Prod
uct Innovati
PA98, PA98A
o n
From
PA98 • PA98A
PA98 • PA98A
DESCRIPTION
The PA98 is a high voltage, high power bandwidth
MOSFET operational amplifier designed for output
currents up to 200mA. Output voltages can swing up
to ±215V with a dual supply and up to +440 volts with
a single supply. The safe operating area (SOA) has
no second breakdown limitations and can be observed
with all types of loads by choosing an appropriate cur-
rent limiting resistor. High accuracy is achieved with a
cascode input circuit configuration. All internal biasing
is referenced to a bootstrapped zener-MOSFET cur-
rent source. As a result, the PA98 features an unprec-
edented supply range and excellent supply rejection.
The MOSFET output stage is biased on for linear oper-
ation. External compensation provides user flexibility.
This hybrid circuit utilizes thick film (cermet) resistors,
ceramic capacitors and silicon semiconductor chips to
maximize reliability, minimize size and give top perfor-
mance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures.
The Power SIP package is electrically isolated.
Power Operational Amplifiers
FEATURES
♦
HIGH VOLTAGE — 450V (±225V)
♦
HIGH SLEW RATE — 1000V/μS
♦
HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
♦ HIGH VOLTAGE INSTRUMENTATION
♦ PIEZO TRANSDUCER EXCITATION
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 430V
♦ ELECTROSTATIC TRANSDUCERS &
DEFLECTION
EQUIVALENT SCHEMATIC
D1
Q1
Q2
Q3
Q9
11
+V
S
12
+V
S
D23
COMP
4
5
Q8
Q12
9
C
L
10
C
L
6
OUT
–IN
1
Q6
Q10A
Q7
Q10B
+IN
2
Q11
Q17
Q13
D2
Q18
Q15
8
–V
S
7
–V
S
PA98U
www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
NOV 2009
1
APEX − PA98REVK
CIRRUS [ CIRRUS LOGIC ]
