APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
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
DESCRIPTION
The PA08 is a high voltage operational amplier designed
for output voltage swings of up to ±145V with a dual (±) sup-
ply or 290V with a single supply. High accuracy is achieved
with a cascode input circuit conguration. All internal biasing
is referenced to a zener diode fed by a FET constant current
source. As a result, the PA08 features an unprecedented sup-
ply 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 yback pulse protection diodes
are recommended. A heatsink may be necessary to maintain
the proper case temperature under normal operating condi-
tions.
This hybrid integrated circuit utilizes beryllia (BeO) substrate,
thick lm resistors, ceramic capacitors and semiconductor chips
to maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections 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”.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATION
ATE PIN DRIVER
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 volt-
age differential equal to the amplier supply plus the largest
magnitude voltage applied to any other pin of the DUT. In
addition, yback diodes are recommended when the output of
the amplier exits any equipment enclosure to prevent damage
due to electrostatic discharges. Refer to Application Note 7
for details on accuracy considerations of this circuit.
EXTERNAL CONNECTIONS
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8-PIN TO-3
PACKAGE STYLE CE
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 300V
OUTPUT CURRENT, within SOA 200mA
POWER DISSIPATION, internal at TC = 25°C 17.5W
INPUT VOLTAGE, differential ±50V
INPUT VOLTAGE, common mode ±VS
TEMPERATURE, pin solder - 10s max 300°C
TEMPERATURE, junction1 175°C
TEMPERATURE RANGE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C
PA08 PA08A
PARAMETER TEST CONDITIONS 2 MIN TYP MAX MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial TC = 25°C ±.5 ±2 ±.25 ±.5 mV
OFFSET VOLTAGE, vs. temperature TC = –25°C to +85°C ±15 ±30 ±5 ±10 µV/°C
OFFSET VOLTAGE, vs. supply TC = 25°C ±.5 * 2 µV/V
OFFSET VOLTAGE, vs. time TC = 25°C ±75 * µV/√kh
BIAS CURRENT, initial3 TC = 25°C 5 50 3 10 pA
BIAS CURRENT, vs. supply TC = 25°C .01 * pA/V
OFFSET CURRENT, initial3 TC = 25°C ±2.5 ±50 ±1.5 ±10 pA
INPUT IMPEDANCE, DC TC = 25°C 105 * MΩ
INPUT CAPACITANCE TC = 25°C 4 * pF
COMMON MODE VOLTAGE RANGE4 TC = –25°C to +85°C ±VS–10 * V
COMMON MODE REJECTION, DC TC = –25°C to +85°C, VCM = ±90V 130 * dB
GAIN
OPEN LOOP GAIN at 10Hz TC = 25°C, RL = ∞ 118 * dB
OPEN LOOP GAIN at 10Hz TC = 25°C, RL = 1.2KΩ 96 111 * * dB
GAIN BANDWIDTH PRODUCT at 1MHz TC = 25°C, RL = 1.2KΩ 5 * MHz
POWER BANDWIDTH TC = 25°C, RL = 1.2KΩ 90 * kHz
PHASE MARGIN TC = –25 to +85°C 60 * °
OUTPUT
VOLTAGE SWING4 TC = 25°C, IO = 150mA ±VS–15 ±VS–8 * * V
VOLTAGE SWING4 TC = –25o C to +85oC, IO = ±75mA ±VS–10 ±VS–5 * * V
VOLTAGE SWING4 TC = –25o C to +85oC, IO = ±20mA ±VS–5 ±VS–3 * * V
CURRENT, peak TC = 85°C 150 * mA
SLEW RATE TC = 25°C 30 20 * V/µs
CAPACITIVE LOAD, AV = 1 TC = –25 to +85°C 10 * nF
CAPACITIVE LOAD, AV > 4 TC = –25 to +85°C SOA *
SETTLING TIME to .1% TC = 25°C, RL= 1.2KΩ, 2V step 1 * µs
POWER SUPPLY
VOLTAGE TC = –55 to +125°C ±15 ±100 ±150 * * * V
CURRENT, quiescent TC = 25°C 6 8.5 * * mA
THERMAL
RESISTANCE, AC junction to case5 TC = –55 to +125°C, F > 60Hz 4.26 * °C/W
RESISTANCE, DC junction to case TC = –55 to +125°C, F < 60Hz 6.22 8.57 * * °C/W
RESISTANCE, junction to air TC = –55 to +125°C 30 * °C/W
TEMPERATURE RANGE, case Meets full range specication –25 85 * * °C
PA08 • PA08A
NOTES: * The specication of PA08A is identical to the specication for PA08 in applicable column to the left.
