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參數(shù)資料
| 型號： | MCP604T |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 2.7V to 5.5V Single-Supply CMOS Op Amps |
| 中文描述： | 2.7V至5.5V單電源CMOS運(yùn)算放大器 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大小： | 493K |
| 代理商： | MCP604T |
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MCP601/2/3/4
DS21314F-page 12
2004 Microchip Technology Inc.
FIGURE 3-3:
for capacitive loads.
Recommended R
ISO
values
Once you’ve selected R
ISO
for your circuit, double-
check the resulting frequency response peaking and
step response overshoot in your circuit. Evaluation on
the bench and simulations with the MCP601/2/3/4
SPICE macro model are very helpful. Modify R
ISO
’s
value until the response is reasonable.
3.5
Supply Bypass
With this family of op amps, 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-fre-
quency 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.
3.6
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
. A 5V difference
would cause 5 pA of current to flow. This is greater
than the MCP601/2/3/4 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 3-4.
FIGURE 3-4:
Example Guard Ring layout.
1.
Connect the guard ring to the inverting input pin
(V
IN
–) for non-inverting gain amplifiers, includ-
ing unity-gain buffers. This biases the guard ring
to the common mode input voltage.
Connect the guard ring to the non-inverting input
pin (V
IN
+) for inverting gain amplifiers and
transimpedance amplifiers (converts current to
voltage, such as photo detectors). This biases
the guard ring to the same reference voltage as
the op amp (e.g., V
DD
/2 or ground).
2.
3.7
Typical Applications
3.7.1
ANALOG FILTERS
Figure 3-5 and Figure 3-6 show low-pass, second-
order, Butterworth filters with a cutoff frequency of
10 Hz. The filter in Figure 3-5 has a non-inverting gain
of +1 V/V, and the filter in Figure 3-6 has an inverting
gain of -1 V/V.
FIGURE 3-5:
Sallen-Key Filter.
Second-Order, Low-Pass
FIGURE 3-6:
Multiple-Feedback Filter.
Second-Order, Low-Pass
The MCP601/2/3/4 family of op amps have low input
bias current, which allows the designer to select larger
resistor values and smaller capacitor values for these
filters. This helps produce a compact PCB layout.
These filters, and others, can be designed using
Microchip’s FilterLab
software.
10
100
1,000
10
100
1,000
10,000
Normalized Load Capacitance; C
L
/ G
N
(F)
R
I
:
)
10p
100p
1n
10n
10
100
1k
G
N
= +1
G
N
t
+2
Guard Ring
V
IN–
V
IN+
C
2
V
OUT
R
1
R
2
C
1
V
IN
47 nF
382 k
641 k
22 nF
G = +1 V/V
f
P
= 10 Hz
MCP60X
+
–
C
2
V
OUT
R
1
R
3
C
1
V
IN
R
2
V
DD
/2
G = -1 V/V
f
P
= 10 Hz
618 k
618 k
1.00 M
8.2 nF
47 nF
MCP60X
–
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP604T-E/SL | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 2.7V 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 |
| MCP604T-E/ST | 功能描述:運(yùn)算放大器 - 運(yùn)放 Quad 2.7V 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 |
| MCP604T-ECH | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V to 6.0V Single Supply CMOS Op Amps |
| MCP604T-EOT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V to 6.0V Single Supply CMOS Op Amps |
| MCP604T-EP | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V to 6.0V Single Supply CMOS Op Amps |
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