from the ideal (–REF IN + 1 LSB) after Bipolar  
Zero Error has been adjusted out.  
The AD7893 is tested using the CCIF standard where two  
input frequencies near the top end of the input bandwidth are  
used. In this case, the second and third order terms are of differ-  
ent significance. The second order terms are usually distanced  
in frequency from the original sine waves, while the third order  
terms are usually at a frequency close to the input frequencies.  
As a result, the second and third order terms are specified sepa-  
rately. The calculation of the intermodulation distortion is per  
the THD specification where it is the ratio of the rms sum of the  
individual distortion products to the rms amplitude of the fun-  
damental expressed in dBs.  
Track/Hold Acquisition Time  
Track/Hold acquisition time is the time required for the output  
of the track/hold amplifier to reach its final value, within  
±1/2 LSB, after the end of conversion (the point at which the  
track/hold returns to track mode). It also applies to situations  
where there is a step input change on the input voltage applied  
to the VIN input of the AD7893. This means that the user must  
wait for the duration of the track/hold acquisition time after the  
end of conversion or after a step input change to VIN before  
starting another conversion, to ensure that the part operates to  
specification.  
REV. E  
–5–