AD588KQ Просмотр технического описания (PDF) - Analog Devices

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AD588KQ

High Precision Voltage Reference

Analog Devices 

Figure 22. Bipolar Bridge Drive

AD588

As shown in Figure 22, the AD588 is an excellent choice for the

control element in a bipolar bridge driver scheme. Transistors

Q1 and Q2 serve as series pass elements to boost the current

drive capability to the 28 mA required by a typical 350 Ω

bridge. A differential gain stage may still be required if the

bridge balance is not perfect. Such gain stages can be expensive.

Additional common-mode voltage reduction is realized by using

the circuit illustrated in Figure 23. A1, the ground sense ampli-

fier, servo’s the supplies on the bridge to maintain a virtual

ground at one center tap. The voltage which appears on the op-

posite center tap is now single-ended (referred to ground) and

can be amplified by a less expensive circuit.

Figure 23. Floating Bipolar Bridge Drive with Minimum CMV

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

Cerdip (Q) Package

REV. B

–12–

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