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.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
For Equipment Design
CA3078 LIMITS
CA3078A LIMITS
R
SET
= 5.1MΩ
T
A
= 0
o
C to
70
o
C
MAX
4.5
32
170
-
130
1560
-
-
-
-
-
-
MIN
-
-
-
86
-
-
±5
-5 to
+5
-
6.5
-
-
MAX
5
40
200
-
150
1800
-
-
-
30
-
-
MIN
-
-
-
92
-
-
±5.1
-
80
-
76
76
T
A
= 25
o
C
TYP
0.70
0.50
7
100
20
240
±5.3
-5.5 to
+5.8
115
12
105
105
MAX
3.5
2.5
12
-
25
300
-
-
-
-
-
-
T
A
= -55
o
C to
125
o
C
MIN
-
-
-
90
-
-
±5
-5 to
+5
-
6.5
-
-
MAX
4.5
5.0
50
-
45
540
-
-
-
30
-
-
UNITS
mV
nA
nA
dB
µA
µW
V
V
dB
mA
µV/V
µV/V
TEST CONDITIONS
R
SET
= 1MΩ
T
A
= 25
o
C
MIN
-
-
-
88
-
-
±5.1
-
80
-
76
76
TYP
1.3
6
60
92
100
1200
±5.3
-5.5 to
+5.8
110
12
93
93
PARAMETER
V
IO
I
IO
I
IB
A
OL
I
Q
P
D
V
OM
V
ICR
CMRR
I
OM
+ or I
OM
-
∆V
IO
/∆V+
∆V
IO
/∆V-
V+
and V-
±6V
R
S
(kΩ)
≤10
-
-
-
-
-
-
≤10
≤10
-
≤10
≤10
R
L
(kΩ)
-
-
-
≥10
-
-
≥10
-
-
-
-
-
R
SET
= 13MΩ
V
IO
A
OL
I
Q
P
D
V
OM
CMRR
I
IB
I
IO
±15V
≤10
-
-
-
-
≤10
-
-
-
≥10
-
-
≥10
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
92
-
-
±13.7
80
-
-
1.4
100
20
600
±14.1
106
7
0.50
3.5
-
30
750
-
-
14
2.7
-
88
-
-
±13.5
-
-
-
4.5
-
50
1350
-
-
55
5.5
mV
dB
µA
µW
V
dB
nA
nA
2
CA3078, CA3078A
Electrical Specifications
T
A
= 25
o
C, Typical Values Intended Only for Design Guidance
CA3078
V+ = +1.3V,
V- = -1.3V
R
SET
= 2MΩ
1.3
1.7
9
80
10
26
1.4
-0.8 to +1.1
100
12
20
V+ = +0.75V,
V- = -0.75V
R
SET
= 10MΩ
1.5
0.5
1.3
60
1
1.5
0.3
-0.2 to +0.5
90
0.5
50
V+ = +1.3V,
V- = -1.3V
R
SET
= 2MΩ
0.7
0.3
3.7
84
10
26
1.4
-0.8 to +1.1
100
12
20
CA3078A
V+ = +0.75V,
V- = -0.75V
R
SET
= 10MΩ
0.9
0.054
0.45
65
1
1.5
0.3
-0.2 to +0.5
90
0.5
50
PARAMETER
V
IO
I
IO
I
IB
A
OL
I
Q
P
D
V
OP-P
V
ICR
CMRR
I
OM
±
∆V
IO
/∆V±
UNITS
mV
nA
nA
dB
µA
µW
V
V
dB
mA
µV/V
Electrical Specifications
PARAMETER
∆V
IO
/∆T
A
∆I
IO
/∆T
A
GBWP
SR
T
A
= 25
o
C and V
SUPPLY
=
±
6V, Typical Values Intended Only for Design Guidance
CA3078
CA3078A
R
SET
= 5.1MΩ
5
6.3
0.3
0.027
0.5
3
7.4
1
40
0.25
R
SET
= 1MΩ
6
70
2
0.04
1.5
2.5
1.7
0.8
-
-
UNITS
µV/
o
C
pA/
o
C
MHz
V/µs
V/µs
µs
MΩ
kΩ
nV/√Hz
pA/√Hz
TEST CONDITIONS
R
S
≤10kΩ
R
S
≤10kΩ
A
V
= 100, C
1
= 10pF
See Figures 23, 24
R
SET
= 1MΩ
6
70
2
0.04
1.5
t
R
R
I
R
O
e
N
(10Hz)
i
N
(10Hz)
10% to 90% Rise Time
-
-
R
S
= 0
R
S
= 1MΩ
2.5
0.87
0.8
25
1
3
CA3078, CA3078A
Test Circuits
V+
100kΩ
V+
0V
100kΩ
V
IN
R
2
C
2
3
51kΩ
2
7
100kΩ
V+
7
0V
6
8
1
4
V-
R
1
OPTIONAL
R
2
- C
2
COMP.
