Features and Overview
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User-programmable, mid-band gain
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User-programmable center frequency (20 Hz to 150 kHz) and Q with no external components
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Filter center frequency stability directly derived from clock accuracy
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Filter sampling rates up to 1.5 MHz
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Built in, zero-crossing detector
The BPF4 User Module implements a four-pole band-pass filter. The center frequency and Q (ratio of center frequency to bandwidth) are functions of the clock frequency and the ratios of the capacitor values chosen. The center frequency can be set accurately or adjusted by controlling the sample rate clock. Any of the classical all-pole filter configurations (Butterworth, Gaussian, Bessel, and Chebyshev) can be implemented. The filter output can drive the analog output bus.
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