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LF2242JC25 Arkusz danych(PDF) 3 Page - LOGIC Devices Incorporated |
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LF2242JC25 Arkusz danych(HTML) 3 Page - LOGIC Devices Incorporated |
3 / 8 page DEVICES INCORPORATED LF2242 12/16-bit Half-Band Interpolating/ Decimating Digital Filter Video Imaging Products 3 08/16/2000–LDS.2242-K RND2-0 — Rounding Control The rounding control inputs set the posi- tionoftheeffectiveLSBoftheoutputdata by adding a rounding bit to the internal bit position that is one below that speci- fied by RND2-0. All bits below the effec- tive LSB position are subsequently ze- roed (Table 2). TCO — Two’s Complement Format Control The TCO input determines the format of the output data. When TCO is HIGH, the output data is presented in two’s comple- ment format. When TCO is LOW, the data is in inverted offset binary format (all output bits are inverted except the MSB — the MSB is unchanged). OE — Output Enable When the OE signal is LOW, the current data in the output register is available on the SO15-0 pins. When OE is HIGH, the outputs are in a high-impedance state. FIGURE 2. INPUT AND OUTPUT FORMATS RND2-0 SO15 SO14 SO13 SO12 • • • SO8 SO7 SO6 SO5 SO4 SO3 SO2 SO1 SO0 000 XX XX • • • X XXX XXXX R 001 XX XX • • • X XXX XXX R 0 010 XX XX • • • X XXX XX R 0 0 011 XX XX • • • X XXX X R 0 0 0 100 XX XX • • • X XXX R 0 0 0 0 101 XX XX • • • X X X R 000 00 110 XX XX • • • X X R 0000 00 111 XX XX • • • X R 0 0000 00 'R' indicates the half-LSB rounded bit (effective LSB position) TABLE 2. ROUNDING FORMAT Two’s Complement Input Format Two’s Complement Output Format (TCO = 1, Non-interpolate) Two’s Complement Output Format (TCO = 1, Interpolate) Inverted Offset Binary Output Format (TCO = 0, Non-interpolate) Inverted Offset Binary Output Format (TCO = 0, Interpolate) 10 9 8 2 1 0 11 3 –2 0 2–1 2–2 2 –8 2 –9 2–10 2 –3 2 –11 (Sign) 14 13 12 2 1 0 15 3 –2 0 2–1 2–2 2 –12 2–13 2–14 2 –3 2 –15 (Sign) 14 13 12 2 1 0 15 3 –2 1 2 0 2 –1 2 –11 2–12 2–13 2 –2 2 –14 (Sign) 14 13 12 2 1 0 15 3 2 0 2 –1 2–2 2 –12 2–13 2–14 2 –3 2 –15 (Sign) 14 13 12 2 1 0 15 3 2 1 2 0 2 –1 2 –11 2–12 2–13 2 –2 2 –14 (Sign) |
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