AD688It is a high-precision ± 10 V trackingVoltage reference。 The device's low tracking error, low initial error, and low temperature drift result in unprecedented single-chip absolute ± 10 V accuracy. It uses proprietary ion-implanted embedded Zener diodes and laser wafer drift adjustment of highly stable thin-film resistors, resulting in excellent performance at a lower cost.
The AD688 contains a basic reference and three additional amplifiers. These amplifiers are laser trimmed to have low offset and drift and maintain the accuracy of the reference. The amplifier configuration allows a Kelvin connection to the load and/or booster to drive long line or high current loads, providing all the AD688 accuracy required for the application circuit.
The low initial error of the AD688 makes it suitable as a system reference for precision measurement applications requiring 12-bit absolute accuracy. In this system, the AD688 provides a known voltage for system calibration, thus eliminating the cost of periodic recalibration. In addition, using the AD688 with calibration software eliminates mechanical instability and improper calibration of the adjustment potentiometer.
The AD688 is available in three variants. The AD688 AQ and BQ grades are available in 16-lead CERDIP (0.3") packages and are specified over the -40°C to +85°C temperature range. The AD688SQ grade is specified for operation over the -55°C to +125°C temperature range.