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參數資料
| 型號： | PA98A |
| 英文描述： | Operational Amplifier |
| 中文描述： | 運算放大器 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 71K |
| 代理商： | PA98A |
APEX MICROTECHNOLOGY CORPORATION
TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
1
FEATURES
HIGH VOLTAGE — 450V (
±
225V)
HIGH SLEW RATE — 1000V/
μ
S
HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
HIGH VOLTAGE INSTRUMENTATION
PIEZO TRANSDUCER EXCITATION
PROGRAMMABLE POWER SUPPLIES UP TO 430V
ELECTROSTATIC TRANSDUCERS & DEFLECTION
DESCRIPTION
The PA98 is a high voltage, high power bandwidth MOSFET
operational amplifier designed for output currents up to 200mA.
Output voltages can swing up to
±
215V with a dual supply and
up to +440 volts with a single supply. The safe operating area
(SOA) has no second breakdown limitations and can be
observed with all types of loads by choosing an appropriate
current limiting resistor. High accuracy is achieved with a
cascode input circuit configuration. All internal biasing is
referenced to a bootstrapped zener-MOSFET current source.
As a result, the PA98 features an unprecedented supply range
and excellent supply rejection. The MOSFET output stage is
biased on for linear operation. External compensation pro-
vides user flexibility.
This hybrid circuit utilizes thick film (cermet) resistors, ce-
ramic capacitors and silicon semiconductor chips to maximize
reliability, minimize size and give top performance. Ultrasoni-
cally bonded aluminum wires provide reliable interconnec-
tions at all operating temperatures.
EQUIVALENT SCHEMATIC
PATENTED
Dynamic focusing is the active correction of focusing volt-
age as a beam traverses the face of a CRT. This is necessary
in high resolution flat face monitors since the distance be-
tween cathode and screen varies as the beam moves from the
center of the screen to the edges. PA98 lends itself well to this
function since it can be connected as a summing amplifier with
inputs from the nominal focus potential and the dynamic
correction. The nominal might be derived from a potentiom-
eter, or perhaps automatic focusing circuitry might be used to
generate this potential. The dynamic correction is generated
from the sweep voltages by calculating the distance of the
beam from the center of the display.
PHASE COMPENSATION
Gain
1
20
100
C
68pF
10pF
3.3pF
R
C
100
330
0
C
C
RATED FOR FULL SUPPLY VOLTAGE
1
2
3
4
5
6
7
8
9
10
–IN
+IN
R
CL
+Vs
–Vs
TO LOAD
AND FEEDBACK
11
12
Rc
Cc
*
*
* Bypassing required.
NC
EXTERNAL CONNECTIONS
PACKAGE: SIP03
z = x + y
2
IN1
R
F
R
CL
R
+225V
±
225V
PA98
IN2
R
DC
FOCUS
X SWEEP
SAMPLE
Y SWEEP
SAMPLE
TO
FOCUS
GRID
DYNAMIC FOCUSING
TYPICAL APPLICATION
9
C
6
12
+V
S
11
+V
S
7
2
1
5
4
COMP
OUT
–V
S
–V
S
10
C
L
L
8
Q1
Q2
Q4
Q8
Q9
Q6
Q7
Q12
Q10A
Q10B
Q11
Q17
Q13
Q16
Q18
D1
D23
D2
–IN
+IN
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
M I C R O T E C H N O L O G Y
POWER OPERATIONAL AMPLIFIERS
PA98 PA98A
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