PA82J Series - Apex Microtechnology

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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 pro-

vides 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 ca-

pacitors and silicon semiconductors to maximize reliability,

minimize size and give top performance. Ultrasonically bonded

aluminum wires provide reliable interconnections at all operat-

ing 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.

EXTERNAL CONNECTIONS

TOP VIEW

–VS

+IN

–IN

BAL

N.C.

OUTPUT

BAL +VS

NOTE: Input offset trimpot optional.

Recommended value of 100K .

Ω

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

+75V

–75V

70K

PA81J

HIGH VOLTAGE PROGRAMMABLE POWER SUPPLY

±1mA

D/A .47

.47

±70V

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739

MICROTECHNOLOGY

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

PA81J • PA82J SERIES

Q1 Q2

Q15

Q12B

Q13

Q16 Q17

Q12A

Q14

C2 C3

Q11

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS200V 300V

OUTPUT CURRENT, within SOA Internally Limited

POWER DISSIPATION, internal 11.5W 11.5W

INPUT VOLTAGE, differential ±150V ±300V

INPUT VOLTAGE, common mode ±VS ±VS

TEMPERATURE, pin solder - 10 sec 300°C 300°C

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

PARAMETER TEST CONDITIONS2MIN TYP MAX MIN TYP MAX UNITS

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 SWING2TC = 25°C, IPK ±VS–5* V

CURRENT, peak TC = 25°C3015mA

CURRENT, limit TC = 25°C5025mA

SETTLING TIME to .1% TC = 25°C, 10V step 12 * µs

SLEW RATE4TC = 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 case3F > 60Hz 6 * °C/W

RESISTANCE, DC, junction to case3F < 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

PA82J

PA81J

PA81J •PA82J

PA81J PA82J

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.

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.

CAUTION

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

TYPICAL PERFORMANCE

GRAPHS PA81J • PA82J

0 25 50 75 100 125

TEMPERATURE, T

(°C)

POWER DERATING

INTERNAL POWER DISSIPATION, P(W)

–50 100

120

130

CURRENT LIMIT

100

FREQUENCY, F (Hz)

INPUT NOISE VOLTAGE, V

(nV/ Hz)

1FREQUENCY, F (Hz)

–20

SMALL SIGNAL RESPONSE

OPEN LOOP GAIN, A (dB)

100

–210

–150

–60

PHASE RESPONSE

–90

–30

FREQUENCY, F (Hz)

OUTPUT VOLTAGE, V (V )

HARM0NIC DISTORTION

DISTORTION (%)

POWER SUPPLY (% OF MAX)

0.7

SLEW RATE

NORMALIZED SLEW RATE

0.8

1.0

COMMON MODE VOLTAGE

COMMON MODE VOLTAGE, V

)

1FREQUENCY, F (Hz)

COMMON MODE REJECTION

COMMOM MODE REJECTION, CMR (dB)

120

10 100 1FREQUENCY, F (Hz)

POWER SUPPLY REJECTION

POWER SUPPLY REJECTION, PSR (dB)

–15 45 85

BIAS CURRENT

NORMALIZED CURRENT LIMIT, (%)

INPUT NOISE

√

–25 25 50 75

110

POWER RESPONSE

40 50 60 70 80

525 65

.06

.25

1K 100K

PHASE, (°)

NORMALIZED BIAS CURRENT, I

(X)

100

10 100

100

0.9

256

–180

–120

60 125

100 1K 10K .1M

100 110

10K 1M 10M 1

105

120

10010 1M 10M

FREQUENCY, F (Hz)

140

01K 10K 1M 1K 10K 1M

120

140

100

.1M

50K

.5M

200

300

25K .15M

.25M.35M

.01

.003

.03

1K 10K 100K3K

100 300 30K

.1M .1M

100

200

300

10K .1M

20K 50K .2M .5M

10 1K 10K .1M

100

T = T

–V

PA81J/PA82J

PA82J

= 10K

100V

RMS

Ω

PA81J

= 2K

40V

RMS

+25°C TO +85°C

–25°C

PA82J

PA81J

CASE TEMPERATURE, T

(°C) CASE TEMPERATURE, T

(°C)

FREQUENCY, F (Hz)

PA82J

PA81J

FREQUENCY, F (Hz)

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

OPERATING

CONSIDERATIONS

PA81J • PA82J

SINGLE SUPPLY OPERATION

These amplifiers are suitable for operation from a single

supply voltage. The operating requirements do however, im-

pose 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.

GENERAL

Please read Application Note 1 , which covers stability,

supplies, heatsinking, mounting, current limit, SOA interpreta-

tion, 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.

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.

+VS

–VS

FIGURE 2.

PROTECTION,

INDUCTIVE LOAD

+210V

50K

PA82J

FIGURE 3.

TRUE SINGLE

SUPPLY OPERATION

D/A

+50/+200V

+210V

50K

2.5K

2.5/10V

50K

+210V

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.

+12V

–130V

50K

PA81J

FIGURE 4.

NON-SYMMETRIC

SUPPLIES

0/5V

D/A

0/–125V

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.