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HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA81J * PA82J SERIES
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
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
70K +75V 1mA
D/A
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.
.47 PA81J 70V
.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 70C, 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 2
EXTERNAL CONNECTIONS
+VS
3 2 1 4
C1 D1
3
BAL BAL -IN
Q3 Q1 Q2 Q4 Q5 C3 Q6 Q9 C4 Q12A Q13 Q14 Q16 Q15 C6 D2 Q17 Q11 Q12B
1
OUTPUT
C2 Q8
TOP VIEW
5 6 8 7
C5
5
Q7
+IN
N.C.
-VS
NOTE: Input offset trimpot optional. Recommended value of 100K .
6
7
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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 PA81J TEST CONDITIONS
2
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
PA81J PA82J 200V 300V Internally Limited 11.5W 11.5W 150V 300V VS VS 300C 300C 150C 150C -65 to +125C -65 to +125C -55 to +125C -55 to +125C PA82J MAX MIN TYP MAX UNITS
SPECIFICATIONS
PARAMETER 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 GAIN OPEN LOOP GAIN at 10Hz UNITY GAIN BANDWIDTH POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING2 CURRENT, peak CURRENT, limit SETTLING TIME to .1% SLEW RATE4 CAPACITIVE LOAD POWER SUPPLY VOLTAGE CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case3 RESISTANCE, DC, junction to case3 RESISTANCE, junction to air TEMPERATURE RANGE, shutdown TEMPERATURE RANGE, case F > 60Hz F < 60Hz Full temperature range Meets full range specification 0 Full temperature range TC = 25C 32 TC = 25C, IPK TC = 25C TC = 25C TC = 25C, 10V step TC = 25C AV = 1 VS-5 30 Full load TC = 25C TC = 25C, full load Full temperature range 94 TC = 25C Full temperature range TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C TC = 25C Full temperature range VCM = 20V MIN
TYP
VS-10
1.5 10 20 75 5 .2 2.5 1011 10 110
3 25 50 50 *
* * * * * * * * * *
* * * *
mV V/C V/V V/kh pA pA/V pA pF V dB
116 5 60 45
100
118 * 30 *
dB MHz kHz V mA mA s V/s nF 150 8.5
* 15 50 12 20 10 75 6.5 75 8.5 70 25 * * * 150 6.5
V mA C/W C/W C/W C C
6 9 30 150
10 70 *
* * * *
* *
NOTES:
* 1. 2. 3. 4.
The specification of PA82J is identical to the specification for PA81J in applicable column to the left. The power supply voltage for all specifications is the TYP rating unless noted as a test condition. +VS and -VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to -VS. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 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. 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.
CAUTION
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE GRAPHS
PA81J * PA82J
NORMALIZED CURRENT LIMIT, (%)
130 120 110 100 90 80 70 60 -50 -25 0 25 50 75 100 125 CASE TEMPERATURE, TC (C) 0 -30 -60
INTERNAL POWER DISSIPATION, P(W)
NORMALIZED BIAS CURRENT, IB (X)
12 10 8 6 4 2 0 0
POWER DERATING
T = TC
CURRENT LIMIT
BIAS CURRENT
256 64 16 4 1 .25 .06 -15 45 85 105 5 25 65 CASE TEMPERATURE, TC (C)
300
T = TA
25 50 75 100 TEMPERATURE, TC (C)
125
SMALL SIGNAL RESPONSE
120
PHASE RESPONSE
OUTPUT VOLTAGE, VO (VPP )
POWER RESPONSE
PA82J
OPEN LOOP GAIN, A (dB)
100 80 60 40 20 0 -20 1 10 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz)
200
PHASE, ()
100 60
PA81J
-90 -120 -150 -180 -210 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz)
30
15 25K
50K .1M .15M .25M.35M.5M FREQUENCY, F (Hz)
NORMALIZED SLEW RATE
1
1.0
INPUT NOISE VOLTAGE, VN (nV/ Hz)
3
HARM0NIC DISTORTION
SLEW RATE
20
INPUT NOISE
DISTORTION (%)
.3
.1 .03 .01
PA81J RL = 2K 40VRMS PA82J RL = 10K 100VRMS 100 300 1K 3K 10K 30K 100K FREQUENCY, F (Hz)
0.9
+2
0.8
C 5
TO
+
C 85
10
6 4
-2
C 5
.003
0.7 40
50 60 70 80 90 100 110 POWER SUPPLY (% OF MAX)
2 10
100 1K 10K FREQUENCY, F (Hz)
.1M
COMMOM MODE REJECTION, CMR (dB)
POWER SUPPLY REJECTION, PSR (dB)
140 120 100 80 60 40 20 0
140 120 100 80 60
COMMON MODE VOLTAGE, VCM (VPP)
COMMON MODE REJECTION
POWER SUPPLY REJECTION
300 200
COMMON MODE VOLTAGE
PA82J
PA
100 PA81J 60
81
J/P
+VS -VS
A8
2J
40 20 0 1 10 100 1K 10K .1M 1M FREQUENCY, F (Hz)
30
1
10 100 1K 10K .1M 1M FREQUENCY, F (Hz)
15 10K 20K
50K .1M .2M .5M 1M FREQUENCY, F (Hz)
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA81J * PA82J
GENERAL
Please read Application Note 1 , which covers stability, supplies, heatsinking, mounting, current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application notes. For information on the package outline, heatsinks, and mounting hardware, consult the "Accessory and Package Mechanical Data" section of the handbook.
OPERATING CONSIDERATIONS
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.
50K 2.5K +210V 50K 2.5/10V
D/A
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 70C. Exceeding this case temperature range can result in an inoperative circuit due to excessive input errors or activation of the thermal shutdown.
+VS
+210V
50K +210V +50/+200V
2.5K
PA82J
FIGURE 3. TRUE SINGLE SUPPLY OPERATION
50K
Figure 4 illustrates a very common deviation from true single 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
FIGURE 2. PROTECTION, INDUCTIVE LOAD
-VS
+12V 0/5V
D/A
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.
2K
PA81J 0/-125V
FIGURE 4. NON-SYMMETRIC SUPPLIES
-130V
This data sheet has been carefully CORPORATION * 5980 NORTH SHANNON ROAD assumed for possible inaccuracies or USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 APEX MICROTECHNOLOGY checked and is believed to be reliable, however, no responsibility*isTUCSON, ARIZONA 85741 * omissions. All specifications are subject to change without notice. PA81, 82U REV. G JANUARY 2000 (c) 2000 Apex Microtechnology Corp.

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