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The CS5516 and CS5520 are complete solutions for digitizing low-level signals from strain gauges, load cells, and pressure transducers. Any family of mV output transducers, including those requiring bridge excitation, can be interfaced directly to the CS5516 or CS5520. The devices offer an on-chip software programmable instrumentation amplifier block, choice of DC or AC bridge excitation, and software selectable reference and signal demodulation. The CS5516 uses Delta-Sigma modulation to achieve 16-bit resolution at output word rates up to 60 Hz. The CS5520 achieves 20-bit resolution at word rates up to 60 Hz. The CS5516 and CS5520 sample at a rate set by the user in the form of either an external CMOS clock or a crystal. On-chip digital filtering provides rejection of all frequencies above 12 Hz for a 4.096 MHz clock. The CS5516 and CS5520 include system calibration to null offset and gain errors in the input channel. The digital values associated with the system calibration can be written to, or read from, the calibration RAM locations at any time via the serial communications port. The 4-bit DC offset D/A converter, in conjunction with digital correction, is initially used to zero the input offset value.
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