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ETC - HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

Numéro de référence PA81J
Description HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
Fabricant ETC 
Logo ETC 





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PA81J fiche technique
MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA81J • PA82J SERIES
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
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
BAL
+VS
2
3
BAL
4
1 OUTPUT
TOP VIEW
–IN 5
6
+IN
7
–VS
8
N.C.
NOTE: Input offset trimpot optional.
Recommended value of 100K.
±1mA
D/A
+75V
70K
PA81J
.47
±70V
.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
2
3
Q1
Q5
C2
Q8
C5 C4
5 Q12A
Q13
Q14
6 Q15
C6
7
D1
Q2
Q4
C3
Q9
Q12B
Q11
C1
Q3
Q6
Q7
1
Q16
D2
Q17
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]

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