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SPT774CCS Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 12 page 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 de- vice 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 available in 28-lead ceramic sidebrazed DIP, PDIP and SOIC packages in the commercial temperature range. BLOCK DIAGRAM Three-State Buffers And Control Nibble A Nibble B Nibble C 12-Bit SAR + - Comp Clock Offset/Gain Trim Control Logic 12-Bit Capacitance DAC STS AoCE AGND 20 V In 12/8 CS R/C Ref Ref Out 10 V In BIP Off Output Signal Processing Technologies, Inc. 4755 Forge Road, Colorado Springs, Colorado 80907, USA Phone: (719) 528-2300 FAX: (719) 528-2370 Website: http://www.spt.com E-Mail: sales@spt.com |
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