R
1
C
1
R
1
OPTIONAL
R
2
- C
2
COMP.
10kΩ
C
L
R
2
V
OUT
0V
V
IN
100kΩ
4
V-
R
1
C
1
C
2
3
2
V+
R
SET
R
SET
-
CA3078
CA3078A
+
5
-
CA3078
CA3078A
+
1
5
0V
6
8
C
L
10kΩ
V
OUT
FIGURE 1. TRANSIENT RESPONSE AND SLEW RATE, UNITY
GAIN (INVERTING) TEST CIRCUIT
NON-INVERTING
V+
INPUT
R
I
3
7
+
CA3078
CA3078A
FIGURE 2. SLEW RATE, UNITY GAIN (NON-INVERTING)
TEST CIRCUIT
INVERTING
R
F
INPUT
V+
7
OUTPUT
6
V+
R
I
2
V+
R
B
1M
V-
2
-
CA3078
CA3078A
OUTPUT
6
-
R
F
4
1M
V-
V-
R
B
3
+
4
V-
R
I
Value of R
B
required to have a
null adjustment range of
±7.5mV
R
I
R
F
V+
R
B
≈
(R
I
+ R
F
) 7.5 x 10
-3
assuming R
B
> >
R
I
R
F
R
I
+ R
F
Value of R
B
required to have a
null adjustment range of
±7.5mV
R
I
V+
R
B
≈
7.5 x 10
-3
assuming R
B
> > R
I
FIGURE 3. OFFSET VOLTAGE NULL CIRCUITS
5.1MΩ
5.1MΩ
10MΩ
7
V
P-P
1µF
510kΩ
2
R
SET
=
30MΩ
5
6
+
V
P-P
1µF
R
L
8
1.5V
“AA” CELL
+
10MΩ
7
2
510kΩ
1µF
3
10MΩ
+
1
4
7pF
8
R
SET
=
30MΩ
5
6
+
5µF
R
L
1.5V
“AA” CELL
+
-
CA3078
CA3078A
-
-
CA3078
CA3078A
-
3
+
1
4
7pF
5µF
10MΩ
FIGURE 4. INVERTING 20dB AMPLIFIER CIRCUIT
FIGURE 5. NON-INVERTING 20dB AMPLIFIER CIRCUIT
4
CA3078, CA3078A
TABLE 1. UNITY GAIN SLEW RATE vs COMPENSATION - CA3078 AND CA3078A
V
SUPPLY
=
±6V,
Output Voltage (V
O
) =
±5V,
Load Resistance (R
L
) = 10kΩ, Transient Response: 10% overshoot for an output voltage of 100mV,
Ambient Temperature (T
A
) = 25
o
C
UNITY GAIN (INVERTING)
FIGURE 1
COMPENSATION
TECHNIQUE
CA3078 - I
Q
= 100µA
Single Capacitor
Resistor and Capacitor
Input
CA3078A - I
Q
= 20µA
Single Capacitor
Resistor and Capacitor
Input
0
14
300
100
0
0
3.5
750
350
0
R
1
kΩ
C
1
pF
R
2
kΩ
C
2
µF
SLEW RATE
V/µs
R
1
kΩ
UNITY GAIN (NON-INVERTING)
FIGURE 2
C
1
pF
R
2
kΩ
C
2
µF
SLEW RATE
V/µs
∞
∞
0.25
0
0
0.306
0.0085
0.04
0.67
0
5.3
1500
500
0
∞
∞
0.311
0
0
0.45
0.0095
0.024
0.67
∞
∞
∞
∞
0.644
0
0
0.156
0.0095
0.027
0.29
0
34
800
125
0
∞
∞
0.77
0
0
0.4
0.003
0.02
0.4
∞
∞
Application Information
Compensation Techniques
The CA3078A and CA3078 can be phase compensated with
one or two external components depending upon the closed
loop gain, power consumption, and speed desired. The
recommended compensation is a resistor in series with a
capacitor connected from Terminal 1 to Terminal 8. Values of
the resistor and capacitor required for compensation as a
function of closed loop gain are shown in Figures 25 and 26.
These curves represent the compensation necessary at
quiescent currents of 100µA and 20µA, respectively, for a
transient response with 10% overshoot. Figures 23 and 24
show the slew rates that can be obtained with the two different
compensation techniques. Higher speeds can be achieved
with input compensation, but this increases noise output.
Compensation can also be accomplished with a single
capacitor connected from Terminal 1 to Terminal 8, with speed
being sacrificed for simplicity. Table 1 gives an indication of
slew rates that can be obtained with various compensation
techniques at quiescent currents of 100µA and 20µA.
Single Supply Operation
The CA3078A and CA3078 can operate from a single supply
with a minimum total supply voltage of 1.5V. Figures 4 and 5
show the CA3078A or CA3078 in inverting and non-inverting
20dB amplifier configurations utilizing a 1.5V type “AA” cell
for a supply. The total consumption for either circuit is
approximately 675nW. The output voltage swing in this
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