1
®CA3080, CA3080A
2MHz, Operational Transconductance
Amplifier (OTA)
The CA3080 and CA3080A types are Gatable- G ain Blocks
which utili ze the unique operational-transconduct ance-
amplifier (OTA) concept described in Application Note
AN6668, “Applications of the CA3080 and CA3080A Hi gh-
Performance Operational Transconductance Amplifiers”.
The CA3080 and CA3080A types have dif ferential input and a
single-ended, push-pull, cl ass A output. In addition, these types
have an amplifier bias input which may be used either for gating
or for li near gain control. These types also have a high output
impedance and their transconductance (gM) is directl y
proportional to the amplifier bi as current (IABC).
The CA3080 and CA3080A types are not able f or their excell ent
slew rate (50V/µs), which makes them especial ly useful for
multiplexer and fast unity- gain voltage followers. These types
are especially appli cable f or mult iplexer applic ations because
power is consumed only when the devices ar e in the “ON”
channel state.
The CA3080A’s characteristics are specifi call y contro ll ed for
appli cati ons such as s ample -hold, gain-c ontrol , mult iplex ing,
etc.
Features
• Slew Rate (Unity Gain, Compensated) . . . . . . . . . 50V/µs
• Adjustable Power Consumption . . . . . . . . . . . .10µW to 30µW
• Fle xibl e Supply Vo ltage Range . . . . . . . . . . . . ±2V to ±15V
• Fully Adjustable Gain. . . . . . . . . . . . . . . . .0 to gMRL Limit
•Tight g
M Spread:
- CA3080. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2:1
- CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6:1
• Extended gM Linearity . . . . . . . . . . . . . . . . . . . 3 Decades
Applications
• Sample and Hold • Multiplier
• Multiplexer • Comparator
• Volt age Follower
Pinouts
CA3080
(PDIP, SOIC)
TOP VIEW
Ordering Information
PART NUMBER
(BRAND) TEMP.
RANGE (oC) PACKAGE PKG.
NO.
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
CA 3080 E 0 to 70 8 Ld PDI P E8 .3
CA3080M
(3080) 0 t o 70 8 Ld SOIC M 8.1 5
CA3080M96
(3080) 0 t o 70 8 Ld SOIC Tape
and Reel M8.15
1
2
3
4
8
7
6
5
+
V+
NC
INV.
INPUT
V-
NON-INV.
INPUT
NC
OUTPUT
AMPLIFIER
BIAS INPUT
-
D a t a S h e et April 2001 File N umbe r 475. 5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1- 888-INTER SIL o r 321-724-7143 |Intersil (and design) is a register ed trademark o f Intersil Am ericas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
2
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
Ope rat i ng Condi tio ns
Te mp erature R an ge
CA3080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 1 2 5oC
Thermal Resistance (Typical, Note 2) θJA (oC/W) θJC (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . 130 N/A
SOIC Package . . . . . . . . . . . . . . . . . . . 170 N/A
Max imum Ju nctio n Te mp er atu re (Pla s tic Pac kage ) . . . . . . . 15 0oC
Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
CAUTIO N: S tresses abov e those l isted i n “ A bsolute Max imum Ra ting s” ma y cause per manen t dam age to th e de vice. This is a s tress on l y rating and ope ration of th e
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 me asured with the component mou nted on an eval uation PC boa rd in free air.
Electrical Speci fications For Eq uipment Design, VSUPPLY = ±15V, Un less Otherwise Specified
PARAMETER TEST CONDITIONS TEMP
CA3080 CA3080A
UNITSMIN TYP MAX MIN TYP MAX
Inp ut Offs et Volta ge IABC = 5µA25-0.3--0.32mV
IABC = 500µA25-0.45-0.42mV
Full - - 6 - - 5 mV
Input Offset Voltage Change IABC = 500µA to 5µA25-0.2- -0.13mV
Input Offset Voltage Temp. Drift IABC = 100µA Full - - - - 3.0 - µV/oC
Inp ut Offs et Volta ge
Sensitivity Positive IABC = 500µA 25 - - 150 - - 150 µV/V
Negative 25 - - 150 - - 150 µV/V
Inp ut O ffset Curr en t IABC = 500µA 25 - 0.12 0.6 - 0.12 0.6 µΑ
Input Bias Current IABC = 500µA25-25-25µA
Full-- 7 --15µA
Di ffe ren ti al In pu t Curren t 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 25 10 26 - 10 26 - 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 Inp ut-Volta ge
Range IABC = 500µA2512 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 = 500µA25-15--15-MΩ
Peak Output Cur rent IABC = 5µA, R L = 0Ω25 - 5 - 3 5 7 µA
IABC = 500µA, RL = 0Ω25 350 500 650 350 500 650 µA
Full 300 - - 300 - - µA
CA3080, CA3080A
3
Sche matic 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 25243036243036mW
Magnitude of Leakage Current IABC = 0, VTP = 0 25 - 0.08 - - 0.08 5 nA
IABC = 0, VTP = 36V 25-0.3- -0.35nA
Propagation Delay IABC = 50 0 µA25-45--45-ns
Common-Mode Rejection Ratio IABC = 500µA 2580110-80110-dB
Open-Loop B andwi dth IABC = 500µA25-2--2-MHz
Slew Rate Uncompensated 25 - 75 - - 75 - V/µs
Compensated 25 - 50 - - 50 - V/µs
Typical Applications
FIGURE 1. SCHEMATIC DIAGRAM OF THE CA3080 AND CA3080A IN A UNITY-GAIN VOLTAGE FOLLOWER CONFIGURATION AND
ASSOCIATED WAVEFORM
Electrical Speci fications For Eq uipment Design, VSUPPLY = ±15V, Un less 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
4
FIGURE 2. 1,000,000/1 SINGLE-CONTROL FUNCTION GENERATOR - 1MHz TO 1Hz
NOTE: A Square -Wave Signal Modulat es The E xternal Sweeping
Input to Produce 1Hz and 1MHz, showing the 1,000,000/1 frequency
range of the fun c tion generator.
