SEMICONDUCTOR
3-45
November 1996
CA3080, CA3080A
2MHz, Operational
Transconductance Amplifier (OTA)
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1996 File Number 475.3
Features
• Slew Rate (Unity Gain, Compensated). . . . . . . . 50V/µs
• Adjustable P o wer Consumption . . . . . . . . . 10µW to 30µW
• Flexible Supply Voltage Range . . . . . . . . . . ±2V to ±15V
• Fully Adjustable Gain . . . . . . . . . . . . . .0 to gMRL Limit
• Tight gM Spread:
- CA3080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2:1
- CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6:1
• Extended gM Linearity. . . . . . . . . . . . . . . . . . 3 Decades
Applications
• Sample and Hold • Multiplier
• Multiplexer • Comparator
• Voltage Follower
Description
The CA3080 and CA3080A types are Gatable-Gain Blocks
which utilize the unique operational-transconductance-
amplifier (OTA) concept described in Application Note
AN6668, “Applications of the CA3080 and CA3080A High-
Performance Operational Transconductance Amplifiers”.
The CA3080 and CA3080A types have differential input and a
single-ended, push-pull, class A output. In addition, these types
hav e an amplifier bias input which ma y be used either f or gating
or for linear gain control. These types also have a high output
impedance and their transconductance (gM) is directly
proportional to the amplifier bias current (IABC).
The CA3080 and CA3080A types are notable for their excellent
slew rate (50V/µs), which makes them especially useful for
multiplexer and fast unity-gain voltage followers. These types
are especially applicable for multiplexer applications because
power is consumed only when the devices are in the “ON”
channel state.
The CA3080A’s characteristics are specifically controlled for
applications such as sample-hold, gain-control, multiple xing, etc.
Pinouts
Ordering Information
PART NUMBER
(BRAND) TEMP.
RANGE (oC) PACKAGE PKG.
NO.
CA3080 0 to 70 8 Pin Metal Can T8.C
CA3080A -55 to 125 8 Pin Metal Can T8.C
CA3080AE -55 to 125 8 Ld PDIP E8.3
CA3080AM
(3080A) -55 to 125 8 Ld SOIC M8.15
CA3080AM96
(3080A) -55 to 125 8 Ld SOIC Tape
and Reel M8.15
CA3080E 0 to 70 8 Ld PDIP E8.3
CA3080M
(3080) 0 to 70 8 Ld SOIC M8.15
CA3080M96
(3080) 0 to 70 8 Ld SOIC Tape
and Reel M8.15
CA3080
(PDIP, SOIC)
TOP VIEW
CA3080
(METAL CAN)
TOP VIEW
NOTE: Pin 4 is connected to case.
1
2
3
4
8
7
6
5
+
V+
NC
INV.
INPUT
V-
NON-INV.
INPUT
NC
OUTPUT
AMPLIFIER
BIAS INPUT
-OUTPUT
BIAS
2
4
6
1
3
7
5
8
+
TAB
V+
V-
NON-INV.
INPUT
INV.
INPUT -
3-46
Absolute Maximum Ratings Thermal Information
Supply Voltage (Between V+ and V- Terminal). . . . . . . . . . . . . . 36V
Differential Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V-
Input Signal Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA
Amplifier Bias Current (IABC) . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Output Short Circuit Duration (Note 1). . . . . . . . . . . . No Limitation
Operating Conditions
Temperature Range
CA3080. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Thermal Resistance (Typical, Note 2) θJA (oC/W) θJC (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . 130 N/A
SOIC Package. . . . . . . . . . . . . . . . . . . 170 N/A
Metal Can Package . . . . . . . . . . . . . . . 200 120
Maximum Junction Temperature (Metal Can) . . . . . . . . . . . . . 175oC
Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
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.
