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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)： | 14/34頁 |
| 文件大?。?/td> | 1118K |
| 代理商： | MCP6271R |
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MCP6271/1R/2/3/4/5
DS21810E-page 14
2006 Microchip Technology Inc.
4.6
Unused Amplifiers
An unused op amp in a quad package (MCP6274)
should be configured as shown in
Figure 4-6
. These
circuits prevent the output from toggling and causing
crosstalk. In Circuit A, R
1
and R
2
produce a voltage
within its output voltage range (V
OH
, V
OL
). The op amp
buffers this voltage, which can be used elsewhere in
the circuit. Circuit B uses the minimum number of
components and operates as a comparator.
FIGURE 4-6:
Unused Op Amps.
4.7
Supply Bypass
With this family of operational amplifiers, the power
supply pin (V
DD
for single supply) should have a local
bypass capacitor (i.e., 0.01 μF to 0.1 μF) within 2 mm
for good, high frequency performance. It also needs a
bulk capacitor (i.e., 1 μF or larger) within 100 mm to
provide large, slow currents. This bulk capacitor can be
shared with nearby analog parts.
4.8
PCB Surface Leakage
In applications where low input bias current is critical,
Printed Circuit Board (PCB) surface leakage effects
need to be considered. Surface leakage is caused by
humidity, dust or other contamination on the board.
Under low humidity conditions, a typical resistance
between nearby traces is 10
12
Ω
. A 5V difference would
cause 5 pA of current to flow. This is greater than the
MCP6271/1R/2/3/4/5 family’s bias current at 25°C
(1 pA, typ.).
The easiest way to reduce surface leakage is to use a
guard ring around sensitive pins (or traces). The guard
ring is biased at the same voltage as the sensitive pin.
An example of this type of layout is illustrated in
Figure 4-7
.
FIGURE 4-7:
for Inverting Gain.
Example Guard Ring Layout
1.
For Inverting Gain and Transimpedance
Amplifiers (convert current to voltage, such as
photo detectors):
a)
Connect the guard ring to the non-inverting
input pin (V
IN
+). This biases the guard ring
to the same reference voltage as the op
amp (e.g., V
DD
/2 or ground).
b)
Connect the inverting pin (V
IN
–) to the input
with a wire that does not touch the PCB
surface.
Non-inverting Gain and Unity Gain Buffer:
a)
Connect the non-inverting pin (V
IN
+) to the
input with a wire that does not touch the
PCB surface.
b)
Connect the guard ring to the inverting input
pin (V
IN
–). This biases the guard ring to the
common mode input voltage.
2.
MCP6274 (A)
V
DD
MCP6274 (B)
R
1
R
2
V
DD
V
DD
Guard Ring
V
SS
V
IN
–
V
IN
+
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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