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CMOS IC acts as analog front end

Posted: 19 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:protek analog? cmos monolithic ic? sentinel?

ProTek Analog released a mixed-signal CMOS monolithic device that integrates analog-to-digital converter conversion operations on a single chip.

Flexible, programmable and host-independent, the Sentinel acts as a low-frequency analog front-end for applications involving lighting, sensor interfaces, feedback controls, instrumentation, medical electronics, computer peripherals and data acquisition systems.

The Sentinel requires a digital controller to operate, but may or may not need additional memory depending on the application. Unlike competing devices, the Sentinel is not limited to a particular type of controller. The digital controller can be a microprocessor, microcontroller, CPLD, FPGA, discrete logic or PC.

The Sentinel provides a robust, cost-effective solution for low power A/D conversion applications, said M.A. Rehman, Protek's CTO. "The Sentinel is the first host-independent analog front-end designed to multiplex multiple sensors and/or sources," he said.

The device measures both current and voltage outputs, and provides a built-in multiplexer to interface to up to six different sensors at the same time. This capability eliminates the need for external multiplexers, as well as signal conversion functions that add cost and complexity to the user's system.

The Sentinel features low operating voltage and frequency (fosc=2MHz, 4.5V to 5.5V), dual 50mA current source, on-chip voltage regulator, up to six current outputs (D/A channel), and low power consumption. The device provides dual 8bit programmable current sources, as well as a clock oscillator for timing purposes, voltage reference, preconditioning amplifier, sample and hold, and a 10bit A/D converter.

A register file containing six real registers is used for programming the current sources. Two additional registers enable trimming of the clock oscillator and the on-time of current sources.

Available in a SOIC 16-pin package, QFN, or as a die for direct chip-on-board mounting, the Sentinel and its complete system (digital controller and memory) can also be delivered as a multi-chip system in a package (MSP).

Pricing is $2.50 each in 10,000-piece quantities.

- Bettyann Liotta


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