FN475 Rev.6.00 Page 1 of 11 Jan 13, 2017 FN475 Rev.6.00 Jan 13, 2017 CA3080, CA3080A 2MHz, Operational Transconductance Amplifier (OTA) DATASHEET 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 have an amplifier bias input which may be used either for gating or for linear gain control. These types also have a high output impedance and their transconductance (g M ) is directly proportional to the amplifier bias current (I ABC ). The CA3080 and CA3080A types are notable for their excellent slew rate (50V/s), 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, multiplexing, etc. Features • Slew Rate (Unity Gain, Compensated) . . . . . . . . . 50V/s • Adjustable Power Consumption . . . . . . . . . . . . 10W to 30W • Flexible Supply Voltage Range . . . . . . . . . . . . 2V to 15V • Fully Adjustable Gain . . . . . . . . . . . . . . . . .0 to g M R L Limit • Tight g M Spread: - CA3080. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2:1 - CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6:1 • Extended g M Linearity . . . . . . . . . . . . . . . . . . . 3 Decades Applications • Sample and Hold • Multiplier • Multiplexer • Comparator • Voltage Follower Pinouts CA3080 (PDIP, SOIC) TOP VIEW Part Number Information PART NUMBER (BRAND) TEMP. RANGE ( o C) 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 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 1 2 3 4 8 7 6 5 + V+ NC INV. INPUT V- NON-INV. INPUT NC OUTPUT AMPLIFIER BIAS INPUT - OBSOLETE PRODUCT NO RECOMMENDED REPLACEMENT contact our Technical Support Center at 1-888-INTERSIL or www.intersil.com/tsc
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Part Number Information - Intersil · PDF file2MHz, Operational Transconductance Amplifier (OTA) ... SCHEMATIC DIAGRAM OF THE CA3080A IN A SAMPLE-HOLD CIRCUIT
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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 have an amplifier bias input which may be used either for 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/s), 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, multiplexing, etc.
Maximum Junction Temperature (Plastic Package) . . . . . . . 150oCMaximum Storage Temperature Range . . . . . . . . . -65oC to 150oCMaximum 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 thedevice 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. JA is measured with the component mounted on an evaluation PC board in free air.
FIGURE 2. 1,000,000/1 SINGLE-CONTROL FUNCTION GENERATOR - 1MHz TO 1Hz
NOTE: A Square-Wave Signal Modulates The External Sweeping Input to Produce 1Hz and 1MHz, showing the 1,000,000/1 frequency range of the function 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 SWEEPING TO 1MHz
FIGURE 3. FUNCTION GENERATOR DYNAMIC CHARACTERISTICS WAVEFORMS
Typical Applications (Continued)
7
4
7
5
4
4
7
6CA3160
3
2
6
8.2k
2
3
2
3
6
5
20pF
VOLTAGE-CONTROLLEDCURRENT SOURCE
+7.5V
CA3080A1k
1k
2M
100k7.5V +7.5V
SYMMETRY
MAX FREQ. SET
EXTERNALSWEEPING INPUT
+7.5V
10k 6.2k 500
-7.5V
MIN FREQ. SET
4.7k
-7.5V
0.9 - 7pFC1
6.2k
10 - 80pFC2
4 - 60pFC3
+
-
BUFFER VOLTAGEFOLLOWER
0.1F
0.1F
-7.5V
+7.5V
2k
10k
CENTERING100k
+7.5V-7.5V+7.5V
430pF
6.8M
CA3080
+
-
30k
-7.5V
10k50k
C515 - 115
C44 - 60
HIGH-FREQ.LEVEL
ADJUST
2-1N914
HIGH-FREQ.SHAPE
THRESHOLDDETECTOR
+
-
FREQ.ADJUST
500
FN475 Rev.6.00 Page 4 of 11Jan 13, 2017
CA3080, CA3080A
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
+
-
2.0k
2.0k
30k
220
0.01F 300pF 3k
OUTPUTINPUT
0.01F
V- = -15V
V+ = +15V
3N138
SAMPLE 0V
HOLD -15V
STORAGE AND PHASECOMPENSATION NETWORK
SLEW RATE (IN SAMPLE MODE) = 1.3V/sACQUISITION TIME = 3s (NOTE)
NOTE: Time required for output to settle within 3mV of a 4V step.
