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TMC2272AH5C Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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TMC2272AH5C Datasheet(HTML) 6 Page - Fairchild Semiconductor |
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6 / 20 page  PRODUCT SPECIFICATION TMC2272A 6 REV. 1.1.3 10/25/00 Figure 1. Impulse Response Figure 2. Input/Output Timing 1 01 10 11 00 1.0 00 0 KAX + KBX + KCX KAY + KBY + KCY KAZ + KBZ + KCZ (K_X) (K_Y) (K_Z) 00 CLK CWSEL1,0 KA, KB, KC DATA IN A, B, C X OUT Y OUT 23 4 5 678 tCY tS tH tHO tD PREVIOUS NEW tPWL tPWH 1 CLK CWSEL1,0 KA, KB, KC X, Y, Z 23 4 5 Numeric Format and Overflow Table 2 shows the binary weightings of the input and output ports of the TMC2272A. Although the internal sums of products could grow to 23 bits, the outputs X, Y, and Z are rounded to yield 12-bit integer words. Thus the output format is identical to the input data format. Bit weighting is easily adjusted by applying the same scaling correction factor to both input and output data words. As shown in Table 2, the TMC2272A’s matched input and output data formats accommodate 0dB (unity) gain. There- fore the user must be aware of input conditions that could lead to numeric overflow. Maximum input data and coefficient word sizes must be taken into account with the specific trans- lation performed to ensure that no overflow occurs. Use with Fewer than 12 Bits The TMC2272A can be configured to provide several format and overflow options when used in systems with fewer than 12 bits of resolution. An 8-bit system will be used as an ex- ample, however these concepts apply to any other word width. The most apparent mode of operation is to left justify the in- coming data and to ground the unused input LSBs. Hoever, the outputs will still be rounded to the least significant bit of the TMC2272A, having little if any effect on the top 8 bits actually used. Because the TMC2272A carries out all calcu- lations to full precision, the preferred mode of operation is to right jusitfy and sign extend the data as shown in Figure 3. Since all the LSBs are used, the desired output will be rounded correctly, and overflow will be accommodated by bits 7 through 10. |
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