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參數(shù)資料
| 型號： | OPA623AP |
| 英文描述： | Wide Bandwidth, Current-Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，電流反饋運算放大器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 254K |
| 代理商： | OPA623AP |
11
OPA623
reduce the internal thermal rise, resulting in cooler, more
reliable operation. At extreme temperatures and under full
load conditions a heat sink is necessary. The internal power
dissipation is given by the equation P
D
= P
DQ
+ P
DL
, (P
DQ
is the quiescent power dissipation and P
DL
is the power
dissipation in the output stage due to the load). Although the
P
DQ
is very low (40mW at V
CC
=
±
5V), care should be taken
when a signal is applied. For high-speed op amps, a more
precise approach to determine power consumption is to
measure the average total quiescent current for several
typical load conditions. The power consumption of the
OPA623 is influenced by the kind of signal, the applied
signal frequency, the output voltage, load resistor, and the
repetition rate of the signal transitions. Figure 8 shows the
average supply current versus the frequency of an applied
sine wave for various output voltages. Figure 9 illustrates the
average supply current versus the repetition frequency of an
applied square wave signal.
FIGURE 5. Open-Loop Gain vs R
2
|| R
1
.
50
40
30
20
10
0
–10
–20
–30
Frequency (Hz)
O
100k
1M
10M
100M
1G
300
150
27
1M
10M
100M
1G
Frequency (Hz)
G
FREQUENCY RESPONSE vs C
LOAD
G
CL
= +2V/V, V
IN
= 1.4Vp-p
10pF
22pF
47pF
100k
2pF
51
DUT
50
R
2
C
L
R
1
3
2
6
R
1
300
270
240
120
R
2
300
270
240
120
C
L
2pF
10pF
22pF
47pF
FIGURE 7. Frequency Response vs C
LOAD
.
10k
100k
1M
Frequency (Hz)
10M
100M
1G
50
45
40
35
30
25
20
15
10
5
0
A
Q
Sine Curve
R
= 100
G = +2V/V
C
L
= 2pF
5.0Vp-p
2.8Vp-p
1.4Vp-p
0.2Vp-p
FIGURE 8. Average Supply Current vs Frequency
(sinewave).
FIGURE 6. Optimum Frequency Response vs Closed-Loop
Gain.
20
15
10
5
0
–5
–10
–15
–20
–25
–30
G
Frequency (Hz)
100k
1M
10M
100M
1G
+10V/V
+2V/V
+1V/V
–1V/V
25
20
15
10
5
0
A
Q
(
10k
100k
1M
10M
100M
Frequency (Hz)
5.0Vp-p
2.8Vp-p
1.4Vp-p
0.2Vp-p
G = +2V/V
C
L
= 2pF
R
L
= 100
FIGURE 9. Average Supply Current vs Frequency
(squarewave).
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