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參數(shù)資料
| 型號： | AD7266BSU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Differential Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC |
| 中文描述： | DUAL 3-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQFP32 |
| 封裝： | MS-026ABA, TQFP-32 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 752K |
| 代理商： | AD7266BSU |
Preliminary Technical Data
AD7266
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 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 AD7266 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
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.
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 full-scale transition point due to a change
in power supply voltage from the nominal value. See Typical
Performance Curves.
Rev. PrG | Page 9 of 17
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