AS89020 high performance needs great design Datasheet
Transimpedance amplifiers (TIA) used as current-voltage converters ensure continuous signal processing at high signal frequencies, thus meeting the demands of e.g. automated processes. They are best suited to synchronous measuring procedures in the kilohertz range, where fast converters are required to scan optical signals. Examples include sensors for quality testing in inline manufacturing processes or those in touchless handheld devices.ams Sensors Germany offers several multichannel TIAs with digital and analog interface.
The AS89020 is a12bit, 4 channel, current input analog-to-digital converter (ADC). It combines current-to-voltage (TIA) and analog-to-digital (AD) conversion, so that 4 separate current output devices (e.g.photodiodes) can be directly connected to its inputs and digitized.
For each of the 4 inputs the AS89020 provides an input amplifier with a track and hold circuit. The outputs of the track and hold stages are serial converted to 12bit digital words using an analog-to-digital converter (ADC).
The 12bit conversion results are available via SPI at a frequency up to 16MHz and a conversion time as lowas1μs per channel.
The input amplifier is separately programmable for each channel in 17 stages. This results in a programmable full-scale range for the ADC from 11.7nA to 12μAand a sensitivity up to 2.8pA/LSB.
Input currents of both polarities can be fed to each of the input amplifiers. The adjustment is realized by digital programming of each channel separately via standard SPI-interface.
All reference voltages are implemented internally;only some external passive devices are needed to complete their operating mode.
The AS89020supports Power Down functions for low power solutions.
Based on the high flexibility the AS89020is suitable as a converter for a wide range of multi-channel opto electronic sensors (UV, VIS, NIR, IR) or other sensors with current output. The device achieves a high dynamic range.
The combination of ams Sensors Germany’s color sensors with AS89020is excellently suited especially for fast color measurement and control in printing and automation, for mobile color measurement devices but also for photometry applications (brightness, color coordinate and/or color temperature), for determining current values for control of spectrally mixed LED light sources or as sensors for display and (back)light calibration and mobile devices for light measurement.
The sensor compact signal IC is available in a SSOP20 package and or as bar die on request.
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Datasheet |
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Please see the document for details |
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SSOP20 |
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English Chinese Chinese and English Japanese |
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2017 - 07 - 06 |
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V3.01 |
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db09284e |
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2.2 MB |
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