Product category:
Board-Level Instruments
News Release from: Hardent | Subject: ADC
Edited by the Electronicstalk Editorial
Team on 29 April 2005
Analogue input board boasts maximum
performance
New from Hardent, the ADC features eight differential analogue inputs capturing signals in the range of +/-10V at up to 100Ksample/s per channel with 14bit resolution.
The ADC is a high-speed analogue/digital convertor offering maximum performance With eight differential analogue inputs capturing signals in the range of +/-10V, simultaneous sampling of up to 100Ksample/s per channel (800Ksample/s aggregate) at a resolution of14bit is achieved
This article was originally published on Electronicstalk on 17 Feb 2005 at 8.00am (UK)
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Each input is buffered with a high input impedance differential amplifier, enabling the rejection of common-mode noise present on the differential inputs.
Lowpass analogue input filtering is accomplished using two cascaded one-pole filters.
A FIFO buffer provides onboard storage for 1024 samples (for a maximum of 128 samples per channel).
The memory used to store the ADC samples is divided into two banks - while one is being written with samples the other is made available for reading via the PC/104 interface.
When the memory buffer threshold (user-selected) is reached, an interrupt to the CPU is generated and the banks are switched.
The ADC offers different sampling modes for maximum flexibility in addressing different data acquisition scenarios.
The four modes provided are: one-shot, one-shot multiple, programmable and continuous.
The "one-shot multiple" mode allows N samples to be acquired after a single trigger event, while the "programmable" mode allows the acquisition of N samples to be repeated indefinitely using a user-selectable repeat interval.
Channels can be enabled/disabled on an individual basis, and the conversion process can be triggered either by a software command or by an externally generated TTL-level signal.
A similar output signal is provided for synchronisation of a second ADC.
Although targeted at industrial sensing and control applications, this product can be used in many diverse applications.
Some examples include: simultaneous data acquisition for destructive testing; closed-loop control; phase current monitoring for vector motor control; phase current monitoring for multiphase motor control; power measurements; power-factor measurements; vibration analysis; and waveform analysis.
The ADC is also ideal for other real-time DSP applications which require precision multichannel measurements which are phase-aligned.
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