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| 型号： | MCP602T-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 6/34页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP DUAL SNGL SUPPLY 8TSSOP |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2.3 V/µs |
| 增益带宽积： | 2.8MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 700µV |
| 电流 - 电源： | 230µA |
| 电流 - 输出 / 通道： | 22mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 带卷 (TR) |
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MCP601/1R/2/3/4
DS21314G-page 14
2007 Microchip Technology Inc.
4.6
Unused Op Amps
An unused op amp in a quad package (MCP604)
should be configured as shown in Figure 4-6. These
circuits prevent the output from toggling and causing
crosstalk. Circuits A sets the op amp at its minimum
noise gain. The resistor divider produces any desired
reference voltage within the output voltage range of the
op amp; the op amp buffers that reference voltage.
Circuit B uses the minimum number of components
and operates as a comparator, but it may draw more
current.
FIGURE 4-6:
Unused Op Amps.
4.7
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 1012
Ω. A 5V difference
would cause 5 pA of current to flow. This is greater
than the MCP601/1R/2/3/4 family’s bias current at
+25°C (1 pA, typical).
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 4-7:
Example Guard Ring layout.
1.
Connect the guard ring to the inverting input pin
(VIN–) for non-inverting gain amplifiers, includ-
ing unity-gain buffers. This biases the guard ring
to the common mode input voltage.
2.
Connect the guard ring to the non-inverting input
pin (VIN+) 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., VDD/2 or ground).
4.8
Typical Applications
4.8.1
ANALOG FILTERS
Figure 4-8 and Figure 4-9 show low-pass, second-
order, Butterworth filters with a cutoff frequency of
10 Hz. The filter in Figure 4-8 has a non-inverting gain
of +1 V/V, and the filter in Figure 4-9 has an inverting
gain of -1 V/V.
FIGURE 4-8:
Second-Order, Low-Pass
Sallen-Key Filter.
FIGURE 4-9:
Second-Order, Low-Pass
Multiple-Feedback Filter.
The MCP601/1R/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 Design Aids; see
VDD
MCP604 (A)
MCP604 (B)
R1
R2
VDD
VREF
V
REF
V
DD
R
2
R
1
R
2
+
------------------
=
Guard Ring
VIN– VIN+
C2
VOUT
R1
R2
C1
VIN
47 nF
382 k
Ω 641 kΩ
22 nF
G = +1 V/V
fP = 10 Hz
MCP60X
+
–
C2
VOUT
R1
R3
C1
VIN
R2
VDD/2
G = -1 V/V
fP = 10 Hz
618 k
Ω
618 k
Ω 1.00 MΩ
8.2 nF
47 nF
MCP60X
–
+
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