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| 型号： | MCP6409T-H/SL |
| 厂商： | Microchip Technology |
| 文件页数： | 11/44页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP QUAD 1.8V 1MHZ 14SOIC |
| 标准包装： | 2,600 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.5 V/µs |
| 增益带宽积： | 1MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 4500µV |
| 电流 - 电源： | 45µA |
| 电流 - 输出 / 通道： | 15mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 6 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
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2009-2011 Microchip Technology Inc.
DS22229D-page 19
MCP6401/1R/1U/2/4/6/7/9
4.6
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 1012
Ω. A 5V difference would
cause 5 pA of current to flow; which is greater than the
MCP6401/1R/1U/2/4/6/7/9 family’s bias current at
+25°C (±1.0 pA, typical).
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 shown in
FIGURE 4-7:
Example Guard Ring Layout
for Inverting Gain.
1.
Non-inverting Gain and Unity-Gain Buffer:
a)
Connect the non-inverting pin (VIN+) to the
input with a wire that does not touch the
PCB surface.
b)
Connect the guard ring to the inverting input
pin (VIN–). This biases the guard ring to the
Common Mode input voltage.
2.
Inverting
Gain
and
Transimpedance
Gain
Amplifiers (convert current to voltage, such as
photo detectors):
a)
Connect the guard ring to the non-inverting
input pin (VIN+). This biases the guard ring
to the same reference voltage as the op
amp (e.g., VDD/2 or ground).
b)
Connect the inverting pin (VIN–) to the input
with a wire that does not touch the PCB
surface.
4.7
Application Circuits
4.7.1
PRECISION HALF-WAVE
RECTIFIER
The precision half-wave rectifier, which is also known
as a super diode, is a configuration obtained with an
operational amplifier in order to have a circuit behave
like an ideal diode and rectifier. It effectively cancels the
forward voltage drop of the diode so that very low level
signals can still be rectified with minimal error. This can
be useful for high-precision signal processing. The
MCP6401/1R/1U/2/4/6/7/9 op amps have high input
impedance, low input bias current and rail-to-rail
input/output, which makes this device suitable for
precision rectifier applications.
Figure 4-8 shows a precision half-wave rectifier and its
transfer characteristic. The rectifier’s input impedance
is determined by the input resistor R1. To avoid loading
effect, it must be driven from a low-impedance source.
When VIN is greater than zero, D1 is OFF, D2 is ON, and
VOUT is zero. When VIN is less than zero, D1 is ON, D2
is OFF, and VOUT is the VIN with an amplification of
-R2/R1.
The rectifier circuit shown in Figure 4-8 has the benefit
that the op amp never goes in saturation, so the only
thing
affecting
its
frequency
response
is
the
amplification and the gain bandwidth product.
.
FIGURE 4-8:
Precision Half-Wave
Rectifier.
Guard Ring
VIN–VIN+
VSS
VOUT
R2
D1
D2
R1
VIN
VOUT
VIN
-R2/R1
Transfer Characteristic
Precision Half-Wave Rectifier
MCP6401
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