參數(shù)資料
型號(hào)： MCP6271R
廠商： Microchip Technology Inc.
英文描述： 170 レA, 2 MHz Rail-to-Rail Op Amp
中文描述： 170レ甲，2 MHz的軌到軌運(yùn)算放大器
文件頁數(shù)： 16/34頁
文件大?。?/td> 1118K
代理商： MCP6271R
MCP6271/1R/2/3/4/5
DS21810E-page 16
2006 Microchip Technology Inc.
4.9.3
CASCADED OP AMP
APPLICATIONS
The MCP6275 provides the flexibility of Low power
mode for dual op amps in an 8-pin package. The
MCP6275 eliminates the added cost and space in a
battery powered application by using two single op
amps with Chip Select (CS) lines or a 10-pin device
with one CS line for both op amps. Since the two op
amps are internally cascaded, this device cannot be
used in circuits that require active or passive elements
between the two op amps. However, there are several
applications where this op amp configuration with a CS
line becomes suitable. The circuits below show
possible applications for this device.
4.9.3.1
Load Isolation
With the cascaded op amp configuration, op amp B can
be used to isolate the load from op amp A. In
applications where op amp A is driving capacitive or
low resistive loads in the feedback loop (such as an
integrator or filter circuit) the op amp may not have
sufficient source current to drive the load. In this case,
op amp B can be used as a buffer.
FIGURE 4-10:
Buffer.
Isolating the Load with a
4.9.3.2
Cascaded Gain
Figure 4-11
shows a cascaded gain circuit configura-
tion with Chip Select. Op amps A and B are configured
in a non-inverting amplifier configuration. In this
configuration, it is important to note that the input offset
voltage of op amp A is amplified by the gain of op amp
A and B, as shown below:
Therefore, it is recommended that you set most of the
gain with op amp A and use op amp B with relatively
small gain (e.g., a unity gain buffer).
FIGURE 4-11:
Configuration.
Cascaded Gain Circuit
4.9.3.3
Difference Amplifier
Figure 4-12
shows op amp A configured as a difference
amplifier with Chip Select. In this configuration, it is
recommended that well matched resistors (e.g., 0.1%)
be used to increase the Common Mode Rejection Ratio
(CMRR). Op amp B can be used to provide additional
gain and isolate the load from the difference amplifier.
FIGURE 4-12:
Difference Amplifier Circuit.
4.9.3.4
Inverting Integrator with Active
Compensation and Chip Select
Figure 4-13
uses an active compensator (op amp B) to
compensate for the non-ideal op amp characteristics
introduced at higher frequencies. This circuit uses
op amp B as a unity gain buffer to isolate the
integration capacitor C
1
from op amp A and drives the
capacitor with a low impedance source. Since both op
amps are matched very well, they provide a high quality
integrator.
FIGURE 4-13:
Compensation.
Integrator Circuit with Active
A
CS
V
OUTB
MCP6275
B
Load
V
OUT
V
IN
G
A
G
B
V
OSA
G
A
G
B
V
OSB
G
B
+
+
=
Where:
G
A
G
B
=
=
=
=
op amp A gain
op amp B gain
op amp A input offset voltage
op amp B input offset voltage
V
OSA
V
OSB
A
CS
R
4
R
3
R
2
R
1
V
IN
V
OUT
MCP6275
B
A
CS
R
2
R
1
R
4
R
3
V
OUT
MCP6275
V
IN2
B
R
2
R
1
V
IN1
A
CS
R
1
C
1
V
OUT
MCP6275
V
IN
B
相關(guān)PDF資料
PDF描述
MCP6271 300000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
MCP6273 300000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
MCP6274 300,000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
MCP6275 170 UA, 2 MHz Rail-to-Rail Op Amp
MCP6291 1.0 mA, 10 MHz Rail-to-Rail Op Amp
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP6271RT-E/OT 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 2 MHz OP E temp rvs pinout RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
MCP6271T-E/MS 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 2MHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
MCP6271T-E/OT 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 2 MHz OP E temp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
MCP6271T-E/SN 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 2MHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
MCP6272-E/MS 功能描述:運(yùn)算放大器 - 運(yùn)放 Dual 2MHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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