參數(shù)資料
型號(hào)： MCP6143
廠商： Microchip Technology Inc.
英文描述： 600 nA, Non-Unity Gain Rail-to-Rail Input/Output Op Amps
中文描述： 600 nA的，非統(tǒng)一增益軌到軌輸入/輸出運(yùn)算放大器
文件頁(yè)數(shù)： 11/32頁(yè)
文件大?。?/td> 624K
代理商： MCP6143
2002 Microchip Technology Inc.
21668A-page 11
MCP6141/2/3/4
FIGURE 3-2:
non-inverting amplifier configuration.
Noise gain for inverting and
Figure 3-2 shows non-inverting and inverting amplifier
circuits. In order for the amplifiers to be stable, the
noise gain should meet the specified requirement:
EQUATION
Note that an inverting signal gain of G = -9 V/V corre-
sponds to a noise gain G
n
= +10 V/V.
Figure 3-3 shows a unity gain buffer and integrator that
are unstable when used with the MCP6141/2/3/4 fam-
ily. However, they are suitable for the MCP6041/2/3/4
family.
FIGURE 3-3:
suitable for the MCP6141/2/3/4 family.
Typical Circuits that are not
Note that the integrator circuit in Figure 3-3 becomes
unity gain at high frequencies because of the capaci-
tor. Therefore, this circuit is unstable for the
MCP6141/2/3/4.
3.6
Capacitive Load and Stability
Driving capacitive loads can cause stability problems
with voltage feedback op amps. Figure 2-21 shows how
increasing the load capacitance will decrease the phase
margin. While a phase margin above 60° is ideal, 45° is
on the verge of instability. As can be seen, up to
C
L
= 150 pF can be placed on the MCP6141/2/3/4 op
amp outputs without any problems, while 250 pF cre-
ates a 45° phase margin.
When the op amp is required to drive large capacitive
loads (C
L
>150 pF), a small series resistor (R
ISO
in
Figure 3-4) at the output of the amplifier improves the
phase margin. This resistor makes the output load
resistive at higher frequencies, which improves the
phase margin. The bandwidth reduction caused by the
capacitive load, however, is not changed. To select
R
ISO
, start with 1 k
, then use the MCP6141 SPICE
macro model and bench testing to adjust R
ISO
until
there is a minimum frequency response peaking.
FIGURE 3-4:
capacitive loads.
Amplifier circuit for heavy
3.7
The MCP6143 Chip Select (CS)
Option
The MCP6143 is a single amplifier with a chip select
(CS) option. When CS is pulled high, the supply current
drops to 20 pA (typ.) and goes through the CS pin to
V
SS
. When this happens, the amplifier is put into a high
impedance state. By pulling CS low, the amplifier is
enabled. If the CS pin is left floating, the amplifier will
not operate properly. Figure 3-5 shows the output
voltage and supply current response to a CS pulse.
V
IN
V
OUT
MCP614X
R
F
R
G
V
IN
V
OUT
MCP614X
R
F
R
G
Non-inverting noise gain: 1 + R
F
/R
G
≥
+10 V/V
Inverting noise gain: 1 + R
F
/R
G
≥
+10 V/V
G
n
1
R
F
R
G
------
+
10V/V
≥
=
V
IN
V
OUT
V
IN
V
OUT
MCP604X
C
R
MCP604X
Integrator:
Unstable for MCP614X
Unity gain buffer:
Unstable for MCP614X
V
IN
R
ISO
V
OUT
MCP614X
C
L
R
1
R
2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP6143-E/MS 功能描述:運(yùn)算放大器 - 運(yùn)放 G>10 Sgl 1.6V 100kHz 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
MCP6143-E/P 功能描述:運(yùn)算放大器 - 運(yùn)放 G>10 Sgl 1.6V 100kHz 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
MCP6143-E/SN 功能描述:運(yùn)算放大器 - 運(yùn)放 G>10 Sgl 1.6V 100kHz 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
MCP6143-I/MS 功能描述:運(yùn)算放大器 - 運(yùn)放 G>10 Sgl 1.6V 100kHz 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
MCP6143-I/P 功能描述:運(yùn)算放大器 - 運(yùn)放 G>10 Sgl 1.6V 100kHz 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
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