APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

FEATURES

• MONOLITHIC MOS TECHNOLOGY

• LOW COST

• HIGH VOLTAGE OPERATION—350V

• LOW QUIESCENT CURRENT—2mA

• NO SECOND BREAKDOWN

• HIGH OUTPUT CURRENT—120 mA PEAK

• AVAILABLE IN DIE FORM—PA41DIE

APPLICATIONS

• PIEZO ELECTRIC POSITIONING

• ELECTROSTATIC TRANSDUCER & DEFLECTION

• DEFORMABLE MIRROR FOCUSING

• BIOCHEMISTRY STIMULATORS

• COMPUTER TO VACUUM TUBE INTERFACE

DESCRIPTION

The PA41/42 are high voltage monolithic MOSFET opera-

tional amplifiers achieving performance features previously

found only in hybrid designs while increasing reliability. Inputs

are protected from excessive common mode and differential

mode voltages. The safe operating area (SOA) has no second

breakdown limitations and can be observed with all type loads

by choosing an appropriate current limiting resistor. External

compensation provides the user flexibility in choosing

optimum gain and bandwidth for the application.

The PA41 is packaged in a hermetically sealed TO-3 and all

circuitry is isolated from the case by an aluminum nitride (AlN)

substrate.

The PA42 is packaged in APEX’s hermetic ceramic SIP10

package.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATION

NOTE: PA41 Recommended mounting torque is 4-7 in•lbs

(.45 -.79 N•m)

CAUTION: The use of compressible, thermally conductive

insulators may void warranty.

LOW COST 660V p-p

PIEZO DRIVE

Two PA41/42 amplifiers operated as a bridge driver for a

piezo transducer provides a low cost 660 volt total drive capa-

bility. The R

at high frequencies. If R

compensated identically and will have matching bandwidths.

EXTERNAL CONNECTIONS

TOP VIEW

1

2

3

4

5

6

7

8

OUT

COMP

–IN

+IN

C , C

ARE NPO RATED

FOR FULL SUPPLY VOLTAGE.

=

3

COMP

100

Ω

330pF

R

CL

S

C

PHASE

COMPENSATION

Gain

C

C

R

C

1

18pF

2.2K

Ω

≥10

10pF

2.2K

Ω

≥30

3.3pF

2.2K

Ω

PA41

PA42

100

Ω

1

2

3

4

56

78

9

10

–IN

+IN

NC

–V

S

OUT

NC

330pf

+V

S

TOP VIEW

A1

PA41/42

A2

PA41/42

20R

PIEZO

TRANSDUCER

20R

Rn

20R

Cn

R

–175

+175

–175

+175

180

180

2.2K

10pF

10pF

330pF

330pF

100

Ω

100

Ω

2.2K

4

7

–IN

OUT

+V

S

–V

S

1

8

6

+IN

5

D2

D3

D4

D5

Q5

Q4

Q1

Q11

Q12

D1

Q2

Q6

Q8

Q13

Q14

Q10

Q9

Q7

Q3

I

LIM

2

COMP

3

COMP

(5)

(10)

(7)

(6)

(8)

(9)

(2)

(1)

5

(1)

PA41 PIN NUMBER

PA42 PIN NUMBER

HTTP://WWW.APEXMICROTECH.COM

(800) 546-APEX

(800) 546-2739

MICROTECHNOLOGY

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

PA41/PA42 • PA41A/PA42A