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參數資料
| 型號： | AD8698AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual Precision, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 300 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 14/20頁 |
| 文件大小： | 317K |
| 代理商： | AD8698AR |
AD8698
APPLICATIONS
INPUT OVERVOLTAGE PROTECTION
The AD8698 has internal protective circuitry which allows
voltages at either input to exceed the supply voltage. However,
if voltages applied at either input exceed the supply voltage by
more than 2 V, it is recommended to use a resistor in series
with the inputs to limit the input current and prevent damaging
the device.
Rev. 0 | Page 14 of 20
The value of the resistor can be calculated from the following
formula:
S
IN
R
mA
5
500
≤
+
S
V
V
DRIVING CAPACITIVE LOADS
The AD8698 is stable even when driving heavy capacitive
loads in any configuration. Although the AD8698 will safely
drive capacitive loads well over 10 nF, it is recommended to
use external compensation should the amplifier be subjected
to driving a load exceeding 50 nF. This is particularly
important in positive unity gain configurations, the worst
case for stability.
Figure
49 shows the output of the AD8698
with a 68 nF load in response to a 400 mV signal at its
positive input; the overshoot is less than 25% without any
external compensation. Using a simple “snubber” network
reduces the overshoot to less than 10% as shown in
Figure
50.
V
V
S
= ±15V
C
L
= 68nF
A
V
= 1
TIME (10
μ
s/DIV)
0
Figure 49. Heavy Capacitive Load Drive without Compensation
V
V
S
= ±15V
C
L
= 68nF
R
S
= 30
C
S
= 5nF
A
V
= 1
TIME (10
μ
s/DIV)
0
Figure 50. Compensated Capacitive Load Drive with Snubber
The snubber network consists of a simple RC network
whose values are determined empirically.
V+
R
S
C
S
C
L
V–
400mV
+
–
0
Figure 51. Snubber Network
Table 5
provides a few starting values for optimum
compensation.
Table 5. Compensation Values
C
L
(nF)
R
S
(
)
47
20
68
30
100
50
C
S
(nF)
7
5
3
The use of the snubber network does not recover the loss of
bandwidth incurred by the load capacitance. The AD8698
maintains a unity gain bandwidth of 1 MHz with load
capacitances of up to 1 nF.
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| AD8698ARMZ-REEL | 功能描述:IC OPAMP GP R-R 1MHZ DUAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數:4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
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