APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
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
1
2
3
4
5
6
7
8
V
S
+IN
IN
BAL
N.C.
OUTPUT
BAL
+V
S
NOTE: Input offset trimpot optional.
Recommended value of 100K .
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
H T T P : / / W W W . A P E X M I C R O T E C H . C O M ( 8 0 0 ) 5 4 6 - A P E X ( 8 0 0 ) 5 4 6 - 2 7 3 9
M I C R O T E C H N O L O G Y
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA81J PA82J SERIES
2
7
4
3
5
6
1
Q1
Q2
D1
D2
Q15
Q12B
Q9
C4
Q8
Q13
Q4
Q3
C1
Q16
Q17
Q5
C5
Q12A
Q14
C6
C2
C3
Q11
Q6
Q7
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
200V
300V
OUTPUT CURRENT, within SOA
Internally Limited
POWER DISSIPATION, internal
11.5W
11.5W
INPUT VOLTAGE, differential
150V
300V
INPUT VOLTAGE, common mode
V
S
V
S
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 CONDITIONS
2
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
T
C
= 25
C
1.5
3
*
*
mV
OFFSET VOLTAGE, vs. temperature
Full temperature range
10
25
*
*
V/
C
OFFSET VOLTAGE, vs. supply
T
C
= 25
C
20
*
V/V
OFFSET VOLTAGE, vs. time
T
C
= 25
C
75
*
V/
kh
BIAS CURRENT, initial
T
C
= 25
C
5
50
*
*
pA
BIAS CURRENT, vs. supply
T
C
= 25
C
.2
*
pA/V
OFFSET CURRENT, initial
T
C
= 25
C
2.5
50
*
*
pA
INPUT IMPEDANCE, DC
T
C
= 25
C
10
11
*
INPUT CAPACITANCE
T
C
= 25
C
10
*
pF
COMMON MODE VOLTAGE RANGE
2
Full temperature range
V
S
10
*
V
COMMON MODE REJECTION, DC
V
CM
=
20V
110
*
dB
GAIN
OPEN LOOP GAIN at 10Hz
Full load
94
116
100
118
dB
UNITY GAIN BANDWIDTH
T
C
= 25
C
5
*
MHz
POWER BANDWIDTH
T
C
= 25
C, full load
60
30
kHz
PHASE MARGIN
Full temperature range
45
*
OUTPUT
VOLTAGE SWING
2
T
C
= 25
C, I
PK
V
S
5
*
V
CURRENT, peak
T
C
= 25
C
30
15
mA
CURRENT, limit
T
C
= 25
C
50
25
mA
SETTLING TIME to .1%
T
C
= 25
C, 10V step
12
*
s
SLEW RATE
4
T
C
= 25
C
20
*
V/
s
CAPACITIVE LOAD
A
V
= 1
10
*
nF
POWER SUPPLY
VOLTAGE
Full temperature range
32
75
75
70
150
150
V
CURRENT, quiescent
T
C
= 25
C
6.5
8.5
6.5
8.5
mA
THERMAL
RESISTANCE, AC, junction to case
3
F > 60Hz
6
*
C/W
RESISTANCE, DC, junction to case
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
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.
+V
S
and V
S
denote the positive and negative supply rail respectively. Total V
S
is measured from +V
S
to V
S
.
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
(C)
2
6
8
12
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
50
100
80
120
130
CURRENT LIMIT
100
70
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, V
N
(nV/ Hz)
1
FREQUENCY, F (Hz)
20
0
60
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
20
40
80
100
10
210
150
60
0
PHASE RESPONSE
90
30
FREQUENCY, F (Hz)
OUTPUT VOLTAGE, V (V )
O
HARM0NIC DISTORTION
DISTORTION (%)
90
POWER SUPPLY (% OF MAX)
0.7
SLEW RATE
NORMALIZED SLEW RATE
0.8
1.0
COMMON MODE VOLTAGE
COMMON MODE VOLTAGE, V
CM
(V
PP
)
1
FREQUENCY, F (Hz)
COMMON MODE REJECTION
COMMOM MODE REJECTION, CMR (dB)
40
80
120
10
100
1
FREQUENCY, F (Hz)
POWER SUPPLY REJECTION
POWER SUPPLY REJECTION, PSR (dB)
15
45
85
64
BIAS CURRENT
NORMALIZED CURRENT LIMIT, (%)
4
INPUT NOISE
25
25
50
75
110
POWER RESPONSE
PP
40
50
60
70
80
5
25
65
.06
.25
1K
100K
10
PHASE, (
)
NORMALIZED BIAS CURRENT, I
B
(X)
1
20
60
100
10
100
0
20
40
60
80
100
0.9
90
256
180
120
0
60
125
100 1K 10K .1M
100 110
4
0
10K
1M
10M
1
105
120
100
10
1M 10M
FREQUENCY, F (Hz)
140
0
1K
10K
1M
1K
10K 1M
120
140
100
.1M
50K
.5M
15
30
60
200
300
25K
.15M .25M.35M
3
.1
.01
.003
.03
1
.3
1K
10K
100K
3K
100 300
30K
.1M
.1M
30
60
100
200
300
15
1M
10K
.1M
20K
50K
.2M
.5M
2
4
6
10
20
10
1K
10K
.1M
100
T = T
A
T = T
C
V
S
+V
S
PA81J/PA82J
PA82J
R
L
= 10K
100V
RMS
PA81J
R
L
= 2K
40V
RMS
+25
C TO +85
C
25
C
PA82J
PA81J
CASE TEMPERATURE, T
C
(C)
CASE TEMPERATURE, T
C
(C)
FREQUENCY, F (Hz)
PA82J
PA81J
16
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.
+V
S
V
S
FIGURE 2.
PROTECTION,
INDUCTIVE LOAD
+210V
50K
PA82J
FIGURE 3.
TRUE SINGLE
SUPPLY OPERATION
D/A
+50/+200V
+210V
50K
2.5K
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
2K
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.
PA81, 82U REV. G JANUARY 2000
2000 Apex Microtechnology Corp.
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