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

1

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—CPA141

APPLICATIONS

• PIEZO ELECTRIC POSITIONING

• ELECTROSTATIC TRANSDUCER & DEFLECTION

• DEFORMABLE MIRROR FOCUSING

• BIOCHEMISTRY STIMULATORS

• COMPUTER TO VACUUM TUBE INTERFACE

DESCRIPTION

The PA141/PA142 are high voltage monolithic MOSFET

operational 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 com-

pensation provides the user flexibility in choosing

optimum gain and bandwidth for the application.

The PA141 is packaged in a hermetically sealed TO-3

and all circuitry is isolated from the case by an aluminum

nitride (AlN) substrate.

The PA142 is packaged in APEX’s hermetic ceramic

SIP package.

HTTP://WWW.APEXMICROTECH.COM

(800) 546-APEX

(800) 546-2739

MICROTECHNOLOGY

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

PA141/PA142 • PA141A/PA142A

TYPICAL APPLICATION

A1

PA141/142

A2

PA141/142

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

Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"

LOW COST 660V p-p

PIEZO DRIVE

Two PA141/PA142 amplifiers operated as a bridge driver

for a piezo transducer provides a low cost 660 volt total drive

capability. The R

gain of A2 at high frequencies. If R

amplifiers can be compensated identically and will have

matching bandwidths.

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)

PA141 PIN NUMBER

PA142 PIN NUMBER

EQUIVALENT SCHEMATIC

EXTERNAL CONNECTIONS

100

Ω

12

3

4

5

6

78

9

10

–IN

+IN

NC

–V

S

OUT

NC

330pf

+V

S

TOP VIEW

PA142

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

NOTE: PA141 Recommended mounting torque is 4-7 in•lbs

(.45 -.79 N•m)

CAUTION: The use of compressible, thermally conductive

insulators may void warranty.

PHASE

COMPENSATION

Gain

C

C

R

C

1

18pF

2.2K

10

10pF

2.2K

30

3.3pF

2.2K

PA141

8-PIN TO-3

PACKAGE STYLE CE

10-PIN SIP

PACKAGE STYLE DW