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AD7888BR датащи(PDF) 6 Page - Analog Devices

номер детали AD7888BR
подробное описание детали  2.7V to 5.25 V Micropower 8-Channel 125 kSPS 12-Bit ADC in 16-Lead TSSOP
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7888BR датащи(HTML) 6 Page - Analog Devices

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REV. B
AD7888
–6–
TERMINOLOGY
Integral Nonlinearity
This is the maximum deviation from a straight line passing
through the endpoints of the ADC transfer function. The end-
points of the transfer function are zero scale, a point 1/2 LSB
below the first code transition, and full scale, a point 1/2 LSB
above the last code transition.
Differential Nonlinearity
This is the difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (00 . . . 000) to
(00 . . . 001) from the ideal, i.e., AGND + 0.5 LSB.
Offset Error Match
This is the difference in offset error between any two channels.
Gain Error
This is the deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal (i.e., VREF – 1.5 LSB) after the
offset error has been adjusted out.
Gain Error Match
This is the difference in gain error between any two channels.
Track/Hold Acquisition Time
The track/hold amplifier returns into track mode at the end of
conversion. 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.
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 amplitude of
the fundamental. Noise is the sum of all nonfundamental sig-
nals up to half the sampling frequency (fS/2), excluding dc. The
ratio is dependent on the number of quantization levels in the
digitization process; the more levels, the smaller the quantiza-
tion 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 74 dB.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the fundamental. For the AD7888, it is defined as:
THD dB
VVV
VV
V
(
) log
=
++
++
2
2
3
2
4
2
5
2
6
2
1
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.
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 ADCs
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 distortion terms are
those for which neither m nor n is 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 AD7888 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 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 as
per the THD specification where it is the ratio of the rms sum of
the individual distortion products to the rms amplitude of the
sum of the fundamentals expressed in dBs.
Channel-to-Channel Isolation
Channel-to-channel isolation is a measure of the level of crosstalk
between channels. It is measured by applying a full-scale 25 kHz
sine wave signal to all nonselected input channels and determin-
ing how much that signal is attenuated in the selected channel.
The figure given is the worst case across all four or eight chan-
nels for the AD7888.
PSR (Power Supply Rejection)
Variations in power supply will affect the full-scale transition,
but not the converter’s linearity. Power supply rejection is the
maximum change in the full-scale transition point due to a
change in power-supply voltage from the nominal value.


Аналогичный номер детали - AD7888BR

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD7888BR-REEL AD-AD7888BR-REEL Datasheet
197Kb / 17P
   2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
REV. C
AD7888BR-REEL AD-AD7888BR-REEL Datasheet
245Kb / 18P
   Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
AD7888BR-REEL7 AD-AD7888BR-REEL7 Datasheet
197Kb / 17P
   2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
REV. C
AD7888BR-REEL7 AD-AD7888BR-REEL7 Datasheet
245Kb / 18P
   Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
AD7888BRZ AD-AD7888BRZ Datasheet
197Kb / 17P
   2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
REV. C
More results

Аналогичное описание - AD7888BR

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD7888 AD-AD7888_10 Datasheet
197Kb / 17P
   2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
REV. C
AD7888ARUZ-REEL7 AD-AD7888ARUZ-REEL7 Datasheet
197Kb / 17P
   2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
REV. C
AD7888 AD-AD7888_17 Datasheet
245Kb / 18P
   Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
AD7887 AD-AD7887 Datasheet
133Kb / 16P
   2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
REV. B
AD7887 AD-AD7887_09 Datasheet
444Kb / 24P
   2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP
REV. D
AD7887 AD-AD7887_15 Datasheet
392Kb / 24P
   2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP
Rev. E
AD7887 AD-AD7887_17 Datasheet
465Kb / 25P
   Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP
AD7923 AD-AD7923_17 Datasheet
423Kb / 25P
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AD7927 AD-AD7927_17 Datasheet
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   8-Channel, 200 kSPS, 12-Bit ADC Sequencer in 20-Lead TSSOP
AD7923 AD-AD7923_11 Datasheet
380Kb / 24P
   4-Channel, 200 kSPS 12-Bit ADC with Sequencer in 16-Lead TSSOP
REV. C
More results


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