5
2
CA3080A
+
-
7
4
3
6
5
2
CA3140
+
-4
7
6
INPUT 3
1
STROBE
30k
1N914
1N914
2k
+15V
-15V2k
200pF
200pF
400
2k
2k
3.6k
30pF
+15V
-15V2k
100k
0.1F
0.1F
0.1F
0.1F
0.1F
0
-15
SAMPLE
HOLD
SIMULATED LOADNOT REQUIRED
FN475 Rev.6.00 Page 5 of 11Jan 13, 2017
CA3080, CA3080A
Top Trace: Output Signal5V/Div., 2s/Div.
Bottom Trace: Input Signal5V/Div., 2s/Div.
Center Trace: Difference of Input and Output Signals ThroughTektronix Amplifier 7A135mV/Div., 2s/Div.
FIGURE 6. LARGE SIGNAL RESPONSE AND SETTLING TIME FOR CIRCUIT SHOWN IN FIGURE 5
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 AC60Hz
MT2
MT1
5K4W
50K6.2K
2K
2K
150K6.2K
20K
1N914
1N914 RF
100F+
-
G
8
NOTE: All resistors 1/2 watt,unless otherwise specified.
THERMOCOUPLE
FN475 Rev.6.00 Page 6 of 11Jan 13, 2017
CA3080, CA3080A
FIGURE 10. SCHEMATIC DIAGRAM OF THE CA3080A IN A SAMPLE-HOLD CIRCUIT WITH BIMOS OUTPUT AMPLIFIER
Top Trace: Output; 5V/Div., 2s/Div.
Center Trace: Differential Comparison of Input and Output2mV/Div., 2s/Div.
Bottom Trace: Input; 5V/Div., 2s/Div.
Top Trace: Output20mV/Div., 100ns/Div.
Bottom Trace: Input200mV/Div., 100ns/Div.
FIGURE 11. LARGE-SIGNAL RESPONSE FOR CIRCUIT 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
81
INPUT
R1
2K
+7.5V
-7.5V
R22K
C2
R2
15K
0.1F
STROBE
SAMPLECONTROLAMPLIFIER
C1200pF
R3400
STORAGEAND PHASECOMPENSATION
-7.5V
NULLING
R4
2K
SAMPLEREAD-OUTAMPLIFIER
+7.5V
C3
0.1F
C40.1F
C5
156pF R5
2K C60.1F
R72K
OUTPUT CL
e.g. 30pF (TYP)
SAMPLE
HOLD
0V
-7.5
(OTA)
R6100K
0
0
0
0
0
FN475 Rev.6.00 Page 7 of 11Jan 13, 2017
CA3080, CA3080A
FIGURE 13. PROPAGATION DELAY TEST CIRCUIT AND ASSOCIATED WAVEFORMS
Typical 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
51
V- = -15V
1N914
1.2M
IABC = 500A
56k
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
INP
UT
OF
FS
ET
VO
LTA
GE
(m
V)
AMPLIFIER BIAS CURRENT (A)
90oC
-55oC
SUPPLY VOLTS: VS = 15V
-55oC
25oC
125oC
103
0.1 1 10 100 1000
INP
UT
OF
FS
ET
CU
RR
EN
T (
nA
)
AMPLIFIER BIAS CURRENT (A)
102
10
1
0.1
0.01
SUPPLY VOLTS: VS = 15V
-55oC
25oC
125oC
104
0.1 1 10 100 1000
INP
UT
BIA
S C
UR
RE
NT
(n
A)
AMPLIFIER BIAS CURRENT (A)
103
102
10
1
0.10.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (A)
104
PE
AK
OU
TP
UT
CU
RR
EN
T (A
)
103
102
10
