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MCP601T-I/OT Datasheet

  • MCP601T-I/OT

  • OP AMP, CMOS RRO/P, SOT-23-5, 601; No. of Amplifiers:1; Op A...

  • 28頁

  • Microchip   Microchip

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MCP601/602/603/604
Circuit examples of ring implementations are shown in
Figure 3-8. In Figure 3-8A, B and C, the guard ring is
biased to the common-mode voltage of the amplifier.
This type of guard ring is most effective for applications
where the common-mode voltage of the input stage
changes, such as buffers, inverting gain amplifiers or
instrumentation amplifiers.
The strategy shown in Figure 3-8D, biases the com-
mon-mode voltage and guard ring to ground. This type
of guard ring is typically used in precision photo sens-
ing circuits.
Figure 3-8A
3.5.2
SIGNAL COUPLING
The input pins of the MCP601/602/603/604 amplifiers
have a high impedance providing an opportunity for
noise injection, if layout issues are not considered.
These high impedance input terminals are sensitive to
injected currents. This can occur if the trace from a high
impedance input is next to a trace that has fast chang-
ing voltages, such as a digital or clock signal. When a
high impedance trace is in close proximity to a trace
with these types of voltage changes, charge is capaci-
tively coupled into the high impedance trace.
C=
w x L x e
o
x e
r
d
pF
PCB Trace
MCP60X
L
d
w
(typ 0.003mm)
Figure 3-8B
w= thickness of PCB trace
PCB
Cross-Section
L
= length of PCB trace
d
= distance between the two PCB traces
FIGURE 3-9:
Capacitors can be built with PCB
traces allowing for coupling of signals from one trace
to another.
As shown in Figure 3-9, the value of the capacitance
between two traces is primarily dependent on the dis-
tance (d) between the traces and the distance that the
two traces are in parallel (L). From this model, the
amount of current generated into the high impedance
trace is equal to:
I = C
鈭俈/鈭倀
MCP60X
Voltage
Reference
(could be ground)
MCP60X
Figure 3-8C
where:
I
equals the current that appears on the high
impedance trace,
C
equals the value of capacitance between the two
PCB traces,
鈭俈
equals the change in voