參數(shù)資料
型號(hào)： MCP6V28T-E/SN
廠商： Microchip Technology
文件頁(yè)數(shù)： 20/50頁(yè)
文件大小： 0K
描述： IC OPAMP AUTO-ZERO SGL 8SOIC
標(biāo)準(zhǔn)包裝： 3,300
放大器類型： 自動(dòng)調(diào)零
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 1 V/µs
增益帶寬積： 2MHz
電流 - 輸入偏壓： 7pA
電壓 - 輸入偏移： 2µV
電流 - 電源： 620µA
電流 - 輸出 / 通道： 22mA
電壓 - 電源，單路/雙路(±)： 2.3 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOICN
包裝： 帶卷 (TR)
2011 Microchip Technology Inc.
DS25007B-page 27
MCP6V26/7/8
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 perfor-
mance. 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 (e.g., encapsulant)
- 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 auto-zeroed 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 tribo-electric 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 ceramic) to output small voltages. Use more
appropriate capacitor types in the signal path and
minimize mechanical stresses and vibration.
Humidity can cause electro-chemical 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 4-12 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,
there is a minimum of filtering, and the CMRR is good
enough for moderate common mode noise.
FIGURE 4-12:
Simple Design.
Figure 4-13 shows a higher performance circuit for
Wheatstone bridges. This circuit is symmetric and has
high CMRR. Using a differential input to the ADC helps
with the CMRR.
FIGURE 4-13:
High Performance Design.
VDD
RR
100R
0.01C
ADC
VDD
0.2R
3k
Ω
U1
MCP6V26
20 k
Ω
1F
200
Ω
20 k
Ω
1F
ADC
VDD
200
Ω
200
Ω
3k
Ω
3k
Ω
1F
RR
VDD
10 nF
200
Ω
U1A
MCP6V27
U1B
MCP6V27
相關(guān)PDF資料
PDF描述
TSW-140-25-T-S-RA CONN HEADER 40POS .100" SNGL R/A
MCP6V28T-E/MS IC OPAMP AUTO-ZERO SGL 8SOIC
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MTLW-107-05-G-D-170 CONN HEADER 14POS 1.00" DL GOLD
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MCP6V31T-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
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
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