PA81J

PA81J • PA82J PA81J • PA82J PA81J, PA82J High Voltage Power Operational Amplifiers FEATURES • HIGH VOLTAGE OPERATION — ±150V (PA82J) • HIGH OUTPUT CURRENT — ±30mA (PA81J) • LOW BIAS CURRENT, LOW NOISE — FET Input APPLICATIONS • HIGH IMPEDANCE BUFFERS UP TO ±140V • ELECTROSTATIC TRANSDUCER & DEFLECTION • PROGRAMMABLE POWER SUPPLIES TO ±145V • BIOCHEMISTRY STIMULATORS • COMPUTER TO VACUUM TUBE INTERFACE 8-PIN TO-3 PACKAGE STYLE CE 70K +75V DESCRIPTION The PA80 series of high voltage operation amplifiers provides an extremely wide range of supply capability with two overlapping products. High accuracy is achieved with a cascode input circuit configuration. All internal biasing is referenced to a zener diode. As a result, these models offer outstanding common mode and power supply rejection. The output stage operates in the class A/B mode for best linearity. Internal phase compensation assures stability at all gain settings without external components. Fixed internal current limits protect these amplifiers against a short circuit to common at most supply voltages. For sustained high energy flyback, external fast recovery diodes should be used. However, a heatsink may be necessary to maintain the proper case temperature under normal operating conditions. This hybrid circuit utilizes thick film resistors, ceramic capacitors and silicon semiconductors 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 (see Package Outlines) is hermetically sealed and isolated from the internal circuits. The use of compressible thermal washers voids the warranty. 8 .47 –75V HIGH VOLTAGE PROGRAMMABLE POWER SUPPLY TYPICAL APPLICATION The PA81 and 70K ohm resistor form a current to voltage converter, accepting ±1mA from a 12 bit current output digital to analog converter. The power op amp contribution to the error budget is insignificant. At a case temperature of 70°C, the combination of voltage offset and bias errors amounts to less than 31ppm of full scale range. Incorporation of the optional offset trim can further reduce these errors to under 9ppm. EQUIVALENT SCHEMATIC 4 D1 3 +IN Q4 5 –IN Q5 +VS 2 C3 C2 4 OUT Q3 Q2 Q1 6 TOP VIEW 1 ±70V PA81J C1 -VS 7 D/A 2 EXTERNAL CONNECTIONS N.C. .47 ±1mA Q8 BAL 3 BAL NOTE: Input offset trimpot optional. Recommended value of 100KΩ C5 Q6 Q9 C4 Q7 Q11 Q12B 1 Q12A 5 Q13 Q14 6 Q16 Q17 Q15 C6 D2 7 www.apexanalog.com PA81-82U Copyright © Apex Microtechnology, Inc. 2014 (All Rights Reserved) OCT 2015 1 PA81-82JU REVP PA81J • PA82J ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10 sec TEMPERATURE, junction TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case SPECIFICATIONS PARAMETER TEST CONDITIONS 2 INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial BIAS CURRENT, vs. supply OFFSET CURRENT, initial INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE2 COMMON MODE REJECTION, DC TC = 25°C Full temperature range TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C Full temperature range VCM = ±20V GAIN OPEN LOOP GAIN at 10Hz UNITY GAIN BANDWIDTH POWER BANDWIDTH PHASE MARGIN Full load TC = 25°C TC = 25°C, full load Full temperature range OUTPUT VOLTAGE SWING2 CURRENT, peak CURRENT, limit SETTLING TIME to .1% SLEW RATE4 CAPACITIVE LOAD TC = 25°C, IPK TC = 25°C TC = 25°C TC = 25°C, 10V step TC = 25°C AV = 1 POWER SUPPLY VOLTAGE CURRENT, quiescent Full temperature range TC = 25°C THERMAL RESISTANCE, AC, junction to case3 RESISTANCE, DC, junction to case3 RESISTANCE, junction to air TEMPERATURE RANGE, shutdown TEMPERATURE RANGE, case NOTES: ±VS–10 94 ±VS–5 30 ±32 F > 60Hz F < 60Hz Full temperature range Meets full range specification 0 PA81J TYP PA82J MAX MIN TYP MAX UNITS ±1.5 10 20 75 5 .2 2.5 1011 10 ±3 * * mV 25 * * µV/°C * µV/V * µV/√kh 50 * * pA * pA/V 50 * * pA * Ω * pF * V * dB 110 116 5 60 45 100 118 * 30 * 50 12 20 10 * V 15 mA 25 mA * µs * V/µs * nF ±75 6.5 ±75 ±70 8.5 ±150 6.5 6 9 30 150 * 10 * * * * 70 * * dB MHz kHz ° ±150 8.5 V mA °C/W °C/W °C/W °C °C * The specification of PA82J is identical to the specification for PA81J in applicable column to the left. 1. The power supply voltage for all specifications is the TYP rating unless noted as a test condition. 2. +VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS. 3. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 4. On the PA81J and PA82J, signal slew rates at pins 5 and 6 must be limited to less than 1V/ns to avoid damage. When faster waveforms are unavoidable, resistors in series with those pins, limiting current to 150mA will protect the amplifier from damage.   