TMC2242A

www.fairchildsemi.com TMC2242A/TMC2242B Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz Features TMC2242A and TMC2242B are pin-compatible 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 complement input data port and 16-bit output data port with user-selectable rounding from 9 to 16 bits Two's complement or offset binary output format Built-in limiter prevents overflow Single +5 Volt power supply operation Small 44-Lead PLCC and 44-Lead MQFP Applications Low-cost video filtering Chrominance bandwidth limiter Simple, inexpensive video D/A post-filters Reduced cost and complexity for A/D anti-aliasing filters High-performance digital low-pass filters Digital waveform reconstruction post-filtering Telecommunications Direct digital synthesis Radar 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 complexity of anti-aliasing filters required ahead of the A/D converter...