This HART modem includes the Digital-to-Analogue converter.Īpplication notes are here and here (Acrobat PDF format). (AMI) A5191HRTĪpplication notes are here and here (Acrobat PDF format). However, a full 20C15 data sheet is available on the Analog Services website.Īmerican Microsystems, Inc. LSI's website has no information about this product. Ask your local LSI sales office (see for latest delivery information, or call Tom Kodet at +1 (612) 921 8363. Supplies have been short, but more should be available from a new fabrication plant (in October 1999). ![]() However, in the face of continuing demand, they now plan to keep the 20C15 in production, for at least 2 years. Initially, LSI planned to make these devices obsolete. Symbios has recently been acquired by LSI Logic Corporation. The 20C15 is a newer design and includes much more and better circuitry for filtering, carrier detection and waveform shaping. These were originally the NCR 20C12 and 20C15. ![]() They operate at extremely low power, so can be used within two-wire 4-to-20mA loop-powered instruments. These are what you need to embed in a HART-speaking field device or host, if you are designing from scratch. Well, that depends on what you mean by "a HART modem".
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