CA3280, CA3280A
®
Data Sheet
May 2002
Dual, 9MHz, Operational
Transconductance Amplifier (OTA)
FN1174.6
Features
• Low Initial Input Offset Voltage: 500µV (Max) (CA3280A)
The CA3280 and CA3280A types consist of two variable
operational amplifiers that are designed to substantially reduce
the initial input offset voltage and the offset voltage variation
with respect to changes in programming current. This design
results in reduced “AGC thump,” an objectionable characteristic
of many AGC systems. Interdigitation, or crosscoupling, of
critical portions of the circuit reduces the amplifier dependence
upon thermal and processing variables.
The CA3280 has all the generic characteristics of an
operational voltage amplifier except that the forward transfer
characteristics is best described by transconductance rather
than voltage gain, and the output is current, not voltage. The
magnitude of the output current is equal to the product of
transconductance and the input voltage. This type of
operational transconductance amplifier was first introduced in
1969, and it has since gained wide acceptance as a gateable,
gain controlled building block for instrumentation and audio
applications, such as linearization of transducer outputs,
standardization of widely changing signals for data processing,
multiplexing, instrumentation amplifiers operating from the
nanopower range to high current and high speed comparators.
For additional application information on this device and on
OTAs in general, please refer to Application Notes: AN6818,
AN6668, and AN6077.
• Low Offset Voltage Change vs IABC: <500µV (Typ)
for All Types
• Low Offset Voltage Drift: 5µV/oC (Max) (CA3280A)
• Excellent Matching of the Two Amplifiers for All
Characteristics
• Internal Current-Driven Linearizing Diodes Reduce the
External Input Current to an Offset Component
• Flexible Supply Voltage Range . . . . . . . . . . ±2V to ±15V
Applications
• Voltage Controlled Amplifiers
• Voltage Controlled Oscillators
• Multipliers
• Demodulators
• Sample and Hold
• Instrumentation Amplifiers
• Function Generators
• Triangle Wave-to-Sine Wave Converters
• Comparators
• Audio Preamplifier
Pinout
CA3280 (PDIP)
TOP VIEW
ID, A1 1
A1
+
-
EMITTER, A1 2
Functional Diagram
16 +IN, A1
15 -IN, A1
14
1/2 CA3280
11
14 V+, A1
IABC, A1 3
V- 4
13 OUT, A1
NC 5
12 OUT, A2
EMITTER, A2 7
-
11 V+, A2
IABC, A2 6
+
10
9 +IN, A2
7
2
10 -IN, A2
A2
ID, A2 8
15
+ 16
13
9
2K
2K
12
1
Ordering Information
8
4
PART NUMBER
CA3280AE
CA3280E
TEMP.
RANGE (oC)
PACKAGE
PKG.
NO.
-55 to 125
16 Ld PDIP
16 Ld PDIP
6
E16.3
0 to 70
3
E16.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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