CIRRUS PA82J

PA81J
• PA82J
PA81J
• PA82J
P r o d u c t IInPA82J
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PA81J,
High Voltage Power Operational Amplifiers
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
70K
+75V
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.
BAL
–IN
+VS
3
D/A
.47
–75V
HIGH VOLTAGE PROGRAMMABLE POWER SUPPLY
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
4
C1
D1
3
Q4
OUTPUT
Q5
4
5
Q8
C5
8
7
–VS
C3
C2
TOP VIEW
6
Q3
Q2
Q1
2
1
+IN
±70V
PA81J
2
EXTERNAL CONNECTIONS
BAL
.47
±1mA
N.C.
NOTE: Input offset trimpot optional.
Recommended value of 100KΩ
Q6
Q9
C4
Q7
Q12B
Q11
1
Q12A
5
Q13
Q14
6
Q16
Q17
Q15
C6
D2
7
PA81-82U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA81-82JUREVJ
PA81J • PA82J
ABSOLUTE MAXIMUM RATINGS
P r o d u c t I n n o v a t i o nF r o m
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
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
2
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
110
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
PA82J
MAX
MIN TYP
MAX
±3
*
*
25
*
*
*
*
50
*
*
*
50
*
*
*
*
*
*
UNITS
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
Ω
pF
V
dB
116
5
60
45
100
118
*
30
*
dB
MHz
kHz
°
50
12
20
10
*
15
25
*
*
*
V
mA
mA
µs
V/µs
nF
±75
6.5
±75
±70
8.5
±150
6.5
±150
8.5
6
9
30
150
*
10
*
*
*
*
70
*
*
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.
PA81-82U
PA81J • PA82J
POWER DERATING
8
6
T = TA
2
125
SMALL SIGNAL RESPONSE
120
70
60
–50
–30
80
–60
60
40
20
0
1
100 1K 10K 100K 1M
FREQUENCY, F (Hz)
10
–150
10
1
NORMALIZED SLEW RATE
.03
PA82J
RL = 10KΩ
100VRMS
.01
100 300
120
100
PA
80
81
J/P
A8
60
2J
40
20
0
1
PA81-82U
10
10K .1M
100 1K
FREQUENCY, F (Hz)
1M
5
+2
0.8
0.7
40
1K
3K
10K 30K 100K
FREQUENCY, F (Hz)
COMMON MODE REJECTION
C
°
85
°C
TO
+
°C
5
–2
50 60 70 80 90 100
POWER SUPPLY (% OF MAX)
110
POWER SUPPLY REJECTION
140
120
100
80
+VS
60
–VS
40
20
0
1
10
16
4
1
.25
.06
–15
45
85 105
5
25
65
CASE TEMPERATURE, TC (°C)
POWER RESPONSE
PA82J
200
PA81J
100
60
30
50K
.1M .15M .25M.35M.5M
FREQUENCY, F (Hz)
INPUT NOISE
20
1.0
0.9
64
15
25K
1M 10M
SLEW RATE
PA81J
RL = 2KΩ
40VRMS
.1
100 1K 10K .1M
FREQUENCY, F (Hz)
BIAS CURRENT
256
300
–120
HARM0NIC DISTORTION
.3
140
PHASE RESPONSE
–90
–210
10M
1
.003
–25 0
25 50 75 100 125
CASE TEMPERATURE, TC (°C)
–180
3
DISTORTION (%)
80
100
–20
COMMOM MODE REJECTION, CMR (dB)
90
0
PHASE, Ф (°)
OPEN LOOP GAIN, A (dB)
25
50
75
100
TEMPERATURE, TC (°C)
100
OUTPUT VOLTAGE, VO (VPP)
0
110
INPUT NOISE VOLTAGE, VN (nV/√Hz)
0
120
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
10
6
4
2
10
300
COMMON MODE VOLTAGE, VCM (VPP)
4
NORMALIZED BIAS CURRENT, IB (X)
T = TC
10
CURRENT LIMIT
130
NORMALIZED CURRENT LIMIT, (%)
12
POWER SUPPLY REJECTION, PSR (dB)
INTERNAL POWER DISSIPATION, P (W)
P r o d u c t I n n o v a t i o nF r o m
200
100
100
1K
10K
FREQUENCY, F (Hz)
.1M
COMMON MODE VOLTAGE
PA82J
PA81J
60
30
15
10K 20K
50K .1M .2M
.5M 1M
FREQUENCY, F (Hz)
3
PA81J • PA82J
P r o d u c t I n n o v a t i o nF r o m
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.Cirrus.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 Precision Power product models,
consult the "Evaluation Kit" section for details. For the most
current version of all Apex Precision Power product data sheets,
visit www.Cirrus.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.
4
+VS
FIGURE 2.
PROTECTION,
INDUCTIVE LOAD
–VS
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.
Figure 4 illustrates a very common deviation from true single
50K
2.5K
50K
+210V
2.5/10V
D/A
+210V
50K
2.5K
+210V
PA82J
+50/+200V
50K
FIGURE 3.
TRUE SINGLE
SUPPLY OPERATION
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.
50K
+12V
0/5V
D/A
FIGURE 4.
NON-SYMMETRIC
SUPPLIES
2K
PA81J
0/–125V
–130V
PA81-82U
P r o d u c t I n n o v a t i o nF r o m
PA81J • PA82J
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
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to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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PA81-82U
5