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Modem IC trims system size, power consumption

Posted: 27 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:modem IC? HART compliant? ADC?

DS8500 modem IC

From Maxim Integrated Products comes the DS8500, a single-chip, HART-compliant modem IC that enables the smallest solution size for modulating and demodulating 1.1kHz/2.2kHz FSK signals.

The device integrates an ADC and state machine to implement the digital filter required to eliminate noise from the HART signal. The built-in digital filter minimizes the number of external components while ensuring reliable signal detection in noisy industrial environments. In addition, a simple, single-pole, lowpass/highpass RC filter is all that is required externally. The DS8500 also features a low, 285?A (max) active-mode current for applications in which low power consumption is critical. Packaged in a space-saving TQFN, the DS8500 is suitable for space-constrained, 4- to 20mA current-loop applications.

The DS8500 operates from 2.7V to 3.6V and is fully specified over the -40C to +85C extended temperature range. It is available in a lead-free, 5mm x 5mm x 0.8mm, 20-pin TQFN package. Pricing starts at $4.10 (1000-up, FOB USA).

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