AD688:  High Precision ±10 V Reference

The AD688 is a high precision ±10 V tracking reference. Low tracking error, low initial error and low temperature drift give the AD688 reference absolute ±10 V accuracy performance previously ...More

AD688:  High Precision ±10 V Reference

Product Description

The AD688 is a high precision ±10 V tracking reference. Low tracking error, low initial error and low temperature drift give the AD688 reference absolute ±10 V accuracy performance previously unavailable in monolithic form. The AD688 uses a proprietary ion-implanted buried Zener diode, and laser-wafer-drift- trimming of high stability thin-film resistors to provide outstanding performance at low cost.

The AD688 includes the basic reference cell and three additional amplifiers. The amplifiers are laser-trimmed for low offset and low drift and maintain the accuracy of the reference. The amplifiers are configured to allow Kelvin connections to the load and/or boosters for driving long lines or high current loads, delivering the full accuracy of the AD688 where it is required in the application circuit.

The low initial error allows the AD688 to be used as a system reference in precision measurement applications requiring 12-bit absolute accuracy. In such systems, the AD688 can provide a known voltage for system calibration and the cost of periodic recalibration can therefore be eliminated. Furthermore, the mechanical instability of a trimming potentiometer and the potential for improper calibration can be eliminated by using the AD688 and calibration software.

The AD688 is available in three versions. The AD688AQ and BQ grades are packaged in 16-pin cerdip (0.3") packages and are specified for operation from -40°C to +85°C. The AD688SQ grade is specified for operation from -55°C to +125°C.

Features

  • ±10 V tracking outputs
  • Kelvin connections
  • Low tracking error: 1.5 mV
  • Low initial error: 2.0 mV
  • Low drift: 1.5 ppm/°C
  • Low noise: 6 µV p-p
  • Flexible output force and sense terminals
  • High impedance ground sense
  • Wide body SOIC and CERDIP packages

Diagrams

AD688 Diagram
Functional Block Diagram for AD688

Specifications

Vout 10
Initial Accuracy (%) 0.02
Ref Out TC (ppm/C) 1.5ppm/C
Supply Voltage Range (V) Vdd-Vss = (Vout+2) to 36
Supply Current (max) 12mA
Ref Output Current (mA) 10mA
0.1-10 Hz Noise (µV p-p) 6µV p-p
Temp Range(s) -40 to +85,-55 to +125
Package DIP,SOIC
Reference Type Series-Multi/Select Out

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