NOTE: The bottom trace is the sweeping signal and the top trace is
the actual generator output. The center trace displays the 1MHz signal
via delayed oscilloscope triggering of the upper swept output signal.
FIGURE 3A. TWO-TONE OUTPUT SIGNAL FROM THE
FUNCTION GENERATOR FIGURE 3B. TRIPLE-TRACE OF THE FUNCTION GENERATOR
SWE EPING TO 1MH z
FIGURE 3. FUNCTION GENERATOR DYNAMIC CHARACTERISTICS WAVEFORMS
Typical Applications (Continued)
7
4
7
54
4
7
6
CA3160
3
2
6
8.2kΩ
2
3
2
3
6
5
20pF
VOLTAGE-CONTROLLED
CURRENT SOURCE
+7.5V
CA3080A
1kΩ
1kΩ
2MΩ
100kΩ
7.5V +7.5V
SYMMETRY
MAX FRE Q. SET
EXTERNAL
SWEEPING INPUT
+7.5V 10kΩ6.2kΩ500Ω
-7.5V
MIN FREQ. SET
4.7kΩ
-7.5V
0.9 - 7pF
C1
6.2kΩ
10 - 80pF
C2
4 - 60pF
C3
+
-
BUFFER VOLTAGE
FOLLOWER
0.1µF
0.1
µF
-7.5V
+7.5V
2kΩ
10kΩ
CENTERING
100kΩ
+7.5V-7.5V +7.5V
430pF 6.8MΩ
CA3080
+
-
30kΩ
-7.5V
10kΩ
50kΩ
C5
15 - 115
C4
4 - 60
HIGH-FREQ.
LEVEL
ADJUST
2-1N914
HIGH-
FREQ.
SHAPE
THRESHOLD
DETECTOR
+
-
FREQ.
ADJUST
500Ω
CA3080, CA3080A
5
FIGURE 4. SCHEMATIC DIAGRAM OF THE CA3080A IN A SAMPLE-HOLD CONFIGURATION
FIGURE 5. SAMPLE AND HOLD CIRCUIT
Typical Applications (Continued)
7
4
2
6
5
3
CA3080A
+
-
2.0kΩ
2.0kΩ
30kΩ
220Ω
0.01µF 300pF 3kΩ
OUTPUTINPUT
0.01µF
V- = -15V
V+ = +15V
3N138
SAMPLE 0V
HOLD -15V
STORAGE AND PHASE
COMPENSATION NETWORK
SLEW RATE (IN SAMPLE MODE) = 1.3V/µs
ACQUISITION TIME = 3µs(NOTE)
NOTE: Time required for output to settl e within ±3 mV of a 4V st ep .
5
2
CA3080A
+
-
7
4
3
6
5
2
CA3140
+
-
4
7
6
INPUT 3
1
STROBE
30kΩ
1N914
1N914
2kΩ
+15V
-15V
2kΩ
200pF 200pF
400Ω
2kΩ
2kΩ
3.6kΩ
30pF
+15V
-15V
2kΩ
100kΩ
0.1µF
0.1
µF
0.1µF
0.1µF
0.1µF
0
-15
SAMPLE
HOLD
SIMULATED LOAD
NOT REQUIRED
CA3080, CA3080A
6
Top Trace: Output Signal
5V /Div ., 2µs/Div.
Bottom Trace: Input Signal
5V /Div ., 2µs/Div.
Cente r Trace: Differen ce of Inp ut and Output Signals Through
Tektronix Amplifier 7A13
5mV/Div., 2µs/Div.
FIGURE 6. LARGE SIGNAL RESPONSE AND SETTLING TIME FOR CIRCUIT SHOWN IN FIGURE 5
Top Trace: System Output; 100mV/Div., 500ns/Div.
