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參數(shù)資料
| 型號： | AD7920BKS-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70 |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO6 |
| 封裝： | MO-203AB, SC-70, 6 PIN |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 1091K |
| 代理商： | AD7920BKS-REEL |
REV. B
–8–
AD7910/AD7920
TERMINOLOGY
Integral Nonlinearity
The maximum deviation from a straight line passing through the
endpoints of the ADC transfer function. For the AD7920 and
AD7910, the endpoints of the transfer function are zero scale, a
point 1 LSB below the first code transition, and full scale, a point
1 LSB above the last code transition.
Differential Nonlinearity
The difference between the measured and the ideal 1 LSB change
between any two adjacent codes in the ADC.
Offset Error
The deviation of the first code transition (00 . . . 000) to (00 . . . 001)
from the ideal, i.e., GND + 1 LSB.
Gain Error
The deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal, i.e., V
REF
– 1 LSB after the offset
error has been adjusted out.
Track-and-Hold Acquisition Time
The track-and-hold amplifier returns to track mode at the end of
conversion. Track-and-hold acquisition time is the time required
for the output of the track-and-hold amplifier to reach its final
value, within
±
0.5 LSB, after the end of conversion. See the
Serial Interface section for more details.
Signal-to-(Noise + Distortion) Ratio
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 sum of all nonfundamental signals up
to half the sampling frequency (f
S
/2), excluding dc. The ratio is
dependent on 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
Thus, for a 12-bit converter this is 74dB, and for a 10-bit converter
this is 62 dB.
Distortion
N
(
)
(6 02
.
)
+
=
+
1 76 dB
Total Unadjusted Error
A comprehensive specification that includes gain error, linearity
error, and offset error.
Total Harmonic Distortion (THD)
Total harmonic distortion is the ratio of the rms sum of har-
monics to the fundamental. It is defined as:
THD
V
V
V
V
V
V
2
2
3
2
4
2
5
2
6
2
1
(
)
log
dB
=
+
+
+
+
20
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 spec-
trum (up to f
S
/2 and excluding dc) to the rms value of the funda-
mental. Normally, the value of this specification is determined by
the largest harmonic in the spectrum, but for ADCs whose har-
monics 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, and so on. Intermodulation distortion 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 (2fa + fb), (2fa – fb), (fa + 2fb), and (fa – 2fb).
The AD7910/AD7920 are tested using the CCIF standard, where
two input frequencies are used (see fa and fb in the specification
page). In this case, 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 separately.
The calculation of the intermodulation distortion is as per the
THD specification, the ratio of the rms sum of the individual
distortion products to the rms amplitude of the sum of the funda-
mentals, expressed in dB.
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