AD774B*

Complete Monolithic 12-Bit A/D Converters with Reference, Clock, and Three-State Output Buffers
Industry Standard Pinout
High Speed Upgrades for AD574A
8- and 16-Bit Microprocessor Interface
8 s (Max) Conversion Time (AD774B)
15 s (Max) Conversion Time (AD674B)
±5 V, ±10 V, 0 V10 V, 0 V20 V Input Ranges
Commercial, Industrial, and Military Temperature Range Grades
MIL-STD-883-Compliant Versions Available

The AD674B and AD774B are complete 12-bit successiveapproximation analog-to-digital converters with three-state output buffer circuitry for direct interface to 8- and 16-bit microprocessor busses. A high-precision voltage reference and clock are included on chip, and the circuit requires only power supplies and control signals for operation.

The AD674B and AD774B are pin-compatible with the industry standard AD574A, but offer faster conversion time and busaccess speed than the AD574A and lower power consumption.The AD674B converts in 15 s (maximum) and the AD774B converts in 8 s (maximum).

The monolithic design of AD674B and AD774B is implemented using Analog Devices'BiMOS II process allowing high-performance bipolar analog circuitry to be combined on the same die with digital CMOS logic. Offset, linearity, and scaling errors are minimized by active laser trimming of thin-film resistors.

Five different grades are available. The J and K grades are specified for operation over the 0°C to 70°C temperature range. The A and B grades are specified from 40°C to +85°C, the T grade is specified from 55°C to +125°C. The J and K grades are available in a 28-lead plastic DIP or 28-lead SOIC. All other grades are available in a 28-lead hermetically sealed ceramic DIP.