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

• 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.

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]

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

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]

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.