AT76C001 datasheet pdf

AT76C001 CBIC Programmable FIR Filter AT76C001 Features • 4 Multiplier-Accumulators • 40 Bits Accuracy • 16 Bit Data and Coefficients • 4-tap Filter With 27 MHz Sample Rate • Programmable to Give up to 256 Taps With Sampling Reducing Proportionally to 421,875 kHz • Programmable Rounding and Truncation to 16 Bit • 8 Bit Standard Microprocessor Interface • 64-pin PQFP, 68-pin PGA68 or 68-pin LCC68 Packaging Description The AT76C001 Programmable Finite Impulse Response (FIR) Filter implements a 4th order FIR cell built around 4 multiplier-accumulators. It contains a dual-port RAM and a RAM which are used to implement FIR filters of up to 256 taps. High or- der filters are achieved by multiplexing the 4th order cell and accumulating the inter- mediate results up to 40 bits, so that there is no loss of accuracy. The maximum frequency of the AT76C001 is 27 MHz. For 4-tap FIR filter, the in- coming sample rate can be as high as 27 MHz. For higher order FIR filters, the sample rate can be as high as the circuit frequency divided by the 4th order cell mul- tiplexing factor. A programmable normalization block allows the choice of the 16 significant bits from the 40 bit internal result which can be previously rounded by adding 0.5 LSB accord- ing to the 16 significant bit locations. The AT76C001 has a microprocessor inter- face which can be configured to be Intel or Motorola compatible. Applications • Digital Filters (video, audio, etc.) • Correlation • Image Processing

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