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參數資料
| 型號： | AD8512ARMZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 1800 uV OFFSET-MAX, 8 MHz BAND WIDTH, PDSO8 |
| 封裝： | ROHS COMPLIANT, MO-187AA, MSOP-8 |
| 文件頁數： | 15/20頁 |
| 文件大小： | 497K |
| 代理商： | AD8512ARMZ-REEL |
AD8510/AD8512/AD8513
Rev. E | Page 15 of 20
TIME (1
μ
s/DIV)
V
V
SY
= ±15V
C
L
= 500pF
R
L
=10k
0
Figure 46. Capacitive Load Drive without Snubber
When the snubber circuit is used, the overshoot is reduced from
55% to less than 3% with the same load capacitance. Ringing is
virtually eliminated, as shown in Figure 47.
TIME (1
μ
s/DIV)
V
V
SY
= ±15V
R
L
=10k
C
L
= 500pF
R
S
=100
C
S
=1nF
0
Figure 47. Capacitive Load with Snubber Network
Optimum values for R
S
and C
S
depend on the load capacitance
and input stray capacitance and are determined empirically.
Table 5 shows a few values that can be used as starting points.
Table 5. Optimum Values for Capacitive Loads
C
LOAD
R
S
()
500 pF
100
2 nF
70
5 nF
60
C
S
1 nF
100 pF
300 pF
OPEN-LOOP GAIN AND PHASE RESPONSE
In addition to their impressive low noise, low offset voltage, and
offset current, the AD8510/AD8512/AD8513 have excellent
loop gain and phase response even when driving large resistive
and capacitive loads. They were compared to the OPA2132
under the same conditions. With a 2.5 k load at the output, the
AD8510/AD8512/AD8513 have more than 8 MHz of band-
width and a phase margin of more than 52°.
The OPA2132, on the other hand, has only 4.5 MHz of band-
width and 28° of phase margin under the same test conditions.
Even with a 1 nF capacitive load in parallel with the 2 k load
at the output, the AD8510/AD8512/AD8513 show much better
response than the OPA2132, whose phase margin is degraded to
less than 0, indicating oscillation.
FREQUENCY (Hz)
G
10k
–30
–20
–10
100k
0
10
30
1M
10M
50M
40
50
20
60
70
–135
–90
–45
0
45
90
135
190
225
270
315
P
V
SY
= ±15
V
R
L
= 2.5k
C
L
= 0
0
Figure 48. Frequency Response of the AD8510/AD8512/AD8513
FREQUENCY (Hz)
G
10k
–30
–20
–10
100k
0
10
30
1M
10M
50M
40
50
20
60
70
–135
–90
–45
0
45
90
135
190
225
270
315
P
V
SY
= ±15
V
R
L
= 2.5k
C
L
= 0
0
Figure 49. Frequency Response of the OPA2132
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