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I have an off-chip filter and pre-amp circuit (see figure) that I would like to interface with the PSoC 3/5's ADC. This circuit buffers, bandpass filters (500 Hz–5 kHz by a four-pole multiple feedback Butterworth filter) and amplifies (1500×) biological signals (microvolt amplitudes).
Could I use PSoC's components (opamp, etc) to save space on my final board layout? This will be a low power (3V or less) design requiring 2-3 day battery life.