CA3078E Intersil, CA3078E Datasheet - Page 5

• Manufacturer Part Number: CA3078E
• Description: MICROPOWER OP AMP (OTA) 700 NW
• Manufacturer: Intersil

Specifications of CA3078E

• Rohs Status: RoHS non-compliant
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Slew Rate: 1.5 V/µs
• Gain Bandwidth Product: 2MHz
• Current - Input Bias: 60nA
• Voltage - Input Offset: 1300µV
• Current - Supply: 100µA
• Current - Output / Channel: 12mA
• Voltage - Supply, Single/dual (±): 1.5 V ~ 12 V, ±0.75 V ~ 6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Output Type: -
• -3db Bandwidth: -
• Other names: CA3078

V
Ambient Temperature (T
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 100 A and 20 A, 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
Typical Performance Curves
CA3078 - I
Single Capacitor
Resistor and Capacitor
Input
CA3078A - I
Single Capacitor
Resistor and Capacitor
Input
SUPPLY
FIGURE 6. INPUT OFFSET VOLTAGE vs TOTAL QUIESCENT
COMPENSATION
3.0
2.4
1.8
1.2
0.6
0
TECHNIQUE
1
V
T
R
= 6V, Output Voltage (V
A
S
S
Q
= 25
= 6
Q
= 100 A
10k
= 20 A
CURRENT
o
C
TOTAL QUIESCENT CURRENT
A
) = 25
10
TABLE 1. UNITY GAIN SLEW RATE vs COMPENSATION - CA3078 AND CA3078A
CA3078
CA3078A
o
3.5
k
C
R
14
0
0
5
1
O
) = 5V, Load Resistance (R
750
350
300
100
C
pF
0
0
100
UNITY GAIN (INVERTING)
1
A)
0.644
FIGURE 1
0.25
k
R
2
1000
0.306
0.156
C
L
0
0
0
0
F
2
) = 10k
SLEW RATE
0.0085
0.0095
0.027
Transient Response: 10% overshoot for an output voltage of 100mV,
V/ s
0.04
0.67
0.29
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 100 A and 20 A.
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
configuration is 300mV
FIGURE 7. INPUT OFFSET CURRENT vs TOTAL QUIESCENT
0.01
0.1
10
1
1
V
T
A
S
CA3078
k
5.3
= 25
R
34
= 6
0
0
1
CURRENT
o
C
TOTAL QUIESCENT CURRENT
10
UNITY GAIN (NON-INVERTING)
1500
500
800
125
C
pF
0
0
1
P-P
CA3078A
with a 20k
100
0.311
FIGURE 2
0.77
k
R
2
0.45
load.
1000
0.4
C
0
0
0
0
F
2
A)
SLEW RATE
0.0095
0.024
0.003
10000
V/ s
0.67
0.02
0.4