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參數資料
| 型號： | AD7893BN-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | DIODE ZENER SINGLE 200mW 9.1Vz 5mA-Izt 0.021 0.5uA-Ir 6 SOD-323 3K/REEL |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8 |
| 封裝： | 0.300 INCH, MINI, PLASTIC, DIP-8 |
| 文件頁數： | 5/12頁 |
| 文件大?。?/td> | 340K |
| 代理商： | AD7893BN-2 |
AD7893
–5–
REV. E
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 1LSB
change between any two adjacent codes in the ADC.
Positive Full-Scale Error (AD7893-10)
This is the deviation of the last code transition (01 . . . 110 to
01 . . . 111) from the ideal 4
×
REF IN – 1 LSB (AD7893-10
±
10 V range) after the Bipolar Zero Error has been adjusted out.
Positive Full-Scale Error (AD7893-3)
This is the deviation of the last code transition (01 . . . 110 to
01 . . . 111) from the ideal (REF IN – 1 LSB) after the
Bipolar Zero Error has been adjusted out.
Positive Full-Scale Error (AD7893-5)
This is the deviation of the last code transition (11 . . . 110 to
11 . . . 111) from the ideal (2
×
REF IN – 1 LSB) after the Uni-
polar Offset Error has been adjusted out.
Positive Full-Scale Error (AD7893-2)
This is the deviation of the last code transition (11 . . . 110 to
11 . . . 111) from the ideal (REF IN – 1 LSB) after the Unipolar
Offset Error has been adjusted out.
Bipolar Zero Error (AD7893-10,
6
10 V; AD7893-3,
6
2.5 V)
This is the deviation of the midscale transition (all 0s to all 1s)
from the ideal 0 V (AGND).
Unipolar Offset Error (AD7893-2, AD7893-5)
This is the deviation of the first code transition (00 . . . 000 to
00 . . . 001) from the ideal 1 LSB.
Negative Full-Scale Error (AD7893-10)
This is the deviation of the first code transition (10 . . . 000 to
10 . . . 001) from the ideal –4
×
REF IN + 1 LSB (AD7893-10
±
10 V range) after Bipolar Zero Error has been adjusted out.
Negative Full-Scale Error (AD7893-3)
This is the deviation of the first code transition (10 . . . 000 to
10 . . . 001) from the ideal (–REF IN + 1 LSB) 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
±
1/2 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 AD7893. This 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 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 quan-
tization 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 AD7893, it is defined as:
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 second
order terms include (fa + fb) and (fa – fb), while the third order
terms include (2 fa + fb), (2 fa – fb), (fa + 2 fb) and (fa – 2 fb).
The AD7893 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 differ-
ent 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 sepa-
rately. The calculation of the intermodulation distortion is per
the THD specification where it is the ratio of the rms sum of the
individual distortion products to the rms amplitude of the fun-
damental expressed in dBs.
THD
(
dB
)
=
20 log
V
2
2
+
V
3
2
+
V
4
V
1
2
+
V
5
2
+
V
6
2
相關PDF資料 |
PDF描述 |
|---|---|
| AD7893BN-5 | RECTIFIER FAST-RECOVERY SINGLE 1A 50V 30A-ifsm 1V-vf 50ns 5uA-ir DO-41 5K/AMMO |
| AD7894 | 5 V, 14-Bit Serial, 5 ms ADC in SO-8 Package |
| AD7894AR-10 | Metal Oxide Varistor (MOV); Voltage Rating AC, Vrms:130Vrms; Voltage Rating DC, Vdc:170VDC; Peak Surge Current (8/20uS), Itm:6000A; Clamping Voltage 8/20us Max :340V; Capacitance, Cd:650pF; Package/Case:14mm Disc |
| AD7894AR-2 | VARISTOR 30VRMS 14MM RADIAL |
| AD7894AR-3 | VARISTOR 320V RMS 14MM RADIAL |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7893BN-5 | 制造商:Rochester Electronics LLC 功能描述:12-BIT ADC,8-PIN I.C. - Bulk 制造商:Analog Devices 功能描述: |
| AD7893BNZ-10 | 功能描述:IC ADC 12BIT SRL T/H LP 8DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7893BNZ-2 | 功能描述:IC ADC 12BIT SRL T/H LP 8DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7893BNZ-5 | 制造商:Analog Devices 功能描述:ADC Single SAR 117ksps 12-bit Serial 8-Pin PDIP |
| AD7893BR-10 | 功能描述:IC ADC 12BIT SRL T/H LP 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
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