Apex PA81J, PA82J Datasheet

+75V
–75V
70K
PA81J
HIGH VOLTAGE PROGRAMMABLE POWER SUPPLY
±1mA
D/A
.47
.47
±70V
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA81J • PA82J SERIES
MICROTECHNOLOGY
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
• BIOCHEMISTRY STIMULATORS
• COMPUTER TO VACUUM TUBE INTERFACE
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.
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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
EXTERNAL CONNECTIONS
+V
3
TOP VIEW
6
–V
S
2
1
8
7
N.C.
S
BAL
BAL
4
–IN
5
+IN
NOTE: Input offset trimpot optional. Recommended value of 100K .
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
OUTPUT
4 2
3
5
6
7
Q1
Q5
C2
Q8
C5
C6
C4
Q12A
Q13 Q14
Q15
Q2
Q9
Q12B
D1
Q4
C3
Q11
D2
Q3
Q16
C1
Q6
Q7
1
Q17
PA81J PA82J
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA81J PA82J
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –V OUTPUT CURRENT, within SOA Internally Limited
S
200V 300V
POWER DISSIPATION, internal 11.5W 11.5W INPUT VOLTAGE, differential ±150V ±300V INPUT VOLTAGE, common mode ±V TEMPERATURE, pin solder - 10 sec 300°C 300°C
S
±V
S
TEMPERATURE, junction 150°C 150°C TEMPERATURE RANGE, storage –65 to +125°C –65 to +125°C OPERATING TEMPERATURE RANGE, case –55 to +125°C –55 to +125°C
SPECIFICATIONS
PARAMETER TEST CONDITIONS
PA81J
2
MIN TYP MAX MIN TYP MAX UNITS
PA82J
INPUT
OFFSET VOLTAGE, initial TC = 25°C ±1.5 ±3**mV OFFSET VOLTAGE, vs. temperature Full temperature range 10 25 * * µV/°C OFFSET VOLTAGE, vs. supply TC = 25°C20*µV/V OFFSET VOLTAGE, vs. time TC = 25°C75*µV/√kh BIAS CURRENT, initial TC = 25°C550**pA BIAS CURRENT, vs. supply TC = 25°C .2 * pA/V OFFSET CURRENT, initial TC = 25°C 2.5 50 * * pA INPUT IMPEDANCE, DC TC = 25°C10
11
* INPUT CAPACITANCE TC = 25°C10*pF COMMON MODE VOLTAGE RANGE2Full temperature range ±VS–10 * V COMMON MODE REJECTION, DC VCM = ±20V 110 * dB
GAIN
OPEN LOOP GAIN at 10Hz Full load 94 116 100 118 dB UNITY GAIN BANDWIDTH TC = 25°C 5 * MHz POWER BANDWIDTH TC = 25°C, full load 60 30 kHz PHASE MARGIN Full temperature range 45 * °
OUTPUT
VOLTAGE SWING CURRENT, peak TC = 25°C3015mA
2
TC = 25°C, I
PK
±VS–5* V
CURRENT, limit TC = 25°C5025mA SETTLING TIME to .1% TC = 25°C, 10V step 12 * µs SLEW RATE
4
TC = 25°C20*V/µs
CAPACITIVE LOAD AV = 1 10 * nF
POWER SUPPLY
VOLTAGE Full temperature range ±32 ±75 ±75 ±70 ±150 ±150 V CURRENT, quiescent TC = 25°C 6.5 8.5 6.5 8.5 mA
THERMAL
RESISTANCE, AC, junction to case RESISTANCE, DC, junction to case
3
F > 60Hz 6 * °C/W
3
F < 60Hz 9 10 * * °C/W RESISTANCE, junction to air Full temperature range 30 * °C/W TEMPERATURE RANGE, shutdown 150 * °C TEMPERATURE RANGE, case Meets full range specification 0 70 * * °C
NOTES: * 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
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
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.
TYPICAL PERFORMANCE GRAPHS
PA81J • PA82J
POWER DERATING
12
T = T
10
INTERNAL POWER DISSIPATION, P(W)
120 100
80 60 40 20
OPEN LOOP GAIN, A (dB)
–20
.3
.1
.03
DISTORTION (%)
.01
.003
C
8
6
4
T = T
A
2
0
0 25 50 75 100 125
TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE
0
10010
1
FREQUENCY, F (Hz)
HARM0NIC DISTORTION
3
1
PA81J R
L
40V
300 30K
100
FREQUENCY, F (Hz)
10K 1M 10M
1K 100K
= 2K
RMS
1K 10K 100K3K
PA82J R
= 10K
L
100V
RMS
130 120 110
100
90 80 70 60
NORMALIZED CURRENT LIMIT, (%)
0
306090
Φ
–120
PHASE, (°)
150180210
CURRENT LIMIT
50 100
25 25 50 75
0
CASE TEMPERATURE, T
PHASE RESPONSE
10
1
1K 10K
100
FREQUENCY, F (Hz)
.1M
SLEW RATE
1.0
0.9
+25°C TO +85
0.8
NORMALIZED SLEW RATE
0.7 40 50 60 70 80
POWER SUPPLY (% OF MAX)
°C
25°C
90
256
BIAS CURRENT
(X)
B
64
16
4
1
.25
.06
125
(°C) CASE TEMPERATURE, TC (°C)
C
1M
10M
100 110
NORMALIZED BIAS CURRENT, I
–15 45 85
525 65
300 200
PP
O
100
POWER RESPONSE
PA82J
PA81J
60
30
OUTPUT VOLTAGE, V (V )
15
25K
50K
.1M
.15M
20
FREQUENCY, F (Hz)
INPUT NOISE
(nV/ Hz)
N
10
6
4
2
INPUT NOISE VOLTAGE, V
10 1K 10K
100
FREQUENCY, F (Hz)
.25M
.35M
105
.5M
.1M
COMMON MODE REJECTION
140
120
100
80 60 40 20
0
1
COMMOM MODE REJECTION, CMR (dB)
10 100
FREQUENCY, F (Hz)
PA81J/PA82J
1K 10K 1M
.1M
POWER SUPPLY REJECTION
140 120
100
80 60
40 20
0
POWER SUPPLY REJECTION, PSR (dB)
FREQUENCY, F (Hz)
10 100
1
1K 10K 1M
–V
+V
S
.1M
S
COMMON MODE VOLTAGE
)
300
PP
PA82J
(V
200
CM
PA81J
100
60
30
15
10K
COMMON MODE VOLTAGE, V
20K
.1M
50K
FREQUENCY, F (Hz)
.2M .5M
1M
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.
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.
+V
S
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
2.5/10V
D/A
FIGURE 3.
TRUE SINGLE SUPPLY OPERATION
2.5K +210V
50K
2.5K
50K +210V
PA82J
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.
+210V
+50/+200V
FIGURE 2. PROTECTION, INDUCTIVE LOAD
–V
S
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.
0/5V
FIGURE 4. NON-SYMMETRIC SUPPLIES
D/A
2K
50K
+12V
PA81J
0/–125V
–130V
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.
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.
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
PA81, 82U REV. G JANUARY 2000 © 2000 Apex Microtechnology Corp.
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