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AS1419F-XT 参数 Datasheet PDF下载

AS1419F-XT图片预览
型号: AS1419F-XT
PDF下载: 下载PDF文件 查看货源
内容描述: 14位, 800ksps的采样A / D转换器,带有关断 [14 Bit, 800ksps Sampling A/D Converter with Shutdown]
分类和应用: 转换器
文件页数/大小: 20 页 / 998 K
品牌: AUSTIN [ AUSTIN SEMICONDUCTOR ]
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ADC  
AS1419  
AS1419A  
Austin Semiconductor, Inc.  
Signal-to-Noise Ratio  
Total Harmonic Distortion  
The signal-to-noise plus distortion ratio [S/(N + D)] is the  
ratio between the RMS amplitude of the fundamental input  
frequency to the RMS amplitude of all other frequency  
components at the A/D output. The output is band limited to  
frequencies from above DC and below half the sampling  
frequency. Figure 2 shows a typical spectral content with a  
800kHz sampling rate and a 100kHz input. The dynamic  
performance is excellent for input frequencies up to and  
beyond the Nyquist limit of 400kHz.  
Total harmonic distortion (THD) is the ratio of the RMS  
sum of all harmonics of the input signal to the fundamental  
itself. The out-of-band harmonics alias into the frequency band  
between DC and half the sampling frequency. THD is expressed  
as:  
Effective Number of Bits  
The effective number of bits (ENOBs) is a measurement of  
the resolution of anADC and is directly related to the S/(N + D)  
by the equation:  
where V1 is the RMS amplitude of the fundamental frequency  
and V2 through Vn are the amplitudes of the second through  
nth harmonics. THD vs Input Frequency is shown in Figure 4.  
TheAS1419 has good distortion performance up to the Nyquist  
frequency and beyond.  
N = [S/(N + D) – 1.76]/6.02  
where N is the effective number of bits of resolution and  
S/(N + D) is expressed in dB.At the maximum sampling rate of  
800kHz, the AS1419 maintains near ideal ENOBs up to the  
Nyquist input frequency of 400kHz (refer to Figure 3).  
FIGURE 4: Distortion vs. Input Frequency  
FIGURE 3: Effective Bits and Signal/  
(Noise+Distortion) vs. Input Frequency  
FIGURE 5: Intermodulation Distortion  
Plot  
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.  
AS1419 & AS1419A  
Rev. 1.5 08/09  
9
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