HT574

The HT574 is a general purpose, 12-bit successive approximation A/D converter intended for applications with an extremely wide operating temperature range. Fabricated with Honeywell's dielectrically isolated high temperature (HTMOS™) process, it is designed specifically for severe high-temperature applications.

The HT574 includes a switched capacitor, digital-to-analog converter, internal reference, comparator, successive approximation register, sample and hold, oscillator and architecture which allows it to be used with minimal external components. Tristate output buffers and digital control pins are also provided for microprocessor interfacing. Analog input signal ranges of 0 to +10V, 0 to +20V, or ±5V may be selected from the internal resistor scaling network.

The HT574 provides 12-bit conversions in 10ms over the entire -55 to +225°C temperature range. Typically, parts will operate up to +300°C for a year, with derated performance. All parts are burned in at 250°C to eliminate infant mortality.