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參數(shù)資料
| 型號(hào)： | MCP6234 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 20 レA, 300 kHz Rail-to-Rail Op Amp |
| 中文描述： | 20レ甲，300千赫軌至軌運(yùn)算放大器 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 384K |
| 代理商： | MCP6234 |
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MCP6231/2/4
DS21881C-page 8
2005 Microchip Technology Inc.
4.0
APPLICATION INFORMATION
The MCP6231/2/4 family of op amps is manufactured
using Microchip’s state-of-the-art CMOS process and
is specifically designed for low-cost, low-power and
general-purpose applications. The low supply voltage,
low quiescent current and wide bandwidth makes the
MCP6231/2/4 ideal for battery-powered applications.
4.1
Rail-to-Rail Inputs
The MCP6231/2/4 op amps are designed to prevent
phase reversal when the input pins exceed the supply
voltages. Figure 4-1 shows the input voltage exceeding
the supply voltage without any phase reversal.
FIGURE 4-1:
Phase Reversal.
The
MCP6231/2/4
Show No
The input stage of the MCP6231/2/4 op amps use two
differential input stages in parallel. One operates at low
common mode input voltage (V
CM
) and the other at
high V
CM
. With this topology, the device operates with
V
CM
up to 300 mV above V
DD
and 300 mV below V
SS
.
The
input
offset
voltage
V
CM
= V
SS
– 300 mV and V
DD
+ 300 mV to ensure
proper operation.
Input voltages that exceed the input voltage range
(V
SS
– 0.3V to V
DD
+ 0.3V at 25°C) can cause
excessive current to flow into or out of the input pins.
Current beyond ±2 mA can cause reliability problems.
Applications that exceed this rating must be externally
limited with a resistor, as shown in Figure 4-2.
is
measured
at
FIGURE 4-2:
Resistor (R
IN
).
Input Current-Limiting
4.2
Rail-to-Rail Output
The output voltage range of the MCP6231/2/4 op amps
is V
DD
– 35 mV (max.) and V
SS
+ 35 mV (min.) when
R
L
= 10 k
Ω
is connected to V
DD
/2 and V
DD
= 5.5V.
Refer to Figure 2-14 for more information.
4.3
Capacitive Loads
Driving large capacitive loads can cause stability
problems for voltage feedback op amps. As the load
capacitance increases, the feedback loop’s phase
margin decreases and the closed-loop bandwidth is
reduced. This produces gain peaking in the frequency
response, with overshoot and ringing in the step
response. A unity-gain buffer (G = +1) is the most
sensitive to capacitive loads, but all gains show the
same general behavior.
When driving large capacitive loads with these op
amps (e.g., > 60 pF when G = +1), a small series resis-
tor at the output (R
ISO
in Figure 4-3) improves the feed-
back loop’s phase margin (stability) by making the
output load resistive at higher frequencies. The band-
width will be generally lower than the bandwidth with no
capacitive load.
FIGURE 4-3:
stabilizes large capacitive loads.
Output resistor, R
ISO
Figure 4-4 gives recommended R
ISO
values for
different capacitive loads and gains. The x-axis is the
normalized load capacitance (C
L
/G
N
), where G
N
is the
circuit’s noise gain. For non-inverting gains, G
N
and the
signal gain are equal. For inverting gains, G
N
is
1 + |Signal Gain| (e.g., –1 V/V gives G
N
= +2 V/V).
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Time (1 ms/div)
I
V
OUT
V
IN
V
DD
= 5.0V
G = +2 V/V
R
IN
V
---------–
Minimum expected V
2 mA
)
≥
R
IN
Maximum expected V
------------------------------------------------------------------------------
(
)
V
–
2 mA
≥
V
IN
R
IN
V
OUT
MCP623X
+
–
V
IN
R
ISO
V
OUT
MCP623X
+
C
L
–
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|---|---|
| MCP6234-E/MS | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 1.8V 200kHz Extended Temp 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 |
| MCP6234-E/P | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 1.8V 200kHz Extended Temp 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 |
| MCP6234-E/SL | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 1.8V 200 kHz OP E temp 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 |
| MCP6234-E/SN | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 1.8V 200kHz Extended Temp 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 |
| MCP6234-E/ST | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 1.8V 200 kHz OP E temp 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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