Datenblatt-Suchmaschine für elektronische Bauteile |
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AD588 Datenblatt(PDF) 6 Page - Analog Devices |
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AD588 Datenblatt(HTML) 6 Page - Analog Devices |
6 / 20 page AD588 Rev. L | Page 6 of 20 THEORY OF OPERATION The AD588 consists of a buried Zener diode reference, amplifiers used to provide pin programmable output ranges, and associated thin-film resistors, as shown in Figure 3. 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 from 6.5 V to the required 10 V output. In addition, A1 provides for external adjustment of the 10 V output through Pin 5, GAIN ADJ. Using the bias compensation 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 10 kΩ nominal thin-film resistors (R4 and R5) divide the 10 V output in half. Pin VCT (Pin 11) provides access to the center of the voltage span and BAL ADJ (Pin 12) can be used for fine adjustment of this division. Ground sensing for the circuit is provided by Amplifier A2. The noninverting input (Pin 9) senses the system ground, which is transferred to the point on the circuit where the inverting input (Pin 10) is connected. This can be Pin 6, Pin 8, or Pin 11. The output of A2 drives Pin 8 to the appropriate voltage. Thus, if Pin 10 is connected to Pin 8, the VLOW pin is the same voltage as the system ground. Alternatively, if Pin 10 is connected to the VCT pin, it is a ground; and Pin 6 and Pin 8 are +5 V and −5 V, respectively. Amplifier A3 and Amplifier A4 are internally compensated and are used to buffer the voltages at Pin 6, Pin 8, and Pin 11, as well as to provide a full Kelvin output. Thus, the AD588 has a full Kelvin capability by providing the means to sense a system ground and provide forced and sensed outputs referenced to that ground. Note that both positive and negative supplies are required for operation of the AD588. R3 RB R1 R2 R4 R5 R6 GAIN ADJ GND SENSE +IN GND SENSE –IN VLOW BAL ADJ VCT A4 IN –VS +VS A4 OUT FORCE A4 OUT SENSE A3 OUT FORCE A3 OUT SENSE A3 IN VHIGH NOISE REDUCTION A1 A4 AD588 A2 A3 13 11 12 8 10 9 5 1 14 15 2 16 3 4 6 7 Figure 3. AD588 Functional Block Diagram |
Ähnliche Teilenummer - AD588_15 |
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Ähnliche Beschreibung - AD588_15 |
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