參數(shù)資料
型號： MCP6284
廠商： Microchip Technology Inc.
英文描述： 450 UA, 5 MHz Rail-to-Rail Op Amp
中文描述： 450聯(lián)合航空表示，5兆赫軌到軌運算放大器
文件頁數(shù)： 14/32頁
文件大?。?/td> 580K
代理商： MCP6284
MCP6281/2/3/4/5
DS21811D-page 14
2004 Microchip Technology Inc.
4.8.3
CASCADED OP AMP
APPLICATIONS
The MCP6285 provides the flexibility of Low-power
mode for dual op amps in an 8-pin package. The
MCP6285 eliminates the added cost and space in
battery-powered applications by using two single op
amps with Chip Select lines or a 10-pin device with one
Chip Select 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
Chip Select line becomes suitable. The circuits below
show possible applications for this device.
4.8.3.1
Load Isolation
With the cascaded op amp configuration, op amp B can
be used to isolate the load from op amp A. In applica-
tions where op amp A is driving capacitive or low resis-
tance loads in the feedback loop (such as an integrator
circuit 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 4-9:
Buffer.
Isolating the Load with a
4.8.3.2
Figure 4-10 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:
Cascaded Gain
Therefore, it is recommended to 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 4-10:
Configuration.
Cascaded Gain Circuit
4.8.3.3
Difference Amplifier
Figure 4-11 shows op amp A configured as a difference
amplifier with Chip Select. In this configuration, it is
recommended to use well-matched resistors (e.g.,
0.1%) 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 4-11:
Difference Amplifier Circuit.
A
B
MCP6285
CS
V
OUTB
Load
V
OUT
V
IN
G
A
G
B
V
OSA
G
A
G
B
V
OSB
G
B
+
+
=
Where:
G
A
= op amp A gain
G
B
= op amp B gain
V
OSA
= op amp A input offset voltage
V
OSB
= op amp B input offset voltage
A
B
CS
R
4
R
3
R
2
R
1
V
IN
V
OUT
MCP6285
A
B
CS
R
2
R
1
V
IN2
V
IN1
R
2
R
1
V
OUT
R
4
R
3
MCP6285
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP6284-E/P 功能描述:運算放大器 - 運放 Quad 5MHz 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
MCP6284-E/SL 功能描述:運算放大器 - 運放 Quad 5MHz 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
MCP6284-E/ST 功能描述:運算放大器 - 運放 Quad 5MHz 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
MCP6284ESL 制造商:Microchip Technology Inc 功能描述:
MCP6284T-E/SL 功能描述:運算放大器 - 運放 Quad 5MHz 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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