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PA89 • PA89A
PA89 • PA89A
High Voltage Power Operational Amplifiers
FEATURES
• 1140V P-P SIGNAL OUTPUT
• WIDE SUPPLY RANGE — ±75V to ±600V
• PROGRAmmAbLE CURRENT LImIT
• 75 mA
CONTINUOUS OUTPUT CURRENT
• HERmETIC SEALED PACKAGE
• INPUT PROTECTION
PATENTED
APPLICATIONS
• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUmENTATION
• ELECTROSTATIC DEFLECTION
• SEmICONDUCTOR TESTING
TYPICAL APPLICATION
HIGH VOLTAGE mO-127
PACKAGE STYLE DC
DESCRIPTION
The PA89 is an ultra high voltage, MOSFET operational ampli-
fier designed for output currents up to 75 mA. Output voltages
can swing over 1000V p-p. The safe operating area (SOA) has
no second breakdown limitations and can be observed with
all types of loads by choosing an appropriate current limiting
resistor. High accuracy is achieved with a cascode input circuit
configuration and 120dB open loop gain. All internal biasing is
referenced to a bootstrapped zener-MOSFET current source,
giving the PA89 a wide supply range and excellent supply
rejection. The MOSFET output stage is biased for class A/B
linear operation. External compensation provides user flexibility.
The PA89 is 100% gross leak tested to military standards for
long term reliability.
This hybrid integrated circuit utilizes a beryllia (BeO) sub-
strate, thick film resistors, ceramic capacitors and semiconduc-
tor chips to maximize reliability, minimize size and give top
performance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures. The
MO-127 High Voltage, Power Dip™ package is hermetically
sealed and electrically isolated. The use of compressible
thermal washers will void the product warranty.
Ultra-high voltage capability combined with the bridge am-
plifier configuration makes it possible to develop +/–1000 volt
peak swings across a piezo element. A high gain of –50 for
A1 insures stability with the capacitive load, while “noise-gain”
compensation Rn and Cn on A2 insure the stability of A2 by
operating in a noise gain of 50.
50R
50R
50R
+600V
R
V
IN
A1
PA89
PIEZO
TRANSDUCER
–600V
–600V
A2
PA89
+600V
R
Cn
SINGLE AXIS MICRO-POSITIONING
EXTERNAL CONNECTIONS
–IN
+IN
N/C
1
2
3
4
5
6
TOP
VIEW
12
11
10
9
8
7
RESERVED
RESERVED
C
C
COMP
R
C
COMP
SImPLIFIED SCHEmATIC
D1
Q3
Q1
Q2
D57
COMP
9
10
–IN
1
Q22
Q25A
Q23
Q25B
+IN
2
Q29
Q36
D30
D35
Q45
D5
D34
D31
Q44
–VS
5
Q42
6
OUT
Q19
Q20
Q26
CL
7
8
+VS
N/C
–V
S
OUT
+V
S
C
L
R
CL
=
R
CL
.7
I
LIM
PHASE COMPENSATION
Gain
1
10
15
100
C
C
470pF
68pF
33pF
15pF
R
C
470Ω
220Ω
220Ω
220Ω
Note: C
C
must be rated for full supply voltage –Vs to +Vs.
See details under “EXTERNAL COMPONENTS”
.
PA89U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009
1
APEX − PA89UREVJ
CIRRUS [ CIRRUS LOGIC ]