CAUTION 2 MIN PA81J PA82J 200V 300V Internally Limited 11.5W 11.5W ±150V ±300V ±VS ±VS 350°C 350°C 150°C 150°C –65 to +125°C –65 to +125°C –55 to +125°C –55 to +125°C 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. PA81-82U POWER DERATING 8 6 T = TA 2 125 SMALL SIGNAL RESPONSE 120 70 60 –50 –30 80 –60 60 40 20 0 1 100 1K 10K 100K 1M FREQUENCY, F (Hz) 10 –150 10 1 NORMALIZED SLEW RATE .03 PA82J RL = 10KΩ 100VRMS .01 100 300 120 100 PA 80 81 J/P A8 60 2J 40 20 0 1 PA81-82U 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M 5 +2 0.8 0.7 40 1K 3K 10K 30K 100K FREQUENCY, F (Hz) COMMON MODE REJECTION C ° 85 °C TO + °C 5 –2 50 60 70 80 90 100 POWER SUPPLY (% OF MAX) 110 POWER SUPPLY REJECTION 140 120 100 80 +VS 60 –VS 40 20 0 1 10 16 4 1 .25 .06 –15 5 25 65 45 85 105 CASE TEMPERATURE, TC (°C) POWER RESPONSE PA82J 200 PA81J 100 60 30 50K .1M .15M .25M.35M.5M FREQUENCY, F (Hz) INPUT NOISE 20 1.0 0.9 64 15 25K 1M 10M SLEW RATE PA81J RL = 2KΩ 40VRMS .1 100 1K 10K .1M FREQUENCY, F (Hz) BIAS CURRENT 256 300 –120 HARM0NIC DISTORTION .3 140 PHASE RESPONSE –90 –210 10M 1 .003 –25 0 25 50 75 100 125 CASE TEMPERATURE, TC (°C) –180 3 DISTORTION (%) 80 100 –20 COMMOM MODE REJECTION, CMR (dB) 90 0 PHASE, Ф (°) OPEN LOOP GAIN, A (dB) 25 50 75 100 TEMPERATURE, TC (°C) 100 OUTPUT VOLTAGE, VO (VPP) 0 110 INPUT NOISE VOLTAGE, VN (nV/√Hz) 0 120 100 1K 10K .1M FREQUENCY, F (Hz) 1M 10 6 4 2 10 300 COMMON MODE VOLTAGE, VCM (VPP) 4 NORMALIZED BIAS CURRENT, IB (X) T = TC 10 CURRENT LIMIT 130 NORMALIZED CURRENT LIMIT, (%) 12 POWER SUPPLY REJECTION, PSR (dB) INTERNAL POWER DISSIPATION, P (W) PA81J • PA82J 200 100 100 1K 10K FREQUENCY, F (Hz) .1M COMMON MODE VOLTAGE PA82J PA81J 60 30 15 10K 20K 50K .1M .2M .5M 1M FREQUENCY, F (Hz) 3 PA81J • PA82J 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.apexanalog.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 Microtechnology product models, consult the "Evaluation Kit" section for details. For the most current version of all Apex Microtechnology product data sheets, visit www.apexanalog.com. SAFE OPERATING AREA (SOA) For the PA80J and PA81J, the combination of voltage capability and internal current limits mandate that the devices are safe for all combinations of supply voltage and load. On the PA82J, any load combination is safe up to a total supply of 250 volts. When total supply voltage equals 300 volts, the device will be safe if the output current is limited to 10 milliamps or less. This means that the PA82J used on supplies up to 125 volts will sustain a short to common or either supply without danger. When using supplies above ±125 volts, a short to one of the supplies will be potentially destructive. When using single supply above 250 volts, a short to common will be potentially destructive. Safe supply voltages do not imply disregard for heatsinking. The thermal calculations and the use of a heatsink are required in many applications to maintain the case temperature within the specified operating range of 0 to 70°C. Exceeding this case temperature range can result in an inoperative circuit due to excessive input errors or activation of the thermal shutdown. INDUCTIVE LOADS Two external diodes as shown in Figure 2, are required to protect these amplifiers against flyback (kickback) pulses exceeding the supply voltage 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. Be sure the diode voltage rating is greater than the total of both supplies. 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. 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. 4 +VS FIGURE 2. PROTECTION, INDUCTIVE LOAD –VS SINGLE SUPPLY OPERATION These amplifiers are suitable for operation from a single supply voltage. The operating requirements do however, impose the limitation that the input voltages do not approach closer than 10 volts to either supply rail. This is due to the operating voltage requirements of the current sources, the half-dynamic loads and the cascode stage. Refer to the simplified schematics.Thus, single supply operation requires the input signals to be biased at least 10 volts from either supply rail. Figure 3 illustrates one bias technique to achieve this. Figure 4 illustrates a very common deviation from true single 50K 2.5K 50K +210V 2.5/10V D/A +210V 50K 2.5K +210V PA82J +50/+200V 50K FIGURE 3. TRUE SINGLE SUPPLY OPERATION supply operation. The availibility of two supplies still allows ground (common) referenced signals, but also maximizes the high voltage capability of the unipolar output. This technique can utilize an existing low voltage system power supply and does not place large current demands on that supply. The 12 volt supply in this case must supply only the quiescent current of the PA81J, which is 8.5mA maximum. If the load is reactive or EMF producing, the low voltage supply must also be able to absorb the reverse currents generated by the load. 50K +12V 0/5V D/A FIGURE 4. NON-SYMMETRIC SUPPLIES 2K PA81J 0/–125V –130V PA81-82U PA81J • PA82J NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks of their respective holders. www.apexanalog.com PA81-82U Copyright © Apex Microtechnology, Inc. 2014 (All Rights Reserved) OCT 20155 PA81-82JU REVP