參數(shù)資料
型號(hào)： MCP6444T-E/SL
廠商： Microchip Technology
文件頁(yè)數(shù)： 8/46頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP QUAD 1.6V 9KHZ 14SOIC
標(biāo)準(zhǔn)包裝： 2,600
放大器類型： 通用
電路數(shù)： 4
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.003 V/µs
增益帶寬積： 9kHz
電流 - 輸入偏壓： 1pA
電壓 - 輸入偏移： 4500µV
電流 - 電源： 0.45µA
電流 - 輸出 / 通道： 22mA
電壓 - 電源，單路/雙路(±)： 1.4 V ~ 6 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 14-SOICN
包裝： 帶卷 (TR)
MCP6441/2/4
DS22257C-page 16
2010-2012 Microchip Technology Inc.
4.6.2
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 behaving
like an ideal diode and rectifier. It effectively cancels the
forward voltage drop of the diode in such a way that
very low level signals can still be rectified, with minimal
error. This can be useful for high-precision signal
processing. The MCP6441/2/4 op amp has 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 the
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.
4.6.3
INSTRUMENTATION AMPLIFIER
The MCP6441/2/4 op amp is well suited for condition-
ing sensor signals in battery-powered applications.
Figure 4-9 shows a two op amp instrumentation
amplifier, using the MCP6441/2/4 device, that works
well for applications requiring rejection of Common
Mode noise at higher gains. The reference voltage
(VREF) is supplied by a low-impedance source. In sin-
gle supply applications, VREF is typically VDD/2.
FIGURE 4-9:
Two Op Amp
Instrumentation Amplifier.
VOUT
R2
D1
D2
R1
VIN
VOUT
VIN
-R2/R1
Transfer Characteristic
Precision Half-Wave Rectifier
MCP6441
V
OUT
V
1
V
2
–
() 1
R
1
R
2
------
2R
1
R
G
---------
++
V
REF
+
=
VREF R1
R2
R1
VOUT
RG
V2
V1
1/2 MCP6442
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