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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)： | 9/28頁 |
| 文件大?。?/td> | 384K |
| 代理商： | MCP6234 |
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2005 Microchip Technology Inc.
DS21881C-page 9
MCP6231/2/4
FIGURE 4-4:
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 MCP6231/2/4 SPICE macro
model are very helpful. Modify R
ISO
’s value until the
response is reasonable.
4.4
Supply Bypass
With this op amp, 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 can use 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 nearby analog parts.
4.5
Unused Op Amps
An unused op amp in a quad package (MCP6234)
should be configured as shown in Figure 4-5. Both
circuits prevent the output from toggling and causing
crosstalk. Circuit A can use any reference voltage
between the supplies, provides a buffered DC voltage
and minimizes the supply current draw of the unused
op amp. Circuit B minimizes the number of
components, but may draw a little more supply current
for the unused op amp.
FIGURE 4-5:
Unused Op Amps.
4.6
PCB Surface Leakage
In applications where low input bias current is critical,
Printed Circuit Board (PCB) 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
Ω
. A 5V difference would
cause 5 pA of current to flow, which is greater than the
MCP6231/2/4 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 4-6.
FIGURE 4-6:
for Inverting Gain.
Example Guard Ring Layout
1.
Non-inverting Gain and Unity-Gain Buffer:
a.
Connect the non-inverting pin (V
IN
+) to the
input with a wire that does not touch the
PCB surface.
b.
Connect the guard ring to the inverting input
pin (V
IN
–). This biases the guard ring to the
common mode input voltage.
Inverting Gain and Transimpedance Amplifiers
(convert current to voltage, such as photo
detectors):
a.
Connect the guard ring to the non-inverting
input pin (V
IN
+). This biases the guard ring
to the same reference voltage as the op
amp (e.g., V
DD
/2 or ground).
b.
Connect the inverting pin (V
IN
–) to the input
with a wire that does not touch the PCB
surface.
2.
100
1,000
10,000
10p
100p
1000
10000
Normalized Load Capacitance; C
L
/G
N
(F)
R
I
:
)
G
N
= 1 V/V
G
N
= 2 V/V
G
N
t
4 V/V
1k
V
DD
V
DD
V
DD
MCP6234 (A)
MCP6234 (B)
Guard Ring
V
SS
V
IN
–
V
IN
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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