- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄373917 > AD7823YN (ANALOG DEVICES INC) 1.2V, 12 Bit 200KSPS, Serial ADC 6-SOT-23 -40 to 85 PDF資料下載
參數(shù)資料
| 型號(hào)： | AD7823YN |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | ADC |
| 英文描述： | 1.2V, 12 Bit 200KSPS, Serial ADC 6-SOT-23 -40 to 85 |
| 中文描述： | 1-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8 |
| 封裝： | 0.300 INCH, MINI, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 5/11頁(yè) |
| 文件大小： | 155K |
| 代理商： | AD7823YN |
AD7823
–5–
REV. B
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 amplitude 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 an 8-bit converter, this is 50 dB.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the fundamental. For the AD7823 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 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
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 AD7823 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 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 second and third order terms are
specified 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 fundamental 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.
Offset Error
This is the deviation of the first code transition (0000 . . . 000)
to (0000 . . . 001) from the ideal, i.e., AGND + 1 LSB.
Gain Error
This is the deviation of the last code transition (1111 . . . 110)
to (1111 . . . 111) from the ideal (i.e., V
REF
– 1 LSB) after the
offset 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
±
1/2 LSB, 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 AD7823. 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.
Typical Performance Characteristics
THROUGHPUT
–
kSPS
10
0
0.010
30
P
–
10
0.1
20
40
50
Figure 2. Power vs. Throughput
FREQUENCY BINS
0
–
70
–
100
d
–
10
–
60
–
80
–
90
–
30
–
50
–
20
–
40
1
2
4
6
8
1
1
1
1
1
2
2
2
2
3
3
3
3
3
4
4
4
4
5
5
5
5
5
6
6
6
6
7
7
7
7
7
8
8
8
8
9
9
9
9
9
1
AD7823
2048 POINT FFT
SAMPLING 136.054
F
IN
29.961
Figure 3. AD7823 SNR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7823YR | 1.2V, 12 Bit 200KSPS, Serial ADC 6-SOT-23 -40 to 85 |
| AD7825 | 3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs |
| AD7825BN | 3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs |
| AD7825BR | 3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs |
| AD7825BRU | 14-Bit 48KSPS DAS with ADC, MUX, PGA and Internal Reference 28-SSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7823YNZ | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Serial 8-Pin PDIP 制造商:Analog Devices 功能描述:IC 8BIT ADC 7823 DIP8 |
| AD7823YNZ | 制造商:Analog Devices 功能描述:IC 8BIT ADC 7823 DIP8 |
| AD7823YR | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Serial 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:8-BIT SERIAL SINGLE ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 8-BIT ADC |
| AD7823YRM | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Serial 8-Pin MSOP 制造商:Rochester Electronics LLC 功能描述:8-BIT SERIAL SINGLE ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 8-BIT ADC |
| AD7823YRM-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Serial 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 8BIT SERL 8MSOP - Tape and Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。