Electrical Specifications For Equipment Design, VSUPPLY =±15V, Unless Otherwise Specified
PARAMETER TEST CONDITIONS TEMP
CA3080 CA3080A
UNITSMIN TYP MAX MIN TYP MAX
Input Offset Voltage IABC = 5µA 25 - 0.3 - - 0.3 2 mV
IABC = 500µA 25 - 0.4 5 - 0.4 2 mV
Full - - 6 - - 5 mV
Input Offset Voltage Change IABC = 500µA to 5µA 25 - 0.2 - - 0.1 3 mV
Input Offset Voltage Temp. Drift IABC = 100µA Full - - - - 3.0 - µV/oC
Input Offset Voltage
Sensitivity Positive IABC = 500µA 25 - - 150 - - 150 µV/V
Negative 25 - - 150 - - 150 µV/V
Input Offset Current IABC = 500µA 25 - 0.12 0.6 - 0.12 0.6 µΑ
Input Bias Current IABC = 500µA25-25-25µA
Full - - 7 - - 15 µA
Differential Input Current IABC = 0, VDIFF = 4V 25 - 0.008 - - 0.008 5 nA
Amplifier Bias Voltage IABC = 500µA 25 - 0.71 - - 0.71 - V
Input Resistance IABC = 500µA 251026-1026-kΩ
Input Capacitance IABC = 500µA, f = 1MHz 25 - 3.6 - - 3.6 - pF
Input-to-Output Capacitance IABC = 500µA, f = 1MHz 25 - 0.024 - - 0.024 - pF
Common-Mode Input-Voltage
Range IABC = 500µA 25 12 to
-12 13.6 to
-14.6 - 12 to
-12 13.6 to
-14.6 -V
Forward Transconductance
(Large Signal) IABC = 500µA 25 6700 9600 13000 7700 9600 12000 µS
Full 5400 - - 4000 - - µS
Output Capacitance IABC = 500µA,f = 1MHz 25 - 5.6 - - 5.6 - pF
Output Resistance IABC = 500µA 25 - 15 - - 15 - MΩ
Peak Output Current IABC = 5µA, RL = 0Ω25 - 5 - 3 5 7 µA
IABC = 500µA, RL = 0Ω25 350 500 650 350 500 650 µA
Full 300 - - 300 - - µA
CA3080, CA3080A
3-47
Schematic Diagram
Peak Output
Voltage Positive IABC = 5µA, RL = ∞25 - 13.8 - 12 13.8 - V
Negative 25 - -14.5 - -12 -14.5 - V
Positive IABC = 500µA, RL = ∞25 12 13.5 - 12 13.5 - V
Negative 25 -12 -14.4 - -12 -14.4 - V
Amplifier Supply Current IABC = 500µA 25 0.8 1 1.2 0.8 1 1.2 mA
Device Dissipation IABC = 500µA 252430 36 2430 36mW
Magnitude of Leakage Current IABC = 0, VTP = 0 25 - 0.08 - - 0.08 5 nA
IABC = 0, VTP = 36V 25 - 0.3 - - 0.3 5 nA
Propagation Delay IABC = 500µA 25 - 45 - - 45 - ns
Common-Mode Rejection Ratio IABC = 500µA 25 80 110 - 80 110 - dB
Open-Loop Bandwidth IABC = 500µA 25 - 2 - - 2 - MHz
Slew Rate Uncompensated 25 - 75 - - 75 - V/µs
Compensated 25 - 50 - - 50 - V/µs
Typical Applications
FIGURE 1. SCHEMATIC DIA GRAM OF THE CA3080 AND CA3080A IN A UNITY-GAIN VOLTAGE FOLLOWER CONFIGURATION
AND ASSOCIATED WAVEFORM
Electrical Specifications For Equipment Design, VSUPPLY =±15V, Unless Otherwise Specified (Continued)
PARAMETER TEST CONDITIONS TEMP
CA3080 CA3080A
UNITSMIN TYP MAX MIN TYP MAX
2OUTPUT
V+
AMPLIFIER
BIAS INPUT
NON-
INVERTING
INPUT
INVERTING
INPUT
3
5
4
6
7
V-
Q4D2
Q5
Q6Q7
Q1Q2
Q3
D1
D4
D3
Q8
Q11 D6
Q10
Q9
D3
5
2
4
7
5pF
1MΩ
LOAD
(SCOPE PROBE)
3
6
CA3080, A
51Ω
0.01µF
0.01µF
390pF
300Ω
V- = -15V
0.001µF
62kΩ
V+ = 15V
+
10kΩ
-
10kΩ
VS = ±15V
TIME -0.1µs/DIV.
OUTPUT
1V/DIV.
INPUT
5V/DIV.
CA3080, CA3080A
3-52
FIGURE 13. PROPAGATION DELAY TEST CIRCUIT AND ASSOCIATED WAVEFORMS
Typical Applications
(Continued)
INPUT
OUTPUT
tPLH tPHL
7
2
CA3080,A
+
-
4
5
6
3OUT
IN
51Ω
V- = -15V
1N914
1.2MΩ
IABC = 500µA
56kΩ
V+ = 15V
0
0
-50mV
50mV
Typical Performance Curves
FIGURE 14. INPUT OFFSET V OLTA GE vs AMPLIFIER BIAS
CURRENT FIGURE 15. INPUT OFFSET CURRENT vs AMPLIFIER BIAS
CURRENT
FIGURE 16. INPUT BIAS CURRENT vs AMPLIFIER BIAS CURRENT FIGURE 17. PEAK OUTPUT CURRENT vs AMPLIFIER BIAS
CURRENT
SUPPLY VOLTS: VS = ±15V
70oC
125oC
90oC
-55oC 25oC
70oC
25oC
125oC
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-80.1 1 10 100 1000
INPUT OFFSET VOLTAGE (mV)
AMPLIFIER BIAS CURRENT (µA)
