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TYPICAL APPLICATIONS

OPA454

0-2mA

+95V

45.3kW

-5V

V

=0Vto+91V

OUT

0.1 F

m

0.1 F

m

ProtectsDAC

DuringSlewing

DAC8811

or

DAC7811

-IN

+IN

V-

V+

R

L

+50V

UpTo

195V

Piezo

(1)

Crystal

-50V

MASTER

R

9kW

2

R

1kW

1

V

±4V

IN

OPA454

+50V

-50V

SLAVE

R

10kW

4

R

10kW

3

OPA454

-IN

+IN

-IN

+IN

V

OUT

V

OUT

V+

V+

V-

V-

A

1

A

2

OPA454

SBOS391 – DECEMBER 2007

Figure 72 and Figure 73 illustrate the OPA454 in a programmable voltage source and a bridge circuit,

respectively.

Figure 72. Programmable Voltage Source

(1) For transducers with large capacitance, stabilization may become an issue. Be certain that the Master amplifier is stable before stabilizing

the Slave amplifier.

Figure 73. Bridge Circuit Doubles Voltage for Exciting Piezo Crystals

24

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