ADC574A

® ADC574A FPO Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER FEATURES q COMPLETE 12-BIT A/D CONVERTER WITH REFERENCE, CLOCK, AND 8-, 12-, or 16BIT MICROPROCESSOR BUS INTERFACE q IMPROVED PERFORMANCE SECOND SOURCE FOR 574A-TYPE A/D CONVERTERS Conversion Time: 25µs max Bus Access Time: 150ns max AO Input: Bus Contention During Read Operation Eliminated q DUAL IN-LINE PLASTIC, PLCC AND HERMETIC CERAMIC q FULLY SPECIFIED FOR OPERATION ON ±12V OR ±15V SUPPLIES q NO MISSING CODES OVER TEMPERATURE: 0°C to +75°C: ADC574AJ and K Grades –55°C to +125°C: ADC574ASH, TH for freedom from latch-up and for optimum AC performance. It is complete with a self-contained +10V reference, internal clock, digital interface for microprocessor control, and three-state outputs. The reference circuit, containing a buried zener, is lasertrimmed for minimum temperature coefficient. The clock oscillator is current-controlled for excellent stability over temperature. Full-scale and offset errors may be externally trimmed to zero. Internal scaling resistors are provided for the selection of analog input signal ranges of 0V to +10V, 0V to +20V, ±5V, and ±10V. The converter may be externally programmed to provide 8- or 12-bit resolution. The conversion time for 12 bits is factory set for 25µs maximum. Output data are available in a parallel format from TTLcompatible three-state output buffers. Output data are coded in straight binary for unipolar input signals and bipolar offset binary for bipolar inp...