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The KAD/ADC/117 has eight channels of signal conditioning and data acquisition for differential voltages, strain gage, and bridge measurements. In addition to the measurement channel, the KAD/ADC/117 provides independent constant current excitation for up to eight channels. Each differential-ended signal has a separate programmable amplifier, filter, and A/D converter.
At the heart of the KAD/ADC/117 is a hard-wired state machine that over-samples all channels at a rate between 96 ksps and 192 ksps and digitally filters any noise above the user-programmable cutoff frequency. This is achieved using cascaded, half-band, decimate by 2, 15 tap, Finite-Impulse-Response (FIR) filters with 32-bit coefficients followed by 8th order Butterworth (IIR) filter with a default cutoff point set to a quarter of the sampling frequency. All signals are sampled simultaneously. Thus, when several channels are sampled at different sampling rates, at least at the start of an acquisition cycle all channels will be aligned.
The excitation current is programmable (0 mA to 2 0mA in 5 µA steps) and is kept constant. As the resistance changes, the voltage across the bridge (and hence as seen by the amplifier) changes linearly.
- Eight full bridge or differential ended input channels
- Programmable input range (±10mV to ±10V)
- Programmable current excitation
- Short on any channel does not affect others
- 16-bit simultaneous sampling on each channel
- Up to 24 k samples per second per channel
- Up to 6 kHz Bandwidth (AAAF filter)
- Analog signal Acquisition
- Differential Ended
- Full Bridge
- Half Bridge