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Programmable Devices
Embedded Digital Filtering on Programmable Mixed-Signal Devices Programmable hardware resources that can run in parallel on the same chip with a CPU can make implementing mixed-signal solutions simpler, more cost-effective and flexible without interfering with other real-time tasks managed by the CPU.
by Kendall Castor-Perry, Cypress Semiconductor
T
he increasing availability of afford- mixed-signal microcontrollers because able microcontrollers with analog- they make it possible to cost-effectively to-digital front ends continues to implement complex digital filtering in a change how embedded systems are being wide range of new applications. More addesigned. Often termed “mixed-signal vanced filtering allows engineers to offer microcontrollers,” these devices consoli- more capabilities—including higher predate both control and digital signal processing functionality onto a single device. V[ch1] V[ch2] 500mV Such programmable “system on chip” technology not only simplifies application 400mV nies providing solutions nowit accelerates development architectures, 300mV ion into products, technologies andthe companies. Whether your goal is to research the latest by eliminating need to communicate ation Engineer, or jump to a company's technical page, the goal of Get Connected is to put you between chips, and by enabling engineers 200mV you require for whatever type of technology, application code within a single and productstoyouwrite are searching for. 100mV development environment. One of the primary advantages of 0mV mixed-signal microcontrollers is that they -100mV can do much more than simply convert -200mV external analog signals to the digital domain. Data acquisition is not an end in it-300mV self but rather a first step before extracting -400mV the meaning behind acquired data, and deciding what to do with it. Many em-500mV 4.250s 4.255s 4.260s 4.265s 4.270s bedded developers are turning to newer
cision, better efficiency and lower power consumption—with which to differentiate their products. Bringing digital signal processing and control functionality onto the same device, however, does not come without V[ch3]
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Figure 1 Four sequentially multiplexed inputs of an ADC are fed the same signal...
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