PA08 • PA08A
PA08 • PA08A
PA08, PA08A
Power Operational Amplifier
FEATURES
• WIDE SUPPLY RANGE — ±15V to ±150V
• PROGRAMMABLE OUTPUT CURRENT LIMIT
• HIGH OUTPUT CURRENT — Up to ±150mA
• LOW BIAS CURRENT — FET Input
APPLICATIONS
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PROGRAMMABLE POWER SUPPLIES UP TO 290V
• ANALOG SIMULATORS
8-PIN TO-3
PACKAGE STYLE CE
TYPICAL APPLICATION
+132V
DESCRIPTION
110KΩ
The PA08 is a high voltage operational amplifier designed
for output voltage swings of up to ±145V with a dual (±) supply or 290V with a single supply. High accuracy is achieved
with a cascode input circuit configuration. All internal biasing
is referenced to a zener diode fed by a FET constant current
source. As a result, the PA08 features an unprecedented supply range and excellent supply rejection. The output stage is
biased-on for linear operation. Internal phase compensation
assures stability at all gain settings. The safe operating area
(SOA) can be observed with all types of loads by choosing
the appropriate current limiting resistors. For operation into
inductive loads, two external flyback pulse protection diodes
are recommended. A heatsink may be necessary to maintain
the proper case temperature under normal operating conditions.
This hybrid integrated circuit utilizes beryllia (BeO) substrate,
thick film resistors, ceramic capacitors and semiconductor chips
to maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. The
use of compressible thermal isolation washers and/or improper
mounting torque will void the product warranty. Please see
“General Operating Considerations”
.
The PA08 as a pin driver is capable of supplying high test
voltages to a device under test (DUT). Due to the possibility
of short circuits to any terminal of the DUT, current limit must
be set to be safe when limiting with a supply to output voltage differential equal to the amplifier supply plus the largest
magnitude voltage applied to any other pin of the DUT. In
addition, flyback diodes are recommended when the output of
the amplifier exits any equipment enclosure to prevent damage
due to electrostatic discharges. Refer to Application Note 7
for details on accuracy considerations of this circuit.
EQUIVALENT SCHEMATIC
EXTERNAL CONNECTIONS
DAC
8.2Ω
PA08
D.U.T.
8.2Ω
-VS
-132V
-132V
ATE PIN DRIVER
CL–
7
D1
Q1
Q9
C4
OUT
1
Q11
Q12B
RCL+
Q19
8
Q12A
4
OUTPUT
Q7
5
5 –IN
Q6
C2
Q10
–VS
6
RS
TOP VIEW
C3
2
Q8
7
Q3
Q4
Q5
BAL
8
RCL-
C1
Q2
+VS
±1mA
RS= (│VS+│+│–VS│) RT/1.6
3
4
+132V
Q17
1
2
CL+
+IN
RT
3
+VS
NOTE: Input offset voltage trim optional. RT = 10KΩ MAX
Q16
Q15
D2
6
www.apexanalog.com
PA08U
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
SEP 2012
1
PA08U REVP
