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| 型號： | AD8698ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/20頁 |
| 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 |
| 標準包裝： | 2,500 |
| 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） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
AD8698
Rev. 0 | Page 16 of 20
LOW NOISE APPLICATIONS
In some applications, it is critical to minimize the noise, and
although the AD8698 has a low noise of typically 8 nV/√Hz at
1 kHz, paralleling the two amplifiers within the same package
reduces the total noise referred to the input to approximately
5.5 nV/√Hz. This simple technique is depicted in Figure 55.
V–
V+
R4
10k
V–
04807-0-066
R2
10k
VOUT
VIN
R3
1k
R1
1k
R5
100
R3
100
Figure 55. Paralleling Amplifiers
DRIVING ADCs
The AD8698 can drive extremely heavy capacitive loads
without any compensation. Sometimes capacitors are placed at
the output of the amplifier to absorb transient currents while
the op amp is interfaced with the ADC. Most op amps need a
small resistor with the output to isolate the load capacitance.
This results in a loss of bandwidth and slows the amplifier
down substantially. However, the AD8698 maintains a unity
gain bandwidth of 1 MHz with loads of up to 1 nF, as shown in
USING THE AD8698 IN ACTIVE FILTER DESIGNS
The AD8698 is recommended for unity gain filter designs with
a corner frequency of up to 100 kHz, one tenth of the op amp’s
unity gain bandwidth.
If a higher gain is desired, the corner frequency should be
chosen accordingly. For example, if the amplifier is configured
with a gain of 10, the corner frequency of the filter should not
be more than 10 kHz.
An example of an active filter is the Sallen Key. This topology
gives the user the flexibility of implementing a low-pass or a
high-pass filter by simply interchanging the resistors and the
capacitors.
In the high-pass filter of Figure 56, the damping factor Q is set
to 1/√2 for a maximally flat response (Butterworth).
The gain is unity and the bandwidth is 10 kHz with the values
shown.
V–
V+
04807-0-067
R2
22k
R1
11k
C1
1nF
C2
1nF
VIN
Figure 56. Two Pole High-Pass Filter
V–
V+
04807-0-068
R2
11k
R1
11k
C1
2nF
C2
1nF
VIN
Figure 57. Two Pole Low-Pass Filter
The circuit of Figure 57 has a bandwidth of 10 kHz and a
maximally flat response. In this case, the damping factor is
controlled by the ratio of the capacitors and the gain is unity.
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| AD8698ARZ-REEL7 | 功能描述:IC OPAMP GP R-R 1MHZ DUAL 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 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） 供應商設備封裝:8-SO 包裝:帶卷 (TR) |
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