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AD688SQ Scheda tecnica(PDF) 3 Page - Analog Devices

Il numero della parte AD688SQ
Spiegazioni elettronici  High Precision -10 V Reference
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD688SQ Scheda tecnica(HTML) 3 Page - Analog Devices

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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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