SPT774

SPT774 FAST, COMPLETE 12-BIT µP COMPATIBLE A/D CONVERTER WITH SAMPLE/HOLD FEATURES Improved Higher Performance Version of the HADC574Z Complete 12-Bit A/D Converter with Sample/Hold, Reference and Clock Low Power Dissipation (120 mW Max) 12-Bit Linearity (Over Temp) 8 µs Max Conversion Time Single +5 V Supply Full Bipolar and Unipolar Input Range APPLICATIONS Data Acquisition Systems 8 or 12-Bit µP Input Functions Process Control Systems Test and Scientific Instruments Personal Computer Interface GENERAL DESCRIPTION The SPT774 is a complete, 12-bit successive approximation A/D converter manufactured in CMOS technology. The device is an improved version of the HADC574Z. Included on chip are an internal reference, clock, and a sample-and-hold. The S/H is an additional feature not available on similar devices. The SPT774 features 8 µs (max) conversion time of 10 or 20 V input signals. Also, a three-state output buffer is added for direct interface to an 8-, 12- or 16-bit µP bus. The SPT774 has standard bipolar and unipolar input ranges of 10 V and 20 V that are controlled by a bipolar offset pin and laser trimmed for specified linearity, gain and offset accuracy. The power supply is +5 V. The device also has an optional mode control voltage which may be used depending on the application. With a maximum dissipation of 120 mW at the specified voltages, power consumption is about five times lower than that of currently available devices. The SPT774 is ava...