and capacitive loads. Their complementary 鈥渃ollector output鈥?/div>
stage can swing close to the supply rails and is protected
against inductive kickback. For optimum linearity, the output
stage is biased for class A/B operation. The safe operating
area (SOA) can be observed for all operating conditions by
selection of user programmable, current limiting resistors
(down to 10mA). Both amplifiers are internally compensated
but are not recommended for use as unity gain followers. For
continuous operation under load, mounting on a heatsink of
proper rating is recommended.
These hybrid integrated circuits utilize thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated.
Isolation washers are not recommended. The use of com-
pressible thermal washers and/or improper mounting torque
will void the product warranty. Please see 鈥淕eneral Operat-
ing Considerations鈥?
LOW INTERNAL LOSS MAXIMIZES EFFICIENCY
When system voltages are low and power is at a premium,
the PA02 is a natural choice. The circuit above utilizes not only
the feature of low internal loss of the PA02, but also its very low
distortion level to implement a crystal clear audio amplifier
suitable even for airborne applications. This circuit uses AC
coupling of both the input signal and the gain circuit to render
DC voltage across the speaker insignificant. The resistor and
capacitor across the inputs form a stability enhancement
network. The 0.27 ohm current limit resistors provide protec-
tion in the event of an output short circuit.
EXTERNAL CONNECTIONS
R
CL+
+V
S
OUT
3
2
CL+
1
EQUIVALENT SCHEMATIC
2
R1
R2
R4
Q4
6
A1
5
Q5
R8
Q7
R9
R10
R11
7
R12
Q8
R13
Q6
8
R14
D2
4
R15
R3
Q2
R5
Q1
R6
R7
1
Q3
3
D1
OUT
4
TOP VIEW
5
鈥揑N
+IN
6
鈥揤
S
7
8
CL鈥?/div>
R
CL鈥?/div>
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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