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| 型號： | PA97 |
| 英文描述： | Operational Amplifier |
| 中文描述： | 運算放大器 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 39K |
| 代理商： | PA97 |
OPERATING
CONSIDERATIONS
PA97
GENERAL
Please read the
“
General Operating Considerations
”
sec-
tion, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpreta-
tion. 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.
CURRENT LIMIT
The PA97 has no provision for current limiting the output.
COMMON MODE INPUT RANGE
Operational amplifiers are usually designed to have a com-
mon mode input voltage range that approximates the power
supply voltage range. However, to keep the cost as low as
possible and still meet the requirements of most applications
the common mode input voltage range of the PA97 is re-
stricted. The input pins must always be a least 30V from either
supply voltage but never more than 500V. This means that the
PA97 cannot be used in applications where the supply volt-
ages are extremely unbalanced. For example, supply volt-
ages of +800V and
–
100V would not be allowed in an applica-
tion where the non-inverting pin is grounded because in normal
operation both input pins would be at 0V and the difference
voltage between the positive supply and the input pins would
be 800V. In this kind of application, however,
supply voltages
+500V and -100V does meet the input common mode voltage
range requirements since the maximum difference voltage
between the inputs pins and the supply voltage is 500V (the
maximum allowed). The output has no such restrictions on its
voltage swing. The output can swing within 24V of either
supply voltage regardless of value so long as the total supply
voltage does not exceed 900V.
INPUT PROTECTION
Although the PA97 can withstand differential input voltages
up to
±
20V, additional external protection is recommended. In
most applications 1N4148 or 1N914 signal diodes are suffi-
cient (D1, D2 in Figure 2a). In more demanding applications
where low leakage or low capacitance are of concern 2N4416
or 2N5457-2N5459 JFETs connected as diodes will be re-
quired (Q1, Q2 in Figure 2b). In either case the input differential
voltage will be clamped to
±
.7V. This is sufficient overdrive to
produce maximum power bandwidth. Note that this protection
does not automatically protect the amplifier from excessive
common mode input voltages.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recom-
mended as protection on the supply pins. The zeners clamp
transients to voltages within the power supply rating and also
clamp power supply reversals to ground. Whether the zeners
are used or not, the system power supply should be evaluated
for transient performance including power-on overshoot and
power-off polarity reversal as well as line regulation.
Conditions which can cause open circuits or polarity rever-
sals on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is
known to induce input stage failure. Unidirectional transzorbs
prevent this, and it is desirable that they be both electrically and
physically as close to the amplifier as possible.
EXTERNAL COMPONENTS
The compensation capacitor Cc must be rated for the total
supply voltage. 10pF NPO (COG)capacitor rated at 1kV is
recommended.
Of equal importance is the voltage rating and voltage coef-
ficient of the gain setting feedback resistor. Typical voltage
ratings of low wattage resistors are 150 to 250V. Up to 900 V
can appear across the feedback resistor. High voltage rated
resistors can be obtained. However a 1 megohm feedback
resistor composed of five 200k resistors in series will produce
the proper voltage rating.
CAUTIONS
The operating voltages of the PA97 are potentially lethal.
During circuit design develop a functioning circuit at the lowest
possible voltages. Clip test leads should be used for "hands
off" measurements while troubleshooting. With no internal
current limit, proper choice of load impedance and supply
voltage is required to meed SOA limitiations. An output short
circuit will destroy the amplifier within milliseconds.
STABILITY
The PA97 is stable at gains of 10 or more with a NPO (COG)
compensation capacitor of 10pF. The compensation capaci-
tor, Cc, in the external connections diagram must be rated at
1000V working voltage and mounted closely to pins 4 and 6 to
prevent spurious oscillation. A compensation capacitor less
than 10pF is not recommended.
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.
PA97U REV. B AUGUST 2000
2000 Apex Microtechnology Corp.
PA97
+V
S
–
IN
+IN
Z1
Z2
D2
D1
12
10
1
2
+V
S
–
IN
+IN
Z1
Z2
12
10
1
2
PA97
Q1
Q2
A.
B.
–
V
S
–
V
S
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