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| 型號： | AD7482BSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SAR 3MSPS 48-LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 3M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 90mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 1 個(gè)單端，單極 |
| 產(chǎn)品目錄頁面： | 778 (CN2011-ZH PDF) |
AD7482
Rev. B | Page 11 of 20
TERMINOLOGY
Integral Nonlinearity
The integral nonlinearity is the maximum deviation from a
straight line passing through the endpoints of the ADC transfer
function. The endpoints 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
The differential nonlinearity is the difference between the
measured and ideal 1 LSB change between any two adjacent
codes in the ADC.
Offset Error
The offset error is the deviation of the first code transition
(00...000) to (00...001) from the ideal, that is, AGND + 0.5 LSB.
Gain Error
The gain error is the deviation of the last code transition
(111...110) to (111...111) from the ideal, that is, VREF 1.5 LSB
after the offset error is adjusted out.
Track-and-Hold Acquisition Time
Track-and-hold acquisition time is the time required for the
output of the track-and-hold amplifier to reach its final value,
within ±1/2 LSB, after the end of conversion (the point at which
the track-and-hold returns to track mode).
Signal-to-Noise + Distortion (SINAD) Ratio
The SINAD ratio is the measured ratio of signal-to-noise +
distortion at the output of the ADC. The signal is the rms
amplitude of the fundamental. Noise is the sum of all nonfunda-
mental signals 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
quantization noise. The theoretical SINAD ratio for an ideal N-bit
converter with a sine wave input is given by:
Signal-to-Noise + Distortion = (6.02N +1.76)dB
Therefore, this is 74 dB for a 12-bit converter.
Total Harmonic Distortion (THD)
The THD is the ratio of the rms sum of the harmonics to the
fundamental. It is defined as
1
2
6
2
5
2
4
2
3
2
log
20
)
dB
(
V
THD
+
=
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
The peak harmonic or spurious noise is 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.
The value of this specification is usually determined by the largest
harmonic in the spectrum, but for ADCs where the harmonics
are buried in the noise floor, it is a noise peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities creates distortion products
at sum and difference frequencies of mfa ± nfb, where m and n = 0,
1, 2, 3, and so on. 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), wh
ereas the third order
terms include (2fa + fb), (2fa fb), (fa + 2fb), and (fa 2fb).
The AD7482 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, whereas the third order terms are
usually at a frequency close to the input frequencies. As a result,
the second order 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 sum
of the fundamentals expressed in dBs.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7484 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3MSPS, 14-Bit SAR ADC |
| AD7484BST | 制造商:Analog Devices 功能描述:ADC Single SAR 3Msps 14-bit Parallel 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:14 BIT 3.0 MEG ADC IC - Tape and Reel 制造商:Analog Devices 功能描述:A/D Converter (A-D) IC |
| AD7484BSTZ | 功能描述:IC ADC 14BIT SAR 3MSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7484BSTZ | 制造商:Analog Devices 功能描述:IC 14-BIT ADC |
| AD7485 | 制造商:AMICC 制造商全稱:AMIC Technology 功能描述:1 MSPS, Serial 14-Bit SAR ADC |
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