
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 inlbs
(.45 -.79 Nm)
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
N CN network serves to raise the apparent gain of A2
at high frequencies. If R
N is set equal to R the amplifiers can be
compensated identically and will have matching bandwidths.
EXTERNAL CONNECTIONS
TOP VIEW
1
2
3
4
5
6
7
8
OUT
ILIM
–VS
+VS
COMP
–IN
+IN
C , C
ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
=
3
COMP
CC
100
330pF
R C
R CL
R
CL
I LIM
S
C S
C
R S
PHASE
COMPENSATION
Gain
C
R
C
1
18pF
2.2K
≥10
10pF
2.2K
≥30
3.3pF
2.2K
PA41
PA42
RCL
CC
100
1
2
3
4
56
78
9
10
–IN
+IN
NC
–V
S
CC
ILIM
CS
CC
RC
OUT
NC
330pf
+V
S
TOP VIEW
RS
A1
PA41/42
A2
PA41/42
20R
PIEZO
TRANSDUCER
20R
Rn
20R
Cn
R
V IN
–175
+175
–175
+175
RCL
180
2.2K
10pF
330pF
100
100
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
Powered by ICminer.com Electronic-Library Service CopyRight 2003