AD673

a FEATURES Complete 8-Bit A/D Converter with Reference, Clock and Comparator 30 ␮ s Maximum Conversion Time Full 8- or 16-Bit Microprocessor Bus Interface Unipolar and Bipolar Inputs No Missing Codes Over Temperature Operates on +5 V and –12 V to –15 V Supplies MIL-STD-883 Compliant Version Available VCC 5k 8-Bit A/D Converter AD673* FUNCTIONAL BLOCK DIAGRAM VSS DIGITAL COMMON CONVERT MSB DB7 DB6 8-BIT CURRENT OUTPUT DAC COMPARATOR 8-BIT SAR ANALOG IN ANALOG COMMON DB5 DB4 DB3 BIPOLAR OFFSET CONTROL INT CLOCK DB2 DB1 DB0 LSB DATA ENABLE GENERAL DESCRIPTION BURIED ZENER REF DATA READY AD673 The AD673 is a complete 8-bit successive approximation analog-to-digital converter consisting of a DAC, voltage reference, clock, comparator, successive approximation register (SAR) and 3-state output buffers—all fabricated on a single chip. No external components are required to perform a full accuracy 8-bit conversion in 20 µs. The AD673 incorporates advanced integrated circuit design and processing technologies. The successive approximation function is implemented with I2L (integrated injection logic). Laser trimming of the high stability SiCr thin-film resistor ladder network insures high accuracy, which is maintained with a temperature compensated sub-surface Zener reference. Operating on supplies of +5 V and –12 V to –15 V, the AD673 will accept analog inputs of 0 V to +10 V or –5 V to +5 V. The trailing edge of a positive pulse on the CONVERT line initiates the 20 µs conver...