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參數(shù)資料
| 型號： | MCP6V31T-E/OT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 17/40頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP SGL ZERO DRIFT SOT23-5 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 零漂移 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.13 V/µs |
| 增益帶寬積： | 300kHz |
| 電流 - 輸入偏壓： | 5pA |
| 電壓 - 輸入偏移： | 8µV |
| 電流 - 電源： | 23µA |
| 電流 - 輸出 / 通道： | 21mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SC-74A，SOT-753 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-5 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | MCP6V31T-E/OTDKR |
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MCP6V31/1U
DS25127A-page 24
2012 Microchip Technology Inc.
Typical thermojunctions have temperature to voltage
conversion coefficients of 1 to 100 V/°C (sometimes
higher).
Microchip’s AN1258 (“Op Amp Precision Design: PCB
Layout Techniques
”) contains in-depth information on
PCB layout techniques that minimize thermojunction
effects. It also discusses other effects, such as
crosstalk, impedances, mechanical stresses and
humidity.
4.3.11.2
Crosstalk
DC crosstalk causes offsets that appear as a larger
input offset voltage. Common causes include:
Common mode noise (remote sensors)
Ground loops (current return paths)
Power supply coupling
Interference from the mains (usually 50 Hz or 60 Hz),
and other AC sources, can also affect the DC
performance. Non-linear distortion can convert these
signals to multiple tones, including a DC shift in voltage.
When the signal is sampled by an ADC, these AC
signals can also be aliased to DC, causing an apparent
shift in offset.
To reduce interference:
- Keep traces and wires as short as possible
- Use shielding
- Use ground plane (at least a star ground)
- Place the input signal source near to the DUT
- Use good PCB layout techniques
- Use a separate power supply filter (bypass
capacitors) for these zero-drift op amps
4.3.11.3
Miscellaneous Effects
Keep the resistances seen by the input pins as small
and as near to equal as possible, to minimize bias-
current-related offsets.
Make the (trace) capacitances seen by the input pins
small and equal. This is helpful in minimizing switching
glitch-induced offset voltages.
Bending a coax cable with a radius that is too small
causes a small voltage drop to appear on the center
conductor (the triboelectric effect). Make sure the
bending radius is large enough to keep the conductors
and insulation in full contact.
Mechanical stresses can make some capacitor types
(such as some ceramics) to output small voltages. Use
more appropriate capacitor types in the signal path and
minimize mechanical stresses and vibration.
Humidity can cause electrochemical potential voltages
to appear in a circuit. Proper PCB cleaning helps, as
does the use of encapsulants.
4.4
Typical Applications
4.4.1
WHEATSTONE BRIDGE
Many sensors are configured as Wheatstone bridges.
Strain gauges and pressure sensors are two common
examples. These signals can be small and the
common mode noise large. Amplifier designs with high
differential gain are desirable.
Figure 4-11 shows how to interface to a Wheatstone
bridge with a minimum of components. Because the
circuit is not symmetric, the ADC input is single ended,
and there is a minimum of filtering, the CMRR is good
enough for moderate common mode noise.
FIGURE 4-11:
Simple Design.
4.4.2
RTD SENSOR
The ratiometric circuit in Figure 4-12 conditions a two-
wire RTD, for applications with a limited temperature
range. U1 acts a difference amplifier, with a low
frequency pole. The sensor’s wiring resistance (RW) is
corrected in firmware. Failure (open) of the RTD is
detected by an out-of-range voltage.
FIGURE 4-12:
RTD Sensor.
VDD
RR
100R
0.01C
ADC
VDD
0.2R
1k
U1
MCP6V31
RF
10 nF
ADC
VDD
RN
1.0 F
VDD
RW
RT
RB
RRTD
RG
100
1.00 k
4.99 k
34.8 k
2.00 M
10.0 k
U1
MCP6V31
RW
10.0 k
RF
2.00 M
10 nF
100 nF
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| MCP6V31UT-E/LT | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single, Zero Drift Op Amp, 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 |
| MCP6V31UT-E/OT | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single, Zero Drift Op Amp, 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 |
| MCP6V31UT-E/OT-CUT TAPE | 制造商:Microchip Technology 功能描述:Cut Tape 制造商:Microchip Technology 功能描述:SP Amp Zero Drift Amplifier Single R-R I/O 5.5V 5-Pin SOT-23 T/R |
| MCP6XXXDM-FLTR | 功能描述:有源濾波器開發(fā)工具 Act Filter Demo BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 工具用于評估:MAX7408-MAX7415, MAX7418-MAX7425 截止頻率:1 Hz to 15 kHz 工作電源電壓:3 V, 5 V |
| MCP6XXXEV-AMP1 | 功能描述:放大器 IC 開發(fā)工具 MCP6XXX Amp Eval Brd 1 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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