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TMC2242C Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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TMC2242C Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 13 page PRODUCT SPECIFICATION TMC2242C 7 Table 3a. Input Data Formats and Bit Weighting Table 3b. Output Data Formats and Bit Weighting Notes: 1. Inverted offset binary is the same as unsigned, except that all bits are complemented. 2. In -6 dB interpolation modes, the two’s complement sign bit is replicated in SI15 and SI14. 3. In -6 dB interpolation mode, the unsigned MSB is preceded by a 0 in SO15. 4. A leading minus sign denotes the two’s complement sign bit. 5. In all operating modes except “interpolate -6 dB,” dc gain is exactly unity. Table 4. Rounded LSBs as a function of RND2-0 Note: 1. The “r” indicates that the trailing significant output bit has been rounded to the nearest 1/2 LSB. All output drivers at and below the rounding bit are disabled, allowing the lower output bits to be used as control inputs. 2. If SO1 = 1, format is 8 bits, viz: SO15…SO8r z…z. Table 5. Steady-State Output Values and Limit Triggers Notes: 1. Full-scale values are minima and maxima permitted by on-chip limiter. Transient overshoots arising from large input signal transitions will be clipped to these limits. Format SI11 SI10 S9 . . . SI1 S0 Two’s Comp. -20 2-1 2-2 . . . 2-10 2-11 Unsigned 20 2-1 2-2 . . . 2-10 2-11 Format SO15 SO14 SO13 . . . SO5 SO4 Two’s Comp. -20 2-1 2-2 . . . 2-10 2-11 Unsigned1 20 2-1 2-2 . . . 2-10 2-11 -6 dB t.c.2 -20 -20 2-1 . . . 2-9 2-10 -6 dB Unsgn3 020 2-1 . . . 2-9 2-10 RND2-0 SO15 SO14 SO13 …SO8 SO7 SO6 SO5 SO4 SO3 SO2 SO1 SO0r 000 SO15 SO14 SO13 …SO8 SO7 SO6 SO5 SO4 SO3 SO2 SO1r z 001 SO15 SO14 SO13 …SO8 SO7 SO6 SO5 SO4 SO3 SO2r z z 010 SO15 SO14 SO13 …SO8 SO7 SO6 SO5 SO4 SO3r zzz 011 SO15 SO14 SO13 …SO8 SO7 SO6 SO5 SO4r zzzz 1002 SO15 SO14 SO13 …SO8 SO7 SO6 SO5r zzzzz 101 SO15 SO14 SO13 …SO8 SO7 SO6r zzzzzz 110 SO15 SO14 SO13 …SO8 SO7r zzzzzzz 111 Input Interpolate -6 dB All Other Modes Interpretation Unsigned 2’s Comp. Unsigned 2’s Comp. Unsigned 2’s Comp. Unsigned 2’s Comp. FFF 7FF 7FF81 3FF81 FFF01 7FF01 full-scale full-scale + C00 400 6000 2000 C000 4000 3/4-scale 1/2 scale + 801 001 4008 0008 8010 0010 1 LSB + 800 000 4000 0000 8000 0000 1/2-scale Zero 7FF FFF 3FF8 FFF8 7FF0 FFF0 1 LSB – 400 C00 2000 E000 4000 C000 1/4-scale 1/2-scale – 000 800 00001 C0001 00001 80001 zero full-scale – |
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