Bottom Trace: Sampling Signal; 20V/Div., 500ns/Div. Top Trace: Output; 50mV /Div., 2 00ns/Div.
Bottom Trace: Input; 50mV/Div., 200ns/Div.
FIGURE 7. SAMPLING RESPONSE FOR CIRCUIT SHOWN IN
FIGURE 5 FIGURE 8. INPUT AND OUTPUT RESPONSE FOR CIRCUIT
SHOWN IN FIGURE 5
FIGURE 9. THERMOCOUPLE TEMPERATURE CONTROL WITH CA3079 ZERO VOLTAGE SWITCH AS THE OUTPUT AMPLIFIER
Typical Applications (Continued)
10
2
7
3
CA3080A
+
-
4
6
5
13
2
6
CA3079
8
4
5
7
911
LOAD
120V AC
60Hz
MT2
MT1
5K
4W
50K
6.2K
2K
2K
150K
6.2K
20K
1N914
1N914 RF
100µF
+
-
G
8
NOTE: All r esistors 1/2 watt,
unless otherwise spec ified.
THERMOCOUPLE
CA3080, CA3080A
7
FIGURE 10. SCHEMATIC DIAGRAM OF THE CA3080A IN A SAMPLE-HOLD CIRCUIT WITH BIMOS OUTPUT AMPLIFIER
Top Trace: Output; 5V/Div., 2µs/Div.
Center Trace: Differen tial Comparis on of I nput and Outpu t
2mV/Div., 2µs/Div.
Bottom Trace: Input; 5V/Div., 2µs/Div.
Top Trace: Output
20mV/Div., 100ns/Div.
Bottom Trace: Input
200mV/D iv ., 10 0n s/ D iv .
FIGURE 1 1. LARGE-SIGNAL RE SPONSE FOR CI RCUIT
SHOWN IN FIGURE 10 FIGURE 12. SMALL-SIGNAL RESPONSE FOR CIRCUIT
SHOWN IN FIGURE 10
Typical Applications (Continued)
5
2
CA3080A
+
-
7
4
3
6
5
2
CA3130
+
-
4
7
6
3
8
1
INPUT
R1
2K
+7.5V
-7.5V
R2
2K
C2
R2
15K
0.1µF
STROBE
SAMPLE
CONTROL
AMPLIFIER
C1
200pF
R3
400
STORAGE
AND PHASE
COMPENSATION
-7.5V
NULLING
R4
2K
SAMPLE
READ-OUT
AMPLIFIER
+7.5V
C3
0.1µF
C4
0.1
µF
C5
156
pF R5
2K C6
0.1µF
R7
2K
OUTPUT CL
e.g. 30pF (TYP)
SAMPLE
HOLD
0V
-7.5
(OTA)
R6
100K
0
0
0
0
0
CA3080, CA3080A
8
FIGURE 13. PROPAGATION DELAY TEST CIRCUIT AND ASSOCIATED WAVEFORMS
Typica l Performance Curves
FIGURE 14. INPUT OFFSET VOLTAGE 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
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
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
9
FIGURE 18. PEAK OUTPUT VOLTAGE vs AMPLIFIER BIAS
CURRENT FIGURE 19. AMPLIFIER SUPPLY CURRENT vs AMPLIFIER
BIAS CURRENT
FIGURE 20. TOTAL POWER DISSIPATION vs AMPLIFIER BIAS
CURRENT FIGURE 21. TRANSCONDUCTANCE vs AMPLIFIER BIAS
CURRENT
FIGURE 22. LEAKAGE CURRENT TEST CIRCUIT FIGURE 23. LEAKAGE CURRENT vs TEMPERATURE
Typica l 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)
SUP PL Y VOLT S : 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
10
FIGURE 24. DIFFERENTIAL INPUT CURRENT TEST CIRCUIT FIGURE 25. INPUT CURRENT vs INPUT DIFFER E NTIAL VOLT-
AGE
FIGURE 26. INPUT RE SIST ANCE vs AMPL IFI ER BIA S CURR ENT FIGURE 27. AMPLIFIER BIAS VOLTAGE vs AMPLIFIER BIAS
CURRENT
FIGURE 28. INPUT AND OUTPUT CAPACITANCE vs AMPLI-
FIER BIAS CURRENT FIGURE 29. OUTPUT RESISTANCE vs AMPLIFIER BIAS
CURRENT
Typica l Performance Curves (Continued)
5
7
V+ = 15V
CA3080, A
2
3
4
6
1
VDIFF = ±4V
V- = -15V
SUP PL Y VOLT S : 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
11
FIGURE 30. INPUT-TO-OUTPUT CAPACITANCE TEST CIRCUIT FIGURE 31. INPUT-TO-OUTPUT CAPACI TANCE vs SUPPLY
VOLTAGE
Typica l 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
02 4 6 8 1012141618
INPUT - TO - OUTPUT CAPACITANCE (pF)
POSITIVE AND NEGATIVE SUPPLY VOLTAGE (V)
CA3080, CA3080A
