Datasheet PA81J, PA82J Datasheet (Apex)

+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

• PROGRAMMABLE POWER SUPPLIES TO ±145V

• 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 .

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OUTPUT

4
2

3

5

6

Ω

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

* Ω
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

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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

Ω

= 2K

RMS

1K 10K 100K3K

PA82J
R

= 10K

L

100V

RMS

Ω

130
120
110

100

90
80
70
60

NORMALIZED CURRENT LIMIT, (%)

0

–30
–60
–90

Φ

–120

PHASE, (°)

–150
–180
–210

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

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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: [phone]

PA81, 82U REV. G JANUARY 2000 © 2000 Apex Microtechnology Corp.