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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
TYPICAL APPLICATION
8-PIN TO-3 PACKAGE STYLE CE
DESCRIPTION
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".

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 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

APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA08 * PA08A
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal at TC = 25C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction1 TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case PA08 TYP .5 15 .5 75 5 .01 2.5 105 4 130 118 111 5 90 60
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
300V 200mA 17.5W 50V VS 300C 175C -65 to +150C -55 to +125C PA08A TYP .25 5 * * 3 * 1.5 * * * * * * * * * * * * * * * * * * * * *
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial3 BIAS CURRENT, vs. supply OFFSET CURRENT, initial3 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE4 COMMON MODE REJECTION, DC GAIN OPEN LOOP GAIN at 10Hz OPEN LOOP GAIN at 10Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, peak SLEW RATE CAPACITIVE LOAD, AV = 1 CAPACITIVE LOAD, AV > 4 SETTLING TIME to .1% POWER SUPPLY VOLTAGE CURRENT, quiescent THERMAL RESISTANCE, AC junction to case5 RESISTANCE, DC junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case TEST CONDITIONS 2 TC = 25C TC = -25C to +85C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C TC = -25C to +85C TC = -25C to +85C, VCM = 90V TC = 25C, RL = TC = 25C, RL = 1.2K TC = 25C, RL = 1.2K TC = 25C, RL = 1.2K TC = -25 to +85C TC = 25C, IO = 150mA TC = -25o C to +85oC, IO = 75mA TC = -25o C to +85oC, IO = 20mA TC = 85C TC = 25C TC = -25 to +85C TC = -25 to +85C TC = 25C, RL= 1.2K, 2V step TC = -55 to +125C TC = 25C TC = -55 to +125C, F > 60Hz TC = -55 to +125C, F < 60Hz TC = -55 to +125C Meets full range specification MIN
MAX 2 30 50 50
MIN
MAX .5 10 2 10 10
UNITS mV V/C V/V V/kh pA pA/V pA M pF V dB dB dB MHz kHz V V V mA V/s nF s V mA C/W C/W C/W C
VS-10
*
96
*
VS-15 VS-8 VS-10 VS-5 VS-5 VS-3 150 30 1 15 100 6 4.26 6.22 30
10 SOA
* * * * 20
150 8.5
* *
8.57 85 *
* *
-25
NOTES: * The specification of PA08A is identical to the specification 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 specified 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.
CAUTION
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 850C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
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TYPICAL PERFORMANCE GRAPHS
PA08 * PA08A

APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA08 * PA08A
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit and heat sink selection. The "Application Notes" and "Technical Seminar" sections contain a wealth of information on specific 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.
OPERATING CONSIDERATIONS
VS
150V 125V 100V 75V 50V
SHORT TO VSC, C, L, OR EMF LOAD
20mA 27mA 42mA 67mA 130mA
SHORT TO COMMON
67mA 90mA 130mA 200mA 200mA
These simplified limits may be exceeded with further analysis using the operating conditions for a specific application.
3. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used.
SAFE OPERATING AREA (SOA)
INDUCTIVE LOADS
Two external diodes as shown in Figure 1, are required to protect these amplifiers from flyback (kickback) pulses exceeding the supply voltages of the amplifier 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 flyback energy into the supply rails thus protecting the output transistors from destruction due to reverse bias.

The output stage of most power amplifiers 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 specified 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:

PROTECTION, INDUCTIVE LOAD PROTECTION, OVERVOLTAGE A note of caution about the supply. The energy of the flyback pulse must be absorbed by the power supply. As a result, a transient 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.
VS
150V 125V 100V 75V 50V
C(MAX)
.4F .9F 2F 10F 100F
L(MAX)
280mH 380mH 500mH 1200mH 13H
CURRENT LIMITING
Proper operation requires the use of two current limit resistors, connected as shown in the external connection diagram. The minimum value for RCL is 3.24. 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.
2. The amplifier 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:
This data sheet has been carefully checked and is believed to be reliable, SHANNON ROAD * is assumed ARIZONA 85741 * USA * APPLICATIONS are subject 1 (800) 546-2739 APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH however, no responsibility TUCSON, for possible inaccuracies or omissions. All specificationsHOTLINE: to change without notice.
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PA08U REV K NOVEMBER 2004
(c) 2004 Apex Microtechnology Corp.

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