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參數(shù)資料
| 型號： | MCP6021 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Rail-to-Rail Input/Output, 10 MHz Op Amps |
| 中文描述： | 軌到軌輸入/輸出，10兆赫運算放大器 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 618K |
| 代理商： | MCP6021 |
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2003 Microchip Technology Inc.
DS21685B-page 13
MCP6021/2/3/4
To use the internal mid-supply reference for an
inverting gain circuit, connect the V
REF
pin to the non-
inverting input, as shown in Figure 3-4. The capacitor
C
B
helps reduce power supply noise on the output.
FIGURE 3-4:
V
REF
(MCP6021 and MCP6023 only).
If you don’t need the mid-supply reference, leave the
V
REF
pin open.
Inverting gain circuit using
3.5
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.
When driving large capacitive loads with these op
amps (e.g., > 60 pF when G = +1), a small series
resistor at the output (R
ISO
in Figure 3-5) improves the
feedback loop’s phase margin (stability) by making the
load resistive at higher frequencies. The bandwidth will
be generally lower than the bandwidth with no
capacitive load.
FIGURE 3-5:
stabilizes large capacitive loads.
Output resistor R
ISO
Figure 3-6 gives recommended R
ISO
values for
different capacitive laods 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
gain are equal. For inverting gains, G
N
is 1+|Gain| (e.g.,
-1 V/V gives G
N
= +2 V/V).
FIGURE 3-6:
for capacitive loads.
Recommended R
ISO
values
After selecting R
ISO
for your circuit, double-check the
resulting frequency response peaking and step
response overshoot. Evaluation on the bench and
simulations with the MCP6021/2/3/4 Spice macro
model are very helpful. Modify R
ISO
’s value until the
response is reasonable.
3.6
Supply Bypass
With this family of operational amplifiers, the power
supply pin (V
DD
for single supply) should have a local
bypass capacitor (i.e., 0.01 μF to 0.1 μF) within 2 mm
for good, high-frequency performance. It also needs a
bulk capacitor (i.e., 1 μF or larger) within 100 mm to
provide large, slow currents. This bulk capacitor can be
shared with other parts.
3.7
PCB Surface Leakage
In applications where low input bias current is critical,
PCB (printed circuit board) surface-leakage effects
need to be considered. Surface leakage is caused by
humidity, dust or other contamination on the board.
Under low humidity conditions, a typical resistance
between nearby traces is 10
12
. A 5V difference would
cause 5 pA of current to flow, which is greater than the
MCP6021/2/3/4 family’s bias current at 25°C (1 pA,
typ).
The easiest way to reduce surface leakage is to use a
guard ring around sensitive pins (or traces). The guard
ring is biased at the same voltage as the sensitive pin.
An example of this type of layout is shown in Figure 3-7.
FIGURE 3-7:
Example guard ring layout.
V
IN
R
G
R
F
V
OUT
V
REF
C
B
V
IN
MCP602X
R
ISO
V
OUT
C
L
10
100
1,000
10
100
1,000
10,000
Normalized Capacitance; C
L
/G
N
(pF)
R
I
:
)
G
N
t
+1
Guard Ring
V
IN
– V
IN
+
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相關(guān)代理商/技術(shù)參數(shù) |
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| MCP6021_06 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Rail-to-Rail Input/Output, 10 MHz Op Amps |
| MCP6021_09 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Rail-to-Rail Input/Output, 10 MHz Op Amps |
| MCP6021-E/MS | 功能描述:運算放大器 - 運放 Single 2.5V 10 MHz 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 |
| MCP6021-E/OT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Rail-to-Rail Input/Output, 10 MHz Op Amps |
| MCP6021-E/P | 功能描述:運算放大器 - 運放 Single 2.5V 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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