鈥?/div>
PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
R
CL
Rn
Cn
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鈥檚 hermetic ceramic SIP10
package.
PIEZO
180 TRANSDUCER 180
100
鈩?/div>
100
鈩?/div>
330pF
330pF
鈥?75
LOW COST 660V p-p
PIEZO DRIVE
鈥?75
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
C
N
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
R
CL
R
C
COMP
3
C
C
2
COMP
1
PHASE
COMPENSATION
I
LIM
EQUIVALENT SCHEMATIC
D1
Q1
Q2
Q3
Q4
(1) 5
鈥揑N
D2
(2) 6
+IN
Q11
Q12
Q13
D3
D4
D5
Q5
(8) 2 Q6
COMP
COMP Q8
(9) 3
Q7
4 (10)
OUT
I
LIM
1 (7)
8 (6)
+V
S
OUT
4
Gain
1
鈮?0
鈮?0
C
S
330pF
C
C
18pF
10pF
3.3pF
R
C
2.2K鈩?/div>
2.2K鈩?/div>
2.2K鈩?/div>
TOP VIEW
5
鈥揑N
6
8
PA41
PA42
+IN
鈥揤
S
7
+V
S
R
S
100
鈩?/div>
C
S
, C
C
ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
R
CL
=
3
I
LIM
TOP VIEW
1
2
3
NC
4
5
6
+V
S
I
LIM
R
S
100鈩?/div>
C
S
330pf
7
8
C
C
R
C
9
C
C
10
OUT
Q9
NC 鈥揤
S
Q10
鈥揑N
Q14
鈥揤
S
7
(5)
+IN
C
C
R
CL
5
PA41 PIN NUMBER
NOTE:
PA41 Recommended mounting torque is 4-7 in鈥bs
(.45 -.79 N鈥)
CAUTION:
The use of compressible, thermally conductive
insulators may void warranty.
(1) PA42 PIN NUMBER
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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