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參數資料
| 型號： | AD8698ARM-R2 |
| 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： | MO-187AA, MSOP-8 |
| 文件頁數： | 15/20頁 |
| 文件大?。?/td> | 317K |
| 代理商： | AD8698ARM-R2 |
AD8698
Rev. 0 | Page 15 of 20
U
1k
10k
100k
1M
10M
LOAD CAPACITANCE (nF)
1
10
100
0
Figure 52. Unity Gain Bandwidth vs. Load Capacitance
Figure 52 shows the unity gain bandwidth as a function of load
capacitance.
INSTRUMENTATION AMPLIFIER
Instrumentation amplifiers are used in applications requiring
precision, accuracy, and high CMRR. One popular application
is signal conditioning in process control, test automation, and
measurement instrumentation, where the amplifier is used to
amplify small signals.
The triple op amp implementation uses the AD8698 at the
front end with the OP184 for optimum accuracy.
The circuit in Figure 53
enjoys a high overall gain, excellent dc
performance, high CMRR, as well as the benefit of an output
that swings to the supplies.
The CMRR of the in-amp will be limited by the choice of
resistor tolerance. R5 is an optional potentiometer that can be
used to calibrate the circuit for maximum gain. R7 can be
trimmed for optimum CMRR.
The output voltage is given by:
1
=
1
R
2
R
4
R
3
R
V
V
IN
O
2
V–
V+
V+
R3
9k
R1
1k
R2
10k
R1
9.8k
R7
400
R4
2k
R5
10k
R3
9k
V–
V2
V1
0
V–
V+
OP184
1/2 AD8698
1/2 AD8698
Figure 53. Three Op Amp In-Amp
COMPOSITE AMPLIFIER
The dc accuracy of the AD8698 and the ac performance of the
OP184 are combined in the circuit shown in Figure 54. The
composite amplifier provides a higher bandwidth, a lower offset
voltage, and a higher loop, thereby reducing the gain error
substantially.
The circuit shown exhibits a total output rms noise of less than
500 μV, corresponding to less than 3 mV of peak-to-peak noise
over approximately a 3 MHz bandwidth. Cf is used to minimize
peaking.
The circuit has an inverting gain of 10. In applications with
higher closed-loop gains, Cf is necessary to maintain a
sufficient phase margin and ensure stability. This results in a
narrower closed-loop bandwidth.
V+
OP184
1/2 AD8698
V–
V+
V–
0
R2
10k
R1
1k
Cf
20pF
V
IN
Figure 54. Composite Amplifier Circuit
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8698ARM-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P ±15V 8-Pin MSOP T/R |
| 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 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) |
| AD8698ARZ | 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:1 輸出類型:滿擺幅 轉換速率: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) |
| AD8698ARZ-REEL | 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:1 輸出類型:滿擺幅 轉換速率: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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