1
CA3080, CA3080A
2MHz, Operational Transconductance
Amplifier (OTA)
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. . . . . . . . . . . . .10
W to 30
W
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
CA3080
(METAL CAN)
TOP VIEW
Ordering Information
PART NUMBER
(BRAND)
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
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
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
-
Data Sheet
September 1998
File Number
475.4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Copyright
Intersil Corporation 1999
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 (I
ABC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Output Short Circuit Duration (Note 1). . . . . . . . . . . . . No Limitation
Operating Conditions
Temperature Range
CA3080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to 70
o
C
CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55
o
C to 125
o
C
Thermal Resistance (Typical, Note 2)
JA
(
o
C/W)
JC
(
o
C/W)
PDIP Package . . . . . . . . . . . . . . . . . . .
130
N/A
SOIC Package . . . . . . . . . . . . . . . . . . .
170
N/A
Metal Can Package . . . . . . . . . . . . . . .
200
120
Maximum Junction Temperature (Metal Can) . . . . . . . . . . . . . . 175
o
C
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(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.
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
For Equipment Design, V
SUPPLY
=
15V, Unless Otherwise Specified
PARAMETER
TEST CONDITIONS
TEMP
CA3080
CA3080A
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
Input Offset Voltage
I
ABC
= 5
A
25
-
0.3
-
-
0.3
2
mV
I
ABC
= 500
A
25
-
0.4
5
-
0.4
2
mV
Full
-
-
6
-
-
5
mV
Input Offset Voltage Change
I
ABC
= 500
A to 5
A
25
-
0.2
-
-
0.1
3
mV
Input Offset Voltage Temp. Drift
I
ABC
= 100
A
Full
-
-
-
-
3.0
-
V/
o
C
Input Offset Voltage
Sensitivity
Positive
I
ABC
= 500
A
25
-
-
150
-
-
150
V/V
Negative
25
-
-
150
-
-
150
V/V
Input Offset Current
I
ABC
= 500
A
25
-
0.12
0.6
-
0.12
0.6
Input Bias Current
I
ABC
= 500
A
25
-
2
5
-
2
5
A
Full
-
-
7
-
-
15
A
Differential Input Current
I
ABC
= 0, V
DIFF
= 4V
25
-
0.008
-
-
0.008
5
nA
Amplifier Bias Voltage
I
ABC
= 500
A
25
-
0.71
-
-
0.71
-
V
Input Resistance
I
ABC
= 500
A
25
10
26
-
10
26
-
k
Input Capacitance
I
ABC
= 500
A, f = 1MHz
25
-
3.6
-
-
3.6
-
pF
Input-to-Output Capacitance
I
ABC
= 500
A, f = 1MHz
25
-
0.024
-
-
0.024
-
pF
Common-Mode Input-Voltage
Range
I
ABC
= 500
A
25
12 to
-12
13.6 to
-14.6
-
12 to
-12
13.6 to
-14.6
-
V
Forward Transconductance
(Large Signal)
I
ABC
= 500
A
25
6700
9600
13000
7700
9600
12000
S
Full
5400
-
-
4000
-
-
S
Output Capacitance
I
ABC
= 500
A
,
f = 1MHz
25
-
5.6
-
-
5.6
-
pF
Output Resistance
I
ABC
= 500
A
25
-
15
-
-
15
-
M
Peak Output Current
I
ABC
= 5
A, R
L
= 0
25
-
5
-
3
5
7
A
I
ABC
= 500
A, R
L
= 0
25
350
500
650
350
500
650
A
Full
300
-
-
300
-
-
A
CA3080, CA3080A
3
Schematic Diagram
Peak Output
Voltage
Positive
I
ABC
= 5
A, R
L
=
25
-
13.8
-
12
13.8
-
V
Negative
25
-
-14.5
-
-12
-14.5
-
V
Positive
I
ABC
= 500
A, R
L
=
25
12
13.5
-
12
13.5
-
V
Negative
25
-12
-14.4
-
-12
-14.4
-
V
Amplifier Supply Current
I
ABC
= 500
A
25
0.8
1
1.2
0.8
1
1.2
mA
Device Dissipation
I
ABC
= 500
A
25
24
30
36
24
30
36
mW
Magnitude of Leakage Current
I
ABC
= 0, V
TP
= 0
25
-
0.08
-
-
0.08
5
nA
I
ABC
= 0, V
TP
= 36V
25
-
0.3
-
-
0.3
5
nA
Propagation Delay
I
ABC
= 500
A
25
-
45
-
-
45
-
ns
Common-Mode Rejection Ratio
I
ABC
= 500
A
25
80
110
-
80
110
-
dB
Open-Loop Bandwidth
I
ABC
= 500
A
25
-
2
-
-
2
-
MHz
Slew Rate
Uncompensated
25
-
75
-
-
75
-
V/
s
Compensated
25
-
50
-
-
50
-
V/
s
Typical Applications
FIGURE 1. SCHEMATIC DIAGRAM OF THE CA3080 AND CA3080A IN A UNITY-GAIN VOLTAGE FOLLOWER CONFIGURATION AND
ASSOCIATED WAVEFORM
Electrical Specifications
For Equipment Design, V
SUPPLY
=
15V, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
TEMP
CA3080
CA3080A
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
2
OUTPUT
V+
AMPLIFIER
BIAS INPUT
NON-
INVERTING
INPUT
INVERTING
INPUT
3
5
4
6
7
V-
Q
4
D
2
Q
5
Q
6
Q
7
Q
1
Q
2
Q
3
D
1
D
4
D
3
Q
8
Q
11
D
6
Q
10
Q
9
D
3
5
2
4
7
5pF
1M
LOAD
(SCOPE PROBE)
3
6
CA3080, A
51
0.01
F
0.01
F
390pF
300
V- = -15V
0.001
F
62k
V+ = 15V
+
10k
-
10k
V
S
=
15V
TIME (0.1
s/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 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
6
CA3160
3
2
6
8.2k
2
3
2
3
6
5
20pF
VOLTAGE-CONTROLLED
CURRENT SOURCE
+7.5V
CA3080A
1k
1k
2M
100k
7.5V
+7.5V
SYMMETRY
MAX FREQ. SET
EXTERNAL
SWEEPING INPUT
+7.5V
10k
6.2k
500
-7.5V
MIN FREQ. SET
4.7k
-7.5V
0.9 - 7pF
C
1
6.2k
10 - 80pF
C
2
4 - 60pF
C
3
+
-
BUFFER VOLTAGE
FOLLOWER
0.1
F
0.1
F
-7.5V
+7.5V
2k
10k
CENTERING
100k
+7.5V
-7.5V
+7.5V
430pF
6.8M
CA3080
+
-
30k
-7.5V
10k
50k
C
5
15 - 115
C
4
4 - 60
HIGH-FREQ.
LEVEL
ADJUST
2-1N914
HIGH-
FREQ.
SHAPE
THRESHOLD
DETECTOR
+
-
FREQ.
ADJUST
500
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
+
-
2.0k
2.0k
30k
220
0.01
F
300pF
3k
OUTPUT
INPUT
0.01
F
V- = -15V
V+ = +15V
3N138
SAMPLE 0V
HOLD -15V
STORAGE AND PHASE
COMPENSATION NETWORK
SLEW RATE (IN SAMPLE MODE) = 1.3V/
s
ACQUISITION TIME = 3
s (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
-15V
2k
200pF
200pF
400
2k
2k
3.6k
30pF
+15V
-15V
2k
100k
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
0
-15
SAMPLE
HOLD
SIMULATED LOAD
NOT REQUIRED
CA3080, CA3080A
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