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參數(shù)資料
| 型號： | CA3078M |
| 廠商： | INTERSIL CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 2MHz, Micropower Operational Amplifier |
| 中文描述： | OP-AMP, 5000 uV OFFSET-MAX, 2 MHz BAND WIDTH, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | CA3078M |
5
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
μ
A and 20
μ
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
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
μ
A and 20
μ
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
P-P
with a 20k
load.
TABLE 1. UNITY GAIN SLEW RATE vs COMPENSATION - CA3078 AND CA3078A
V
SUPPLY
=
±
6V, Output Voltage (V
O
) =
±
5V, Load Resistance (R
L
) = 10k
,
Transient Response: 10% overshoot for an output voltage of 100mV,
Ambient Temperature (T
A
) = 25
o
C
COMPENSATION
TECHNIQUE
UNITY GAIN (INVERTING)
FIGURE 1
UNITY GAIN (NON-INVERTING)
FIGURE 2
R
1
C
1
R
2
C
2
SLEW RATE
R
1
C
1
R
2
C
2
SLEW RATE
k
pF
k
μ
F
V/
μ
s
k
pF
k
μ
F
V/
μ
s
CA3078 - I
Q
= 100
μ
A
Single Capacitor
0
750
∞
0
0.0085
0
1500
∞
0
0.0095
Resistor and Capacitor
3.5
350
∞
0
0.04
5.3
500
∞
0
0.024
Input
∞
0
0.25
0.306
0.67
∞
0
0.311
0.45
0.67
CA3078A - I
Q
= 20
μ
A
Single Capacitor
0
300
∞
0
0.0095
0
800
∞
0
0.003
Resistor and Capacitor
14
100
∞
0
0.027
34
125
∞
0
0.02
Input
∞
0
0.644
0.156
0.29
∞
0
0.77
0.4
0.4
Typical Performance Curves
FIGURE 6. INPUT OFFSET VOLTAGE vs TOTAL QUIESCENT
CURRENT
FIGURE 7. INPUT OFFSET CURRENT vs TOTAL QUIESCENT
CURRENT
1
10
100
TOTAL QUIESCENT CURRENT
(μ
A)
I
3.0
2.4
1.8
1.2
0.6
0
1000
V
S
=
±
6
T
A
= 25
o
C
R
S
≤
10k
CA3078A
CA3078
CA3078A
CA3078
I
1
10
TOTAL QUIESCENT CURRENT
(μ
A)
1000
0.01
10000
T
A
= 25
o
C
100
0.1
1
10
V
S
=
±
6
CA3078, CA3078A
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