1
0.1
SUPPLY VOLTS: VS = 15V
-55oC
25oC
125oCLOAD RESISTANCE = 0
FN475 Rev.6.00 Page 8 of 11Jan 13, 2017
CA3080, CA3080A
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
Typical Performance Curves (Continued)
SUPPLY VOLTS: VS = 15VTA = 25oCLOAD RESISTANCE =
15
14.5
14
13.5
13
0
-13
-13.5
-14
-14.5
-150.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (A)
V+OM
V+CMR
V-OM
V-CMR
PE
AK
OU
TP
UT
VO
LTA
GE
(V
)C
OM
MO
N M
OD
E I
NP
UT
VO
LTA
GE
(V
)
0.1 1 10 100 1000AMPLIFIER BIAS CURRENT (A)
SUPPLY VOLTS: VS = 15V
-55oC
25oC
125oC
104
AM
PL
IFIE
R S
UP
PLY
CU
RR
EN
T (A
)
103
102
10
1
0.1
125oC
-55oC, 25oC
TA = 25oC
VS = 15V
VS = 6V
VS = 3V
105
104
103
102
10
1
DE
VIC
E P
OW
ER
DIS
SIP
AT
ION
(W
)
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (A)
0.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (A)
SUPPLY VOLTS: VS = 15V
-55oC
25oC
105
104
103
102
10
1
125oC
FO
RW
AR
D T
RA
NS
CO
ND
UC
TAN
CE
(S
)
2
3
4
6
1
CA3080, A
5
736V
0V
TEST POINT(VTP)
+36V
-50 0 25 75 125
TEMPERATURE (oC)
SUPPLY VOLTS: VS = 15V100
10
1
0.1
0.01
V2 = V3 = V6 = 36V
0V
-25 50 100
MA
GN
ITU
DE
OF
LE
AK
AG
E C
UR
RE
NT
(n
A)
FN475 Rev.6.00 Page 9 of 11Jan 13, 2017
CA3080, CA3080A
FIGURE 24. DIFFERENTIAL INPUT CURRENT TEST CIRCUIT FIGURE 25. INPUT CURRENT vs INPUT DIFFERENTIAL VOLTAGE
FIGURE 26. INPUT RESISTANCE vs AMPLIFIER BIAS CURRENT 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
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
0 1 2 3 4 5 6 7
10
1
102
103
104
DIF
FE
RE
NT
IAL
IN
PU
T C
UR
RE
NT
(p
A)
INPUT DIFFERENTIAL VOLTAGE (V)
SUPPLY VOLTS: VS = 15VTA = 25oC
INP
UT
RE
SIS
TAN
CE
(M
)
100
10
1
0.1
0.010.1 1 10 100 1000
AMPLIFIER BIAS CURRENT (A)
SUPPLY VOLTS: VS = 15V
-55oC
25oC
125oC
0.1 1 10 100 1000AMPLIFIER BIAS CURRENT (A)
900
800
700
600
500
400
300
200
100
0
AM
PL
IFIE
R B
IAS
VO
LTA
GE
(m
V)
SUPPLY VOLTS: VS = 15V
0.1 1 10 100 1000AMPLIFIER BIAS CURRENT (A)
6
5
4
3
2
1
0
7
f = 1 MHz
TA = 25oC
INP
UT
AN
D O
UT
PU
T C
AP
AC
ITA
NC
E (
pF
)
CI
CO
0.1 1 10 100 1000AMPLIFIER BIAS CURRENT (A)
104
103
102
10
1
105
OU
TP
UT
RE
SIS
TAN
CE
(M
)
SUPPLY VOLTS: VS = 15VTA = 25oC
FN475 Rev.6.00 Page 10 of 11Jan 13, 2017
CA3080, CA3080A
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