鈥?/div>
TELEPHONE RING GENERATOR
PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
EQUIVALENT SCHEMATIC
13
D1
Q1
Q2
Q3
Q4
5
+V
S
DESCRIPTION
The PA44 is a high voltage monolithic MOSFET operational
amplifier achieving performance features previously found
only in hybrid designs while increasing reliability. Inputs are
protected from excessive common mode and differential mode
voltages. The safe operating area (SOA) has no second
breakdown limitations and can be observed with all type loads
by choosing an appropriate current limiting resistor. External
compensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
The PA44 is packaged in Apex's PSOP1 non-hermetic
surface mountable dual in line package. The metal back of the
package is tied to 鈥揤s.
Q5
19
I
LIM
15
Q7
Q6
21
鈥揑N
D2
7
COMP
D3
D4
D5
COMP Q8
17
Q9
OUT
+IN
Q11
Q12
Q13
Q10
Q14
鈥揤
S
12
TYPICAL APPLICATION
2.67K
140V
IN6300A
15V
2.5K + 15
.22
MUR130
3.3pF
10K
4
7
ICL8038
8
IN6300A
10
*
* 1.5
碌F
@ 16Hz
1.2
碌F
@ 20Hz
MUR120
鈥?5V
鈥?40V
MUR130
11
82K
.22
330pf
100
2
PA44
27
10K
5
6
MUR120
2.2K
100K
SUB
EXTERNAL CONNECTIONS
R
LIM
R
LIM
100鈩?/div>
R
C
21
90Vrms
C
C
17
COMP
15
I
LIM
13
+V
S
鈥揤
S
12
*
C
S
330pF
19
COMP
鈥揑N
5
OUT
1
NC
+IN
7
TOP VIEW
*
*
Supply bypassing required. See General Operating Considerations.
PHASE COMPENSATION
Gain
1
鈮?0
鈮?0
C
C
18pF
10pF
3.3pF
R
C
2.2K鈩?/div>
2.2K鈩?/div>
2.2K鈩?/div>
Telephone Ring Generator
The PA44 is set for a gain of 38.5 boosting the 2.33V signal
to 90V. The recommended compensation for gains above 30
is used. If capacitive loading is at least 330pF at all times, the
recommended snubber network may be omitted. The 27 ohm
resistor sets current limit to a nominal value of 111mA to insure
peak currents out of at least 78mA.
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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