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參數(shù)資料
| 型號： | AD7992 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
| 中文描述： | 2通道，12位I2C兼容接口的ADC的10引腳MSOP |
| 文件頁數(shù)： | 7/21頁 |
| 文件大小： | 266K |
| 代理商： | AD7992 |
AD7992
–7–
REV. PrH
PRELIMINARY TECHNICAL DATA
TERMINOLOGY
Signal to (Noise + Distortion) Ratio
This is the measured ratio of signal to (noise + distor-
tion) 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 + 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 AD7992,
it is defined as:
THD (dB )
=
20 log
V
2
2
+
V
3
2
+
V
4
2
+
V
5
2
+
V
6
2
V
1
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 determined by the largest har-
monic in the spectrum, but for ADCs where the har-
monics are buried in the noise floor, it will be a noise
peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequen-
cies, 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 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 AD7992 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 speci-
fied separately. 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 funda-
mentals 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
fullscale TBD kHz sine wave signal to the nonselected
input channels and determining how much the TBD kHz
signal is attenuated in the selected channel.
This figure is
given worse case across all channels
Aperture Delay
This is the measured interval between the leading edge of
the sampling clock and the point at which the ADC actu-
ally takes the sample.
Aperture Jitter
This is the sample-to-sample variation in the effective
point in time at which the sample is taken.
Full Power Bandwidth
The Full Power Bandwidth of an ADC is that input fre-
quency at which the amplitude of the reconstructed Fun-
damental is reduced by 0.1 dB or 3 dB for a full-scale
input
PSRR (Power Supply Rejection Ratio)
The power supply rejection ratio is defined as the ratio of
the power in the ADC output at full-scale frequency, f, to
the power of a 200 mV p-p sine wave applied to the ADC
V
DD
supply of frequency f
s
.
PSRR (dB) = 10
log (Pf/Pfs)
Pf
is the power at frequency f in the ADC output;
Pfs
is
the power at frequency fs coupled onto the ADC V
DD
supply.
Integral Nonlinearity
This is the maximum deviation from a straight line pass-
ing through the endpoints of the ADC transfer function.
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
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 + 1LSB
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., REF
IN
– 1
LSB) after the offset error has been adjusted out.
Gain Error Match
This is the difference in Gain error between any two chan-
nels.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7992BRM-0 | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
| AD7992BRM-1 | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
| AD7994BRU-0 | 4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
| AD7994BRU-1 | 4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
| AD7993BRU-0 | 4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7992_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
| AD7992BRM-0 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP |
| AD7992BRM-0REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP T/R |
| AD7992BRM-1 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP 制造商:Rochester Electronics LLC 功能描述:2-CHANNEL, 12-BIT ADC WITH 12C ITF I.C. - Bulk |
| AD7992BRM-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP T/R |
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