PRODUCT DESCRIPTION 

The AD574A is a complete 12-bit successive-approximation analog-to-digital converter with 3-state output buffer circuitryfor direct interface to an 8-or 16-bit microprocessor bus.A high precision voltage reference and clock are included on-chip, andthe circuit guarantees full-rated performance without external circuitry or clock signals.The AD574A design is implemented using Analog Devices'Bipolar/I2L process, and integrates all analog and digital func-tions on one chip. Offset, linearity and scaling errors are mini-mized by active laser-trimming of thin-film resistors at the wafer stage. The voltage reference uses an implanted buried Zener for low noise and low drift. On the digital side, IPL logic is used for the successive-approximation register, control circuitry and 3-state output buffers.

FEATURES 

- Complete 12-Bit A/D Converter with Reference and Clock

- 8-and 16-Bit Microprocessor Bus Interface 

- Guaranteed Linearity Over Temperature 0℃to+70℃-AD574AJ,K,L -55℃to+125℃-AD574AS,T,U 

- No Missing Codes Over Temperature

- 35 us Maximum Conversion Time 

- Buried Zener Reference for Long-Term Stability and Low Gain T.C.10 ppm/℃ max AD574AL 12.5ppm/℃ max AD574AU

- Ceramic DIP, Plastic DIP or PLCC Package Available in Higher Speed, Pinout-Compatible Versions (15μS AD674B,80uS AD774B;10 us(with SHA) AD1674)

- Available in Versions Compliant with MIL-STD-883 and JAN QPL