参数资料
型号: AD7490BRUZ
厂商: Analog Devices Inc
文件页数: 4/29页
文件大小: 0K
描述: IC ADC 12BIT 16CH 1MSPS 28TSSOP
产品变化通告: IDD Specification Change 17/Jun/2009
标准包装: 50
位数: 12
采样率(每秒): 1M
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 12.5mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 28-TSSOP
包装: 管件
输入数目和类型: 16 个单端,单极
产品目录页面: 778 (CN2011-ZH PDF)
Data Sheet
AD7490
Rev. D | Page 11 of 28
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 fS/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
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 the sum and difference frequencies of mfa ± nfb,
where m, n = 0, 1, 2, 3, and so on. 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 AD7490 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, and 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
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 decibels.
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