The ADC674A is a 12-bit successive approximation analog-to-digital converter, utilizing state-of-the-art CMOS and laser-trimmed bipolar die custom-designed 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 laser-trimmed 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 15ms maximum.Output data are available in a parallel format from TTL-compatible three-state output buffers. Output data are coded in straight binary for unipolar input signals and bipolar offset binary for bipolar input signals.The ADC674A, available in both industrial and military temperature ranges, requires supply voltages of +5V and ±12V or ±15V. It is packaged in a 28-pin plastic DIP, or hermetic side-brazed ceramic DIP.
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