參數(shù)資料
型號(hào)： AD8698ARZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 0K
描述： IC OPAMP GP R-R 1MHZ DUAL 8SOIC
產(chǎn)品變化通告： Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 通用
電路數(shù)： 2
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.4 V/µs
增益帶寬積： 1MHz
電流 - 輸入偏壓： 700pA
電壓 - 輸入偏移： 20µV
電流 - 電源： 2.8mA
電壓 - 電源，單路/雙路(±)： 5 V ~ 30 V，±2.5 V ~ 15 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
AD8698
Rev. 0 | Page 14 of 20
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.
The value of the resistor can be calculated from the following
formula:
mA
5
500
≤
+
S
IN
R
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
VOLTA
GE
(
100mV/D
IV)
VS = ±15V
CL = 68nF
AV = 1
TIME (10
s/DIV)
04807-0-057.
Figure 49. Heavy Capacitive Load Drive without Compensation
VOLTA
GE
(
100mV/D
IV)
VS = ±15V
CL = 68nF
RS = 30
CS = 5nF
AV = 1
TIME (10
s/DIV)
04807-0-061
Figure 50. Compensated Capacitive Load Drive with Snubber
The snubber network consists of a simple RC network
whose values are determined empirically.
V+
RS
CS
CL
V–
400mV
+
–
04807-0-063
Figure 51. Snubber Network
provides a few starting values for optimum
compensation.
Table 5. Compensation Values
CL (nF)
RS (
)
CS (nF)
47
20
7
68
30
5
100
50
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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