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GC2011A Datasheet(PDF) 21 Page - Texas Instruments |
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GC2011A Datasheet(HTML) 21 Page - Texas Instruments |
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21 / 50 page  Texas Instruments Incorporated - 17 - GC2011A 3.3V DIGITAL FILTER CHIP SLWS129A This document contains information which may be changed at any time without notice 3.5 DECIMATION A common filtering operation is to low pass filter the input signal and then to reduce (decimate) its sample rate by a factor of two or four. The sample rate reduction is performed by only calculating every other or every fourth output sample. This allows the number of taps in the filter to be doubled or quadrupled. Table 5 shows the control register settings for the decimation modes. The decimate by two filter coefficients should be designed with a passband between 0 and FS/4 and a stopband from FS/4 to FS/2, where FS is the input data rate. The decimate by 4 filter (full rate in to quarter rate out) filter should be designed with a passband between 0 and FS/8 and a stopband above FS/8. The filter coefficients for the decimation modes are stored using the registers described for half rate or quarter rate operation. The decimation modes which result in half rate output samples use the half rate mode coefficient registers as described in Section 3.2. The quarter rate outputs use the quarter rate coefficient storage as described in Section 3.3. Table 6: Decimation Mode Control Register Settings I/O Rates Symmetr y Dual Path or Cascaded # of Taps (N) A-PATH B-PATH Cascade Latency Tap Storagea a. HR = Use half rate coefficient storage as described in Section 3.2. QR = Use quarter rate storage as described in Section 3.3. In Out REG0 REG1 REG0 REG1 REG Full Half None Dual 32 208B 2E00 008B 2E00 2000 46 HR Cascaded 64 208B 2E28 008B 2E00 5E00 62 Even Dual 64 208B 2E12 008B 2E12 2000 46 Cascaded 128 208B 2E28 008B 2E12 5E00 62 Odd Dual 63 208B 2E91 008B 2E91 2000 46 Cascaded 127 208B 2EA8 008B 2E91 5E00 62 Quar- ter None Dual 64 2002 0200 0002 0200 2000 50 QR Cascaded 128 2002 0228 0002 0200 5E00 66 Even Dual 128 2002 0214 0002 0214 2000 50 Cascaded 256 2002 0228 0002 0214 5E00 66 Odd Dual 127 2002 0292 0002 0292 2000 50 Cascaded 255 2002 02A8 0002 0292 5E00 66 |
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