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The KAD/ADC/135 is used to condition and digitize up to 12 differential-ended analog channels using simultaneous sampling 16-bit A/D for each channel. At the heart of the KAD/ADC/135 is a hard-wired state machine that oversamples all channels at a rate between 100 ksps and 200 ksps and digitally filters any noise above the user-programmable cutoff frequency.
This is achieved using cascaded, half-band, 15-tap, Finite-Impulse-Response (FIR) Kaiser window filters followed by an 8th order Butterworth IIR filter with a default cutoff point set at one-quarter of the sampling frequency (fc = fs / 4). The IIR filter is bypassed in FIR mode with samples output directly from the FIR filter. All signals are sampled simultaneously. When several channels are sampled at different sampling rates, at the start of an acquisition cycle all channels are aligned.
The KAD/ADC/135 supports programmable primary gain, excitation type(current or voltage, with compliance up to 30 mA / ±5.1V), digital filter type as well as completion resistors and high accuracy. Unlike other analog modules, the maximum input voltage range is limited to ±2.5V.
Features
- 12 full or ½-bridge, potentiometer or differential ended input channels
- Programmable input range (±20mV to ±2.5V)
- High accuracy (0.02% FSR typical)
- Programmable current or voltage excitation per 3 channels and balance adjust per channel
- Shorts only affect channels sharing excitation
- 16-bit simultaneous sampling on each channel
- Completion resistors for ½-bridge configuration
- Up to 25K samples per second per channel
- Up to 6.25kHz bandwidth
Applications
- Analog signal Acquisition
- Differential Ended
- Full Bridge
- Half Bridge
- Potentiometer
KAD/ADC/135