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參數(shù)資料
| 型號： | MCP6291 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1.0 mA, 10 MHz Rail-to-Rail Op Amp |
| 中文描述： | 1.0毫安，10 MHz的軌到軌運(yùn)算放大器 |
| 文件頁數(shù)： | 11/32頁 |
| 文件大小： | 589K |
| 代理商： | MCP6291 |
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2004 Microchip Technology Inc.
DS21812D-page 11
MCP6291/2/3/4/5
4.0
APPLICATION INFORMATION
The MCP6291/2/3/4/5 family of op amps is manufac-
tured using Microchip’s state-of-the-art CMOS
process, specifically designed for low-cost, low-power
and general purpose applications. The low supply
voltage, low quiescent current and wide bandwidth
makes the MCP6291/2/3/4/5 ideal for battery-powered
applications.
4.1
Rail-to-Rail Inputs
The MCP6291/2/3/4/5 op amp is 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:
No Phase Reversal.
The MCP6291/2/3/4/5 Show
The input stage of the MCP6291/2/3/4/5 op amps use
two differential CMOS input stages in parallel. One
operates at low common mode input voltage (V
CM
),
while the other operates at high V
CM
. With this topol-
ogy, the device operates with V
CM
up to 0.3 mV above
V
DD
and 0.3 mV below V
SS
. The Input Offset Voltage
(V
OS
) is measured at V
CM
= V
SS
– 0.3 mV and
V
DD
+ 0.3 mV to ensure proper operation.
Input voltages that exceed the absolute maximum volt-
age (V
SS
– 0.3V to V
DD
+ 0.3V) can cause excessive
current to flow into or out of the input pins. Current
beyond ±2 mA can cause reliability problems. Applica-
tions that exceed this rating must be externally limited
with a resistor, as shown in Figure 4-2.
FIGURE 4-2:
Resistor (R
IN
).
Input Current Limiting
4.2
Rail-to-Rail Output
The output voltage range of the MCP6291/2/3/4/5 op
amp is V
DD
– 15 mV (min.) and V
SS
+ 15 mV (max.)
when R
L
= 10 k
is connected to V
DD
/2 and
V
DD
= 5.5V. Refer to Figure 2-16 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, though all gains show the
same general behavior.
When driving large capacitive loads with these op
amps (e.g., > 100 pF when G = +1), a small series
resistor at the output (R
ISO
in Figure 4-3) improves the
feedback 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 differ-
ent 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
1
2
3
4
5
6
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
Time (1 ms/div)
I
V
DD
= 5.0V
G = +2V/V
V
IN
V
OUT
R
IN
V
----------------------------------------------------------------------------------
Minimum expected V
2 mA
)
≥
R
IN
Maximum expected V
------------------------------------------------------------------------------------
(
)
V
–
2 mA
≥
V
IN
R
IN
V
OUT
–
+
MCP629X
V
IN
R
ISO
V
OUT
C
L
–
MCP629X
+
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MCP6291-E/MS | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 10MHz 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 |
| MCP6291-E/OT | 制造商:Microchip Technology Inc 功能描述: |
| MCP6291-E/P | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 10MHz 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 |
| MCP6291-E/SN | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 10MHz 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 |
| MCP6291RT-E/OT | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single 10 MHz OP E temp rvs pinout 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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