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TMSx70 ADC source impedance

Posted: 06 Sep 2010     Print Version  Bookmark and Share

Keywords:ADC  source impedance  TMSx70 ADC 

Unbuffered multiplexed ratio-metric ADCs have strict requirements on driving source impedance that are not always obvious. This application report addresses the trade-offs between source impedance and sample rate. It includes both 10bit and 12bit examples using the TMS570 and TMS470 family of processors in the GS30, GS40 and GS60 process nodes, i.e. F05/C05, F035/C035 and F021, respectively.

Unbuffered multiplexed ratio-metric ADCs are commonly used in microprocessors due to their simplicity of design and inherent absence of circuits that need trimming in production. Both multiplexed and unmultiplexed versions are commonly found in discrete form, and are probably the most common ADCs in existence. They have no internal buffer amplifiers to introduce input offset and gain errors, and no internal voltage references that might induce scaling errors.

Designers are accustomed to using these ADCs for a variety of low-frequency applications. Over the last two decades, they have been included in virtually every microprocessor family from every company and have increased in conversion speed right along with the microprocessors that host them.

View the PDF document for more information.





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