參數(shù)資料
型號： MCP6002-I/SN
廠商： Microchip Technology
文件頁數(shù)： 7/42頁
文件大小： 0K
描述： IC OPAMP 1.8V 1MHZ DUAL 8-SOIC
標(biāo)準(zhǔn)包裝： 100
放大器類型： 通用
電路數(shù)： 2
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.6 V/µs
增益帶寬積： 1MHz
電流 - 輸入偏壓： 1pA
電壓 - 輸入偏移： 4500µV
電流 - 電源： 100µA
電流 - 輸出 / 通道： 23mA
電壓 - 電源，單路/雙路(±)： 1.8 V ~ 6 V
工作溫度： -40°C ~ 85°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： 管件
產(chǎn)品目錄頁面： 678 (CN2011-ZH PDF)
2009 Microchip Technology Inc.
DS21733J-page 15
MCP6001/1R/1U/2/4
FIGURE 4-6:
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
UNITY-GAIN BUFFER
The rail-to-rail input and output capability of the
MCP6001/2/4 op amp is ideal for unity-gain buffer
applications. The low quiescent current and wide
bandwidth makes the device suitable for a buffer
configuration in an instrumentation amplifier circuit, as
shown in Figure 4-7.
FIGURE 4-7:
Instrumentation Amplifier
with Unity-Gain Buffer Inputs.
4.7.2
ACTIVE LOW-PASS FILTER
The MCP6001/2/4 op amp’s low input bias current
makes it possible for the designer to use larger
resistors and smaller capacitors for active low-pass
filter
applications.
However,
as
the
resistance
increases,
the
noise
generated
also
increases.
Parasitic capacitances and the large value resistors
could also modify the frequency response. These
trade-offs need to be considered when selecting circuit
elements.
Usually, the op amp bandwidth is 100x the filter cutoff
frequency (or higher) for good performance. It is
possible to have the op amp bandwidth 10X higher
than the cutoff frequency, thus having a design that is
more sensitive to component tolerances.
Figure 4-8 shows a second-order Butterworth filter with
100 kHz cutoff frequency and a gain of +1 V/V; the op
amp bandwidth is only 10x higher than the cutoff
frequency. The component values were selected using
Microchip’s FilterLab software.
FIGURE 4-8:
Active Second-Order
Low-Pass Filter.
Guard Ring
V
SS
VIN-VIN+
VIN1
R2
MCP6002
VIN2
R2
MCP6002
VREF
MCP6001
VOUT
R1
–
+
–
+
–
+
1/2
V
OUT
V
IN2
V
IN1
–
()
R
1
R
2
------
V
REF
+
=
R1 = 20 kΩ
R2 = 10 kΩ
14.3 k
Ω
MCP6002
VOUT
53.6 k
Ω
100 pF
VIN
33 pF
+
–
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