Intersil Corporation CA3280A, CA3280 Datasheet
CA3280, CA3280A
Data Sheet September 1998 File Number 1174.4
Dual, 9MHz, Operational
Transconductance Amplifier (OTA)
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 v ariation
with respect to changes in programming current. This design
results in reduced“AGCthump,”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 f or 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.
Pinout
CA3280
(PDIP, CERDIP)
TOP VIEW
Features
• Low Initial Input Offset Voltage: 500µV (Max) (CA3280A)
• Low Offset Voltage Change vs I
: <500µV (Typ)
ABC
for All Types
• Low Offset Voltage Drift: 5µV/
o
C (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
Ordering Information
PART NUMBER
TEMP.
RANGE (oC) PACKAGE
PKG.
NO.
ID, A1
EMITTER, A1
, A1
I
ABC
NC
, A2
I
ABC
EMITTER, A2
ID, A2
+IN, A1
1
A1
2
3
4
V-
5
6
7
A2
8
16
+
-
15
-IN, A1
V+, A1
14
13
OUT, A1
OUT, A2
12
V+, A2
11
-IN, A2
10
-
+
9
+IN, A2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
CA3280AE -55 to 125 16 Ld PDIP E16.3
CA3280E 0 to 70 16 Ld PDIP E16.3
CA3280AF3 -55 to 125 16 Ld CERDIP F16.3
1-888-INTERSIL or 321-724-7143
| Copyright © Intersil Corporation 1999
.Functional Diagram
CA3280, CA3280A
1/2 CA3280
-
15
10
+
16
9
1
8
2K 2K
6
3
14
11
7
2
13
12
4
2
CA3280, CA3280A
Absolute Maximum Ratings Thermal Information
Supply Voltage (Between V+ and V-). . . . . . . . . . . . . . . . . . . . +36V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V-
Input Current at ID = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100µA
Amplifier Bias Current (I
). . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
ABC
Output Short Circuit Duration (Note 1). . . . . . . . . . . . . . . . Indefinite
Linearizing Diode Bias Current, ID. . . . . . . . . . . . . . . . . . . . . . . 5mA
Peak Input Current with Linearizing Diode. . . . . . . . . . . . . . . . . . ±I
D
Operating Conditions
Temperature Range
CA3280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
CA3280A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Supply Voltage Range (Typ) . . . . . . . . . . . . . . . . . . . . .±2V to ±15V
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Short circuit may be applied to ground or to either supply.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Thermal Resistance (Typical, Note 2) θJA (oC/W) θJC (oC/W)
CERDIP Package. . . . . . . . . . . . . . . . . 65 16
PDIP Package . . . . . . . . . . . . . . . . . . . 100 N/A
Maximum Junction Temperature (CERDIP P a ckage). . . . . . . . .175oC
Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC
Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
Electrical Specifications For Equipment Design, at T
P ARAMETER SYMBOL TEST CONDITIONS
Input Offset Voltage V
Input Offset Voltage Drift |∆VIO|I
Amplifier Bias Voltage V
Peak Output Voltage VOM+I
VOM- 12 -14.3 - -13.3 -14.3 - V
VOM+I
VOM- 12 -14.5 - -13.5 -14.5 - V
Common Mode Input Voltage
V
Range
Noise Voltage e
Input Offset Current I
Input Bias Current I
Peak Output Current IOM+I
IOM- Sink -350 -410 -650 -350 -410 -650 µA
IOM+I
IOM- Sink -3 -4.1 -7 -3 -4.1 -7 µA
I
IO
ABC
I
ABC
I
ABC
I
ABC
TA= Full Temp. Range
ABC
I
ABC
Temperature Range
ABCIABC
ABC
ABC
ICRIABC
I
N
ABC
I
IO
ABC
I
IB
ABC
I
ABC
Temperature Range
ABC
ABC
= 1mA - - 3 - - 0.5 mV
= 100µA - 0.7 3 - 0.25 0.5 mV
= 10µA - - 3 - - 0.5 mV
= 1mA to 10µA,
= 1µA to 1mA - 0.5 1 - 0.5 1 mV
= 100µA, TA = Full
= 100µA - 1.2 - - 1.2 - V
= 500mA 12 13.7 - 12.5 13.7 - V
= 5µA 12 13.9 - 12.5 13.9 - V
= 100µA -13 - 13 -13 - 13 V
= 500µA 10Hz - 20 - - 20 - nV/√Hz
= 500µA -Z 0.3 0.7 - 0.3 0.7 µA
= 500µA - 1.8 5 - 1.8 5 µA
= 500µA, TA = Full
= 500µA Source 350 410 650 350 410 650 µA
= 5µA Source 3 4.1 7 3 4.1 7 µA
= 25oC, V
A
= ±15V, Unless Otherwise Specified
SUPPLY
CA3280 CA3280A
- 0.8 4 - 0.8 1.5 mV
-5- - 3 5µV/oC
1kHz - 8 - - 8 - nV/√Hz
10kHz - 7 - - 7 - nV/√Hz
-38- 3 8 µA
UNITSMIN TYP MAX MIN TYP MAX
3
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