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| 型号： | MCP6031DM-PTPLS |
| 厂商： | Microchip Technology |
| 文件页数： | 9/34页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO MCP6031 PHOTODIODE |
| 标准包装： | 1 |
| 系列： | PICtail™ Plus |
| 主要目的： | 接口，传感器至模数转换器接口，光电检测器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP6031 |
| 主要属性： | 光电流至电压转换 |
| 次要属性： | RC 低通滤波器 |
| 已供物品： | 板，CD |
| 产品目录页面： | 681 (CN2011-ZH PDF) |
| 相关产品： | MCP6031T-E/OTDKR-ND - IC OPAMP SNGL 1.8V SOT23-5 MCP6031T-E/OTCT-ND - IC OPAMP SNGL 1.8V SOT23-5 MCP6031T-E/MCTR-ND - IC OPAMP SNGL 1.8V 8DFN MCP6031-E/MC-ND - IC OPAMP SNGL 1.8V 8DFN MCP6031-E/MS-ND - IC OPAMP SNGL 1.8V 8MSOP MCP6031-E/SN-ND - IC OPAMP SNGL 1.8V 8SOIC MCP6031T-E/MSTR-ND - IC OPAMP SNGL 1.8V 8MSOP MCP6031T-E/SNTR-ND - IC OPAMP SNGL 1.8V 8SOIC MCP6031T-E/OTTR-ND - IC OPAMP SNGL 1.8V SOT23-5 |
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2008 Microchip Technology Inc.
DS22041B-page 17
MCP6031/2/3/4
4.9
Application Circuits
4.9.1
BATTERY CURRENT SENSING
The MCP6031/2/3/4 op amps’ Common Mode Input
Range, which goes 0.3V beyond both supply rails,
supports their use in high side and low side battery
current sensing applications. The ultra low quiescent
current (0.9 A, typical) helps prolong battery life, and
the rail-to-rail output supports detection of low currents.
Figure 4-7 shows a high side battery current sensor
circuit. The 10
Ω resistor is sized to minimize power
losses. The battery current (IDD) through the 10Ω
resistor causes its top terminal to be more negative
than the bottom terminal. This keeps the common
mode input voltage of the op amp below VDD, which is
within its allowed range. The output of the op amp will
also be below VDD, which is within its Maximum Output
Voltage Swing specification.
FIGURE 4-7:
High Side Battery Current
Sensor.
4.9.2
PRECISION COMPARATOR
Use high gain before a comparator to improve the lat-
ter’s input offset performance. Figure 4-8 shows a gain
of 11 V/V placed before a comparator. The reference
voltage VREF can be any value between the supply
rails.
FIGURE 4-8:
Precision, Non-inverting
Comparator.
4.9.3
DRIVING MCP3421
ΔΣ A/D
CONVERTER
A RSH and CSH snubber reduces the output impedance
of MCP6031 op amp, which reduces the gain error
caused by switching transients, which occur at the
MCP3421 ADC's sampling rate. The snubber also
maintains feedback stability and avoids AC response
peaking and step response overshoot and ringing
(caused by the op amp’s inductive output impedance
resonating with the ADC’s input capacitance). The cost
for this improvement is low. Best of all, using an op amp
with higher supply current is avoided. See Figure 4-9.
This figure also includes a resistor to balance the
impedance at the ADC's inputs (RBAL) at the sampling
frequency; it may not be needed in all designs.
FIGURE 4-9:
Driving the MCP3421 using
an R-C Snubber.
VDD
IDD
MCP6031
100 k
Ω
1M
Ω
1.4V
VOUT
10
Ω
to
5.5V
I
DD
V
DD
V
OUT
–
10 V/V
() 10
Ω
()
------------------------------------------
=
VIN
1M
Ω
VOUT
MCP6031
100 k
Ω
MCP6541
VREF
VIN
MCP6031
RSH
CSH
1.00 k
Ω
2.2 F
RBAL
1.00 k
Ω
MCP3421
ΔΣ
1.00 k
Ω
ZIND
2.25 M
Ω
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP6031DM-PTPLS | 制造商:Microchip Technology Inc 功能描述:Operational Amplifier Demo Board |
| MCP6031-E/MC | 功能描述:运算放大器 - 运放 SNGL 18V 10kHz Op Amp E Temp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MCP6031E/MS | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:0.9 uA, High Precision Op Amps |
| MCP6031-E/MS | 功能描述:运算放大器 - 运放 S-1.8V 14kHz Op Amp E temp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MCP6031-E/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:0.9 μA, High Precision Op Amps |
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