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參數(shù)資料
| 型號： | AD7880CQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Enclosed Switches Series LS: Wobble - Steel Wire; 1NC 1NO DPDT Snap Action, Double Break; 0.5 in - 14NPT conduit; Plug-in |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP24 |
| 封裝： | 0.300 INCH, HERMETIC SEALED, CERDIP-24 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 337K |
| 代理商： | AD7880CQ |
AD7880
–8–
REV. 0
12
11.5
11
10.5
10
INPUT FREQUENCY – kHz
SAMPLE FREQUENCY = 61kHz
T = 25 C
15
30.5
E
Figure 13. Effective Number of Bits vs. Frequency
T otal Harmonic Distortion (T HD)
T HD is the ratio of the rms sum of harmonics to the rms value
of the fundamental. For the AD7880, T HD is defined as:
THD
=
20log
V
2
2
+
V
3
2
+
V
4
2
+
V
5
2
+
V
6
2
V
1
(3)
where V
1
is the rms amplitude of the fundamental and V
2
, V
3
,
V
4
, V
5
and V
6
are the rms amplitudes of the second through the
sixth harmonic. T he T HD is also derived from the FFT plot of
the ADC output spectrum.
Intermodulation Distortion
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 or-
der terms include (fa + fb) and (fa – fb), while the third order
terms include (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb).
Using the CCIF standard where two input frequencies near the
top end of the input bandwidth are used, the second and third
order terms are of different significance. T he 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 separately. T he calculation of the inter-
modulation distortion is as per the T HD specification where it is
the ratio of the rms sum of the individual distortion products to
the rms amplitude of the fundamental expressed in dBs. In this
case, the input consists of two, equal amplitude, low distortion,
sine waves. Figure 14 shows a typical IMD plot for the
AD7880.
Figure 14. IMD Plot
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 will be
determined by the largest harmonic in the spectrum, but for
parts where the harmonics are buried in the noise floor the peak
will be a noise peak.
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