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參數資料
| 型號： | AD7889 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit 600 kSPS ADC(單電源600kSPS12位A/D轉換器) |
| 中文描述： | 12位600 ksps模數轉換器（單電源600kSPS12位的A / D轉換器） |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 285K |
| 代理商： | AD7889 |
AD7889
REV. B PRELIM. 7/97
7
Preliminary Technical Information
lation of the intermodulation distortion is as per the THD
specification where it is the ratio of the rms sum of the indi-
vidual distortion products to the rms amplitude of the funda-
mental expressed in dBs.
Relative Accuracy
Relative accuracy or endpoint nonlinearity is the maximum
deviation from a straight line passing through the endpoints of
the ADC transfer function.
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 (AD7889-1)
This is the deviation of the last code transition (01 . . . 110 to
01 . . . 111) from the ideal 4
×
REF IN 3/2LSB (±10V
range) or 2
×
REF IN 3/2LSB (±5V range) after the bipo-
lar zero
error has been adjusted out.
Positive Full-Scale Error (AD7889-2)
This is the deviation of the last code transition (11 . . . 110 to
11 . . . 111) from the ideal REF IN 3/2LSB (0V to2.5V
range) or 2
×
REF IN 3/2LSB (0V to 5V range) after the
unipolar offset error has been adjusted out.
Positive Full-Scale Error (AD7889-3)
This is the deviation of the last code transition (01 . . . 110 to
01 . . . 111) from the ideal (REF IN 3/2LSB) after the bipo-
lar zero error has been adjusted out.
Bipolar Zero Error (AD7889-1, AD7889-3)
This is the deviation of the midscale transition (all 1s to all 0s)
from the ideal (AGND 1/2LSB).
Unipolar Offset Error (AD7889-2)
This is the deviation of the first code transition (00 . . . 000 to
00 . . . 001) from the ideal (AGND + 1/2LSB).
Negative Full-Scale Error (AD7889-1)
This is the deviation of the first code transition (10 . . . 000 to
10 . . . 001) from the ideal 4
×
REFIN + 1/2LSB (±10V
range) or 2
×
REFIN + 1/2LSB (±5V range) after bipolar
zero error has been adjusted out.
Negative Full-Scale Error (AD7889-3)
This is the deviation of the first code transition (10 . . . 000 to
10 . . . 001) from the ideal REFIN + 1/2LSB after bipolar
zero error has been adjusted out.
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
±1/2LSB, 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 V
IN
input of the AD7889. It 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 V
IN
before
starting another conversion, to ensure that the part operates to
specification.
TERMINOLOGY
Signal to (Noise + Distortion) Ratio
This is the measured ratio of signal to (noise + distortion) at
the output of the A/D converter. The signal is the rms ampli-
tude of the fundamental. Noise is the rms sum of all
nonfundamental signals up to half the sampling frequency (f
S
/
2), excluding dc. The ratio is dependent upon the number of
quantization levels in the digitization process; the more levels,
the smaller the quantization noise. The theoretical signal to
(noise + distortion)
ratio for an ideal N-bit converter with a sine wave input is
given by:
Signal to
(
Noise + Distortion
)
=
(6.02
N +
1.76)
dB
Thus for a 12-bit converter, this is 74dB.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum
of harmonics to the fundamental. For the AD7889, it is de-
fined as:
THD (dB )= 20log
V
2
2
+V
3
2
+V
4
V
1
2
+V
5
2
+V
6
2
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 harmonics.
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 f
S
/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.
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 sec-
ond order terms include (fa + fb) and (fa fb), while the third
order terms include (2fa + fb), (2fa fb), (fa + 2fb) and
(fa 2fb).
The AD7889 is tested using two input frequencies away from
the bottom end of the input bandwidth. In this case, the sec-
ond and third order terms are of different 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 sec-
ond and third order terms are specified separately. The calcu-
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