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The CS5501 and CS5503 are low-cost CMOS A/D converters ideal for measuring low-frequency signals representing physical, chemical, and biological processes. They utilize charge-balance techniques to achieve 16-bit (CS5501) and 20-bit (CS5503) performance with up to 4 kHz word rates at very low cost. The converters continuously sample at a user-set rate to a CMOS clock or crystal. On-chip digital filtering processes the data and updates the output register at up to 4 kHz. The converter's low-pass, 6-pole, Gaussian response filter is designed to allow corner frequency settings from 0.1 Hz to 10 Hz in the CS5501 and 0.5 Hz to 10 Hz in the CS5503. Thus, each converter rejects 50 Hz and 60 Hz line frequencies as well as noise at spurious frequencies. The CS5501 and CS5503 include on-chip, self-calibration circuitry which can be initiated at any time or temperature to ensure offset and full-scale errors of typically less than 1/2 LSB for the CS5501 and 4 LSB for the CS5503. Each device's serial port offers two general purpose modes of operation for direct interface to shift registers or synchronous serial ports of industry-standard micro-controllers. In addition, the serial port on the CS5501 offers a third, UART-compatible mode of asynchronous communication.
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