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve
high MTTF.
2. The power supply voltage specied under typical (TYP) applies unless otherwise noted.
3. Doubles for every 10oC of temperature increase.
4. +VS and –VS denote the positive and negative supply rail respectively.
5. Rating applies only if output current alternates between both output transistors at a rate faster than 60Hz.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
TYPICAL PERFORMANCE
GRAPHS PA08 • PA08A
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APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
PA08 • PA08A
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specication
interpretation. Visit www.apexmicrotech.com for design tools
that help automate tasks such as calculations for stability, in-
ternal power dissipation, current limit and heat sink selection.
The "Application Notes" and "Technical Seminar" sections
contain a wealth of information on specic types of applications.
Package outlines, heat sinks, mounting hardware and other
accessories are located in the "Packages and Accessories"
section. Evaluation Kits are available for most Apex product
models, consult the "Evaluation Kit" section for details. For
the most current version of all Apex product data sheets, visit
www.apexmicrotech.com.
SAFE OPERATING AREA (SOA)
The output stage of most power ampliers has two distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specied limits.
The SOA curves combine the effect of these limits. For a
given application, the direction and magnitude of the output
current should be calculated or measured and checked against
the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts.
1. Under transient conditions, the following capacitive and
inductive loads are safe with the current limits set to the
maximum:
±VS C(MAX) L(MAX)
150V .4µF 280mH
125V .9µF 380mH
100V 2µF 500mH
75V 10µF 1200mH
50V 100µF 13H
2. The amplier can handle any EMF generating or reactive
load and short circuits to the supply rails or simple shorts
to common if the current limits are set as follows:
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150V 20mA 67mA
125V 27mA 90mA
100V 42mA 130mA
75V 67mA 200mA
50V 130mA 200mA
These simplied limits may be exceeded with further analysis
using the operating conditions for a specic application.
3. The output stage is protected against transient yback.
However, for protection against sustained, high energy
yback, external fast-recovery diodes should be used.
INDUCTIVE LOADS
Two external diodes as shown in Figure 1, are required
to protect these ampliers from yback (kickback) pulses
exceeding the supply voltages of the amplier when driving
inductive loads. For component selection, these external diodes
must be very quick, such as ultra fast recovery diodes with no
more than 200 nanoseconds of reverse recovery time. The
diode will turn on to divert the yback energy into the supply
rails thus protecting the output transistors from destruction due
to reverse bias.
A note of caution about the supply. The energy of the yback
pulse must be absorbed by the power supply. As a result, a tran-
sient will be superimposed on the supply voltage, the magnitude
of the transient being a function of its transient impedance and
current sinking capability. If the supply voltage plus transient
exceeds the maximum supply rating or if the AC impedance
of the supply is unknown, it is best to clamp the output and the
supply with a zener diode to absorb the transient.
INPUT PROTECTION
The input is protected against common mode voltages up to
the supply rails and differential voltages up to ±50V. Increased
protection against differential input voltages can be obtained by
adding 2 resistors, 2 capacitors and 4 diode connected FETs
as shown in Figure 2.
CURRENT LIMITING
Proper operation requires the use of two current limit resis-
tors, connected as shown in the external connection diagram.
The minimum value for RCL is 3.24Ω. However, for optimum
reliability it should be set as high as possible. Refer to the
“General Operating Considerations” section of the handbook
for current limit adjust details.
PROTECTION,INDUCTIVELOAD PROTECTION,OVERVOLTAGE
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This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA08U REV L OCTOBER 2006 © 2006 Apex Microtechnology Corp.
