APEX PA82J

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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
8-PIN TO-3
PACKAGE STYLE CE
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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
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EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
PA81J • PA82J
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 2
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
TC = 25°C
Full temperature range
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
Full temperature range
VCM = ±20V
GAIN
OPEN LOOP GAIN at 10Hz
UNITY GAIN BANDWIDTH
POWER BANDWIDTH
PHASE MARGIN
Full load
TC = 25°C
TC = 25°C, full load
Full temperature range
OUTPUT
VOLTAGE SWING2
CURRENT, peak
CURRENT, limit
SETTLING TIME to .1%
SLEW RATE4
CAPACITIVE LOAD
TC = 25°C, IPK
TC = 25°C
TC = 25°C
TC = 25°C, 10V step
TC = 25°C
AV = 1
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
Full temperature range
TC = 25°C
THERMAL
RESISTANCE, AC, junction to case3
RESISTANCE, DC, junction to case3
RESISTANCE, junction to air
TEMPERATURE RANGE, shutdown
TEMPERATURE RANGE, case
NOTES: *
1.
2.
3.
4.
CAUTION
PA81J
PA82J
200V
300V
Internally Limited
11.5W
11.5W
±150V
±300V
±VS
±VS
300°C
300°C
150°C
150°C
–65 to +125°C
–65 to +125°C
–55 to +125°C
–55 to +125°C
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
MIN
±VS–10
94
±VS–5
30
±32
F > 60Hz
F < 60Hz
Full temperature range
Meets full range specification
0
PA81J
TYP
±1.5
10
20
75
5
.2
2.5
1011
10
MAX
±3
25
50
50
*
110
116
5
60
45
100
*
15
50
12
20
10
±75
6.5
6
9
30
150
MIN
±75
8.5
±70
10
70
*
PA82J
TYP
MAX
UNITS
*
*
*
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
Ω
pF
V
dB
118
*
30
*
dB
MHz
kHz
°
25
*
*
*
V
mA
mA
µs
V/µs
nF
*
*
*
*
*
*
*
*
*
±150
6.5
*
*
*
*
*
*
±150
8.5
*
*
V
mA
°C/W
°C/W
°C/W
°C
°C
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 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
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TYPICAL PERFORMANCE
GRAPHS
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PA81J • PA82J
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
OPERATING
CONSIDERATIONS
PA81J • PA82J
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.apexmicrotech.com for design tools
that help automate tasks such as calculations for stability, internal power dissipation, current limit and heat sink selection.
The "Application Notes" and "Technical Seminar" sections
contain a wealth of information on specific types of applications.
Package outlines, heat sinks, mounting hardware and other
accessories are located in the "Packages and Accessories"
section. Evaluation Kits are available for most Apex product
models, consult the "Evaluation Kit" section for details. For
the most current version of all Apex product data sheets, visit
www.apexmicrotech.com.
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.
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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.
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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.
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This data
sheet has been carefullyCORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specifications HOTLINE:
are subject to1change
without
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)
546-2739
4
PA81_82JU REV H MARCH 2001
© 2001 Apex Microtechnology Corp.