90oC
-55oC
SUPPLY VOLTS: VS = ±15V
-55oC
25oC
125oC
103
0.1 1 10 100 1000
INPUT OFFSET CURRENT (nA)
AMPLIFIER BIAS CURRENT (µA)
102
10
1
0.1
0.01
SUPPLY VOLTS: VS = ±15V
-55oC
25oC
125oC
104
0.1 1 10 100 1000
INPUT BIAS CURRENT (nA)
AMPLIFIER BIAS CURRENT (µA)
103
102
10
1
0.1
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
104
PEAK OUTPUT CURRENT (µA)
103
102
10
1
0.1
SUPPLY VOLTS: VS = ±15V
-55oC
25oC
125oC
LOAD RESISTANCE = 0Ω
CA3080, CA3080A
3-53
FIGURE 18. PEAK OUTPUT V OLTA GE vs AMPLIFIER BIAS
CURRENT FIGURE 19. AMPLIFIER SUPPLY CURRENT vs AMPLIFIER
BIAS CURRENT
FIGURE 20. T O TAL PO WER DISSIPATION vs AMPLIFIER BIAS
CURRENT FIGURE 21. TRANSCONDUCTANCE vs AMPLIFIER BIAS
CURRENT
FIGURE 22. LEAKAGE CURRENT TEST CIRCUIT FIGURE 23. LEAKAGE CURRENT vs TEMPERATURE
Typical Performance Curves
(Continued)
SUPPLY VOLTS: VS = ±15V
TA = 25oC
LOAD RESISTANCE = ∞
15
14.5
14
13.5
13
0
-13
-13.5
-14
-14.5
-15
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
V+OM
V+CMR
V-OM
V-CMR
PEAK OUTPUT VOLTAGE (V)
COMMON MODE INPUT VOLTAGE (V)
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
SUPPLY VOLTS: VS = ±15V
-55oC
25oC
125oC
104
AMPLIFIER SUPPLY CURRENT (µA)
103
102
10
1
0.1
125oC
-55oC, 25oC
TA = 25oC
VS = ±15V
VS = ±6V
VS = ±3V
105
104
103
102
10
1
DEVICE POWER DISSIPATION (µW)
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
SUPPLY VOLTS: VS = ±15V
-55oC
25oC
105
104
103
102
10
1
125oC
FORWARD TRANSCONDUCTANCE (µS)
2
3
4
6
1
CA3080, A
5
7
36V
0V
TEST POINT
(VTP)
+36V
-50 0 25 75 125
TEMPERATURE (oC)
SUPPLY VOLTS: VS = ±15V
100
10
1
0.1
0.01
V2 = V3 = V6 = 36V
0V
-25 50 100
MAGNITUDE OF LEAKAGE CURRENT (nA)
CA3080, CA3080A
3-54
FIGURE 24. DIFFERENTIAL INPUT CURRENT TEST CIRCUIT FIGURE 25. INPUT CURRENT vs INPUT DIFFERENTIAL V OLTA GE
FIGURE 26. INPUT RESISTANCE vs AMPLIFIER BIAS CURRENT FIGURE 27. AMPLIFIER BIAS V OLT AGE vs AMPLIFIER BIAS
CURRENT
FIGURE 28. INPUT AND OUTPUT CAP ACIT ANCE vs AMPLIFIER
BIAS CURRENT FIGURE 29. OUTPUT RESIST ANCE vs AMPLIFIER BIAS
CURRENT
Typical Performance Curves
(Continued)
5
7
V+ = 15V
CA3080, A
2
3
4
6
1
VDIFF = ±4V
V- = -15V
SUPPLY VOLTS: VS = ±15V
25oC
125oC
01234 567
10
1
102
103
104
DIFFERENTIAL INPUT CURRENT (pA)
INPUT DIFFERENTIAL VOLTAGE (V)
SUPPLY VOLTS: VS = ±15V
TA = 25oC
INPUT RESISTANCE (MΩ)
100
10
1
0.1
0.010.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
SUPPLY VOLTS: VS = ±15V
-55oC
25oC
125oC
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
900
800
700
600
500
400
300
200
100
0
AMPLIFIER BIAS VOLTAGE (mV)
SUPPLY VOLTS: VS = ±15V
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
6
5
4
3
2
1
0
7
f = 1 MHz
TA = 25oC
INPUT AND OUTPUT CAPACITANCE (pF)
CI
CO
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (µA)
104
103
102
10
1
105
OUTPUT RESISTANCE (MΩ)
SUPPLY VOLTS: VS = ±15V
TA = 25oC
CA3080, CA3080A
3-55
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rights of third parties which ma y result from its use . No license is g r anted b y implication or otherwise under any patent or patent rights of Harris or its subsidiaries.
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SEMICONDUCTOR
FIGURE 30. INPUT-TO-OUTPUT CAPACITANCE TEST CIRCUIT FIGURE 31. INPUT-TO-OUTPUT CAPACITANCE vs SUPPLY
VOLTAGE
Typical Performance Curves
(Continued)
5
7
V+
2
3
4
V-
CA3080, A
0.01µF
6
0.01µF
f = 1 MHz
TA = 25oC
0.06
0.05
0.04
0.03
0.02
0.01
0 2 4 6 8 1012141618
INPUT - TO - OUTPUT CAPACITANCE (pF)
POSITIVE AND NEGATIVE SUPPLY VOLTAGE (V)
CA3080, CA3080A
