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| 型号： | MCP6V27T-E/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 20/50页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP DUAL AUTO-ZERO 8SOIC |
| 标准包装： | 3,300 |
| 放大器类型： | 自动调零 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 1 V/µs |
| 增益带宽积： | 2MHz |
| 电流 - 输入偏压： | 7pA |
| 电压 - 输入偏移： | 2µV |
| 电流 - 电源： | 620µA |
| 电流 - 输出 / 通道： | 22mA |
| 电压 - 电源，单路/双路(±)： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
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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
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