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TMC2242A

Fairchild Semiconductor
Part Number TMC2242A
Manufacturer Fairchild Semiconductor
Description Digital Half-Band Interpolating/Decimating Filter
Published Apr 16, 2005
Detailed Description www.fairchildsemi.com TMC2242A/TMC2242B Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz ...
Datasheet PDF File TMC2242A PDF File

TMC2242A
TMC2242A

Overview
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.
When used as an interpolating pre-filter with a double-speed oversampling D/A converter, the TMC2242A and TMC2242B significantly reduce the design complexity and production cost of reconstruction filters used on D/A outputs.
The TMC2242A and TMC2242B user selects the mode of operation (decimate, interpolate, or equal-rate) and rounding.
The TMC2242A and TMC2242B accept 12-bit 2's complement data at up to 60 MHz and output saturated (overflow-protected) 2's complement or offset binary data rounded ...


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