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Mazet has introduced an MDDC 4-channel sensor signal amplifier, which converts small input currents across a high bandwidth and dynamic range and digitises them on chip via a transimpedance amplifier.

Transimpedance amplifiers are preferred in industrial measurement technology for their rapid and cyclic conversion and amplification of the very small currents used in optoelectronic sensors.

The ASIC MDDC is suitable for fast, multi-sensor applications with minimal sensor current, in conjunction with detectors and arrays, such as In-Line (Colour) Measurement and control in automated processes, such as printing and analysis.

The transimpedance (gain) is independently programmable digitally for each channel above five bits in 16 stages via the SPI interface.

The gradation between the transimpedance per channel is implemented in binary with additional intermediate stages in the range of about 1.6 to 100MOhm.

At the maximum transimpedance, even currents in the nA range can be quickly measured and a dynamic range of 30dB (from 11.7 nA to 2uA; LSB down to 2.8pA) covered.

The amplifier stages are characterised by low noise levels and operate with high linearity and synchronism of the channels.

Beyond the external programming of the amplifier stages, dynamic in-line amplification on all channels is also available separately in the operation.

The ASIC MDDC includes internally a 12-bit A/D conversion on-chip, which works as a successive approximation A/D converter.

Also implemented in the A/D converter is a procedure for temperature modulation, which compensates as far as possible for the large temperature variation in the transimpedance of the current-voltage converter.

The reference programming for the conversion (equivalent to a reference voltage for a conventional A/D voltage converter) can be regulated through the programming of the transimpedance.

This is done independently for each channel.

Thus, each channel can have its own reference current or current range (Full Scale Range – FSR).

All necessary references are implemented internally.

A kind of ‘Track and Hold’ circuit with a four-to-one multiplexer is emplaced before the A/D converter, allowing for simultaneous parallel sampling and subsequent serial conversion of the analogue values of the channels.

Communication to and from the ASIC is realised through a bi-directional 12-bit SPI interface with a clock up to 16MHz, which is used simultaneously for the A/D converter.

A conversion time of 1s per channel and thus a sampling rate of up to 100kS/s for all four channels can be achieved this way.

The MDDC 4-channel current-to-digital converter is very suitable for multi-sensor applications with minimal sensor current.

They are typically colour sensors and other optical arrays and lines (UV, VIS, NIR, IR-range) in high-speed applications, such as industrial sensors (light grid, length, level, position, thickness and clearance measurement), in dynamic measurement systems for surface analysis (spectral and colour measurements, gloss, roughness), temperature measurement (thermal imaging, combustion monitoring) but also with in-line detectors for alpha-, beta-and gamma-rays, X-rays and ions.

The ASIC sensors are available in SMD housing or can be ordered as a naked chip for subsequent hybrid or MCM-processing.

In connection with the Mazet True Colour Sensors, the amplifiers are available as full-colour sensor modules or SMD sensor components.

Customer satisfaction, the satisfaction of our own workforce and lasting mutual business success is what we strive for.

The development and manufacture of custom- and application-engineered chips, boards and software using advanced technologies, as well as optoelectronics, represent our core operations.

Our target areas are medical engineering, automation engineering, industrial metrology, and optoelectronic applications.

High quality and delivery reliability are the driving forces of Mazet employees. Certified procedures are in place to guarantee the customer gapless traceability of processes from development through to the manufacture of electronic modules, creation of software or integrated circuits. An established document and data management system ensures that engineering design and manufacturing data is readily available for as long as the customer requires. 

Quality conformity at all phases guarantees the delivery of quality assured services. Mazet uses a quality management system under DIN EN ISO 9001 : 2000 for all of its operational procedures, thus ensuring the highest quality at any given process step.

'Our goal is success through your satisfaction': this is the quality philosophy of any Mazet employee. Consistently ongoing improvement of the quality of products and processes is part of the company's strategy. It relies on a permanent qualification program for employees at all levels, a process management system to optimise work procedures and on investments in all necessary equipment.

Mazet takes on the challenge of defining quality targets, including for new developments, and continuously monitoring fulfillment. The efforts for improvement in quality and output are supported by the social commitment of the senior management.

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