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| 型号： | AD8698ARM-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运动控制电子 |
| 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 |
| 封装： | MO-187AA, MSOP-8 |
| 文件页数： | 16/20页 |
| 文件大小： | 317K |
| 代理商： | AD8698ARM-REEL |
AD8698
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.
Rev. 0 | Page 16 of 20
V–
V+
V+
R4
10k
V–
0
R2
10k
V
OUT
V
IN
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
Figure 52.
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+
0
R2
22k
R1
11k
C1
1nF
C2
1nF
V
IN
Figure 56. Two Pole High-Pass Filter
V–
V+
0
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8698ARMZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P ±15V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:OP AMP DUAL PRECISION RRO/P 8698 |
| AD8698ARMZ-REEL | 功能描述:IC OPAMP GP R-R 1MHZ DUAL 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| AD8698ARZ | 功能描述:IC OPAMP GP R-R 1MHZ DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| AD8698ARZ-REEL | 功能描述:IC OPAMP GP R-R 1MHZ DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| AD8698ARZ-REEL7 | 功能描述:IC OPAMP GP R-R 1MHZ DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
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