TMC2242A Description
The TMC2242A and TMC2242B are fixed-coefficient linear-phase half-band (low-pass) digital filters. They can be used to halve or double the sampling rate of a digital signal. When used as a decimating post-filter with a double-speed oversampling A/D converter, they greatly reduce the cost and plexity of anti-aliasing filters required ahead of the A/D converter.
TMC2242A Key Features
- TMC2242A and TMC2242B are pin-patible with TMC2242
- User selectable interpolate gain, -6 dB or 0 dB (2242B)
- 30, 40 and 60 MHz speed grades
- User selectable 2:1 decimation, 1:2 interpolation, and equal-rate filter modes
- Passband ripple < ±0.01 dB
- Stopband rejection 59.4 dB from 0.28 to 0.50 x fs
- Cascading two TMC2242A or TMC2242B meets CCIR 601 low-pass filter requirement
- Dedicated 12-bit 2's plement input data port and 16-bit output data port with user-selectable rounding from 9 to 16 bits
- Two's plement or offset binary output format
- Built-in limiter prevents overflow