Multi-channel Sensor

Each channel of the transimpedance amplifier is independently digitally programmable at 16 stages via 5 bits of its SPI interface. Gradation of transimpedance per channel is implemented binarily with additional intermediate levels in the 1.6MΩ to 100MΩ band. At maximum transimpedance, fast current measurement is possible in the nA range with a dynamic range of 30dB. The transimpedance amplifier stages are characterised by low noise. They respond in a highly linear manner with channel synchronism. External programming of the amplifier stages allows for independent dynamic inline amplification across all channels in ongoing operations.

The MDDC comprises a 12 bit on chip A/D converter which works on the successive
approximation principle. The effect of temperature fluctuations on signal
processing is compensated to a great extent.

All required reference sources are implemented on chip and can be programmed
externally via the serial interface.

The S&H function supports parallel sampling with successive conversion of the
analog values from the channels.

Communication between the MDDC and the downstream controller is implemented by
means of a 12 bit SPI interface with a clock speed of up to 16MHz. The SPI clock
speed is also used for the A/D converter. This allows for a conversion time of 1µs
per channel or a sampling rate of up to 100kS/s for each of the four channels.

The 4-channel MDDC sensor signal IC is perfectly suited for multiple sensor
applications with exacting precision requirements. Applications include optical
sensors (colour sensors and optical arrays) as well as inline detectors for α, β
and γ- rays, xrays and ions. The sensor signal IC is available in an SMD housing or
can be provided as a naked chip for downstream hybrid or MCM processing. MAZeT
offers a True Color Sensor IC with digital output whose signal processing
capabilities are based on the MDDC.