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飞利浦SAA7220P/A, /B & /C类型的差别
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来源:少帅音响 发布者:管理员 浏览:4158 发表时间:2015-6-17 11:27:44
标签: 飞利浦 

飞利浦saa7220p /最初被设计用于数字音频应用使用频率44.1kHz的采样率(±10%)。它也可以用于32(±10%)和48kHz(不耐受)的应用如数据。
的saa7220p / B是一种改进的'装置给1dB的FIR滤波器的通带性能更好的版本,使用不同的ROM系数达到。这两种类型的另一个区别是,在累加器中的偏移量大大减小(+ 0.05%在“B”相比,5%的“A”)。的saa7220p /必修+ 5%偏移,当使用TDA1541双DAC提供最佳性能。然而,与“B”版胶印不再是必要的性能优化。
的saa7220p证已专门设计用于卫星更好的性能(32)的应用。又有一套不同的ROM系数。他们是这样选择的,过渡带(0~50dB)比“A”或“B”的版本,14.6 17.0khz更尖锐(为“C”)相比,14.6 17.7khz(为“A”和“B”)在32kHz采样率。的saa7220p证也有降低蓄电池偏移±0.05%。
后过滤
“A”和“B”的saa7220版本被设计用来与三分之一阶巴特沃斯或贝塞尔汤姆森后滤波器的通带具有滚降补偿这。“C”版的第四阶椭圆滤波器的建议,为了给一个平坦的整体反应。


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==============国外原文================

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The SAA7220P/A was originally designed for digital audio applications using a sampling rate frequency of 44.1kHz (±10%). It can also be used for 32kHz(±10%) and 48kHz(no tolerance) applications suc as DAT. 

The SAA7220P/B is an improved version of the 'A' device giving 1dB better performance in the passband of the FIR filter, achieved by using different ROM coefficients. The other difference between the two types is that the offset in the accumulator is greatly reduced (+0.05% in the 'B' compared to +5% in the 'A'). The SAA7220P/A required a +5% offset to give optimum performance when used with the TDA1541 dual DAC. However, with the 'B' version this offset is no longer necessary for optimum performance. 

The SAA7220P/C has been specifically designed for better performance for satellite (32kHz) applications. Again it has a different set of ROM coefficients. They are chosen such that the transition band (0 to -50db) is much sharper than for the 'A' or 'B' versions - 14.6 to 17.0kHz (for the 'C') compared to 14.6 to 17.7kHz (for the 'A' and the 'B') at the 32kHz sampling rate. The SAA7220P/C also has the reduced accumulator offset to +0.05%. 

Post filtering
The 'A' and the 'B' versions of the SAA7220 are designed to be used with a third order Thomson-Butterworth or Bessel post filter as the passband has roll-off compensation for this. For 'C' version a 4th order elliptical filter is recommended in order to give a flatter overall response.


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