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AD688 Datasheet(PDF) 3 Page - Analog Devices |
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AD688 Datasheet(HTML) 3 Page - Analog Devices |
3 / 8 page ![]() AD688 REV. A –3– ORDERING GUIDE Part Initial Temperature Temperature Package Number 1 Error Coefficient Range - C Option 2 AD688AQ 5 mV 3 ppm/ °C –40 to +85 Q-16 AD688BQ 2 mV 3 ppm/ °C –40 to +85* Q-16 AD688SQ 5 mV 6 ppm/ °C –55 to +125 Q-16 NOTES 1For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current AD688/883B data sheet. 2Q = Cerdip. *Temperature coefficient specified from 0 to +70 °C. PIN CONFIGURATION THEORY OF OPERATION The AD688 consists of a buried Zener diode reference, amplifi- ers and associated thin-film resistors as shown in the block diagram of Figure 1. The temperature compensation circuitry provides the device with a temperature coefficient of 1.5 ppm/ °C or less. Amplifier A1 performs several functions. A1 primarily acts to amplify the Zener voltage to the required 20 volts. In addition, A1 also provides for external adjustment of the 20 V output through Pin 5, the GAIN ADJUST. Using the bias compensa- tion resistor between the Zener output and the noninverting input to A1, a capacitor can be added at the NOISE REDUCTION pin (Pin 7) to form a low pass filter and reduce the noise contribution of the Zener to the circuit. Two matched 12 k Ω nominal thin-film resistors (R4 and R5) divide the 20 V output in half. Ground sensing for the circuit is provided by Amplifier A2. The noninverting input (Pin 9) senses the system ground and forces the midpoint of resistors R4 and R5 to be a virtual ground. Pin 12 (BALANCE ADJUST) can be used for fine adjustment of this midpoint transfer. Amplifiers A3 and A4 are internally compensated and are used to buffer the voltages at Pins 6 and 8 as well as to provide a full Kelvin output. Thus, the AD688 has a full Kelvin capability by providing the means to sense a system ground and provide forced and sensed outputs referenced to that ground. Figure 1. AD688 Functional Block Diagram |
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