Sell LVDT Signal Conditioner

Product Description

1. The AD**8 offers a monolithic solution to LVDT and

RVDT signal conditioning problems; few extra passive com-

ponents are required to complete the conversion from me-

chanical position to dc voltage and no adjustments are

required.

2. The AD**8 can be used with many different types of

LVDTs because the circuit accommodates a wide range of

and output voltages and frequencies; the AD**8 can

drive an LVDT primary with up to *4 V rms and accept sec-

ondary levels as low as **0 mV rms.

3. The *0 Hz to *0 kHz LVDT excitation frequency is deter-

mined by a single external capacitor. The AD**8 sig-

nal need not be synchronous with the LVDT primary drive.

This means that an external primary excitation, such as the

**0 Hz power mains in aircraft, can be used.

4. The AD**8 uses a ratiometric decoding scheme such that

primary to secondary phase shifts and transducer null voltage

have absolutely no effect on overall circuit performance.

5. Multiple LVDTs can be driven by a single AD**8, either in

series or parallel as long as power dissipation limits are not

exceeded. The excitation output is thermally protected.

6. The AD**8 may be used in telemetry applications or in hos-

tile environments where the interface electronics may be re-

mote from the LVDT. The AD**8 can drive an LVDT at

the end of **0 feet of cable, since the circuit is not affected

by phase shifts or absolute signal magnitudes. The position

output can drive as much as ***0 feet of cable.

7. The AD**8 may be used as a loop integrator in the design of

simple electromechanical servo loops.