The MC92307 is a pipelined Fast Fourier Transformation (FFT) processor with a blocklength of 2048 complex samples. It is especially designed for use in digital terrestrial Set-Top boxes according to the DVB-T standard for 2K transmission. One block of 2048 complex samples can be processed in 224 µs

Feature Summary

• Processing of one block of 2048 complex samples (i.e. one 2K-OFDM symbol) in 224 µs.

• Designed for direct interfacing with Motorola’s OFDM demodulator MC92308.

• Input wordlength 8 bit, output accuracy selectable between 10 and 12 bit.

• Overflow on certain OFDM subcarriers due to co-channel interferes is handled internally.

• Readout of output samples can be shifted by half the blocklength to start at the middle of the output block.

• Either multiplexed or non-multiplexed input and output format (the multiplexed mode allows direct interfacing with Motorola’s OFDM Demodulator MC92308).

• Internal Bit reversal can be disabled to allow the construction of FFT modules for blocklengths > 2K by using several devices in parallel.

• Low clock rate inputs and outputs.

• 0.5µm CMOS process at 3.3 V.

• 5 V tolerant inputs and outputs.