参数资料
| 型号： | OP270FZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 5MHZ DUAL PREC 8CDIP |
| 标准包装： | 48 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 转换速率： | 2.4 V/µs |
| 增益带宽积： | 5MHz |
| 电流 - 输入偏压： | 10nA |
| 电压 - 输入偏移： | 20µV |
| 电流 - 电源： | 4mA |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-CERDIP |
| 包装： | 管件 |
| 产品目录页面： | 772 (CN2011-ZH PDF) |
OP270
Rev. E | Page 15 of 20
CAPACITIVE LOAD DRIVING AND POWER SUPPLY
CONSIDERATIONS
The OP270 is unity-gain stable and capable of driving large
capacitive loads without oscillating. Nonetheless, good supply
bypassing is highly recommended. Proper supply bypassing
reduces problems caused by supply line noise and improves the
capacitive load driving capability of the OP270.
In the standard feedback amplifier, the output resistance of the
op amp combines with the load capacitance to form a low-pass
filter that adds phase shift in the feedback network and reduces
stability. A simple circuit to eliminate this effect is shown in
Figure 39. The components C1 and R3 decouple the amplifier
from the load capacitance and provide additional stability. The
values of C1 and R3 shown in Figure 39 are for a load capacitance
of up to 1000 pF when used with the OP270.
00
32
5-
04
0
C1
200pF
VIN
VOUT
PLACE SUPPLY DECOUPLING
CAPACITOR AT OP270
OP270
V+
R1
C3
0.1F
C2
10F
C1
1000pF
R2
C4
10F
C5
0.1F
R3
50
+
V–
+
Figure 39. Driving Large Capacitive Loads
UNITY-GAIN BUFFER APPLICATIONS
When Rf ≤ 100 Ω and the input is driven with a fast, large signal
pulse (>1 V), the output waveform looks like the one in Figure 40.
During the fast feedthrough-like portion of the output, the input
protection diodes effectively short the output to the input, and
a current, limited only by the output short-circuit protection, is
drawn by the signal generator. With Rf ≥ 500 Ω, the output is
capable of handling the current requirements (IL ≤ 20 mA at 10 V);
the amplifier stays in its active mode and a smooth transition occurs.
When Rf > 3 kΩ, a pole created by Rf and the input capacitance
(3 pF) of the amplifier creates additional phase shift and reduces
phase margin. A small capacitor (20 pF to 50 pF) in parallel with
Rf helps eliminate this problem.
0
032
5-
0
41
OP270
2.4V/s
Rf
Figure 40. Pulsed Operation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OP-270FZ | 制造商:AD 制造商全称:Analog Devices 功能描述:DUAL VERY LOW NOISE PRECISION OPERATIONAL AMPLIFIER |
| OP-270G | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers |
| OP270GBC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
| OP270GN8 | 功能描述:IC PREC OPAMP LO NOIS DUAL 8DIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| OP-270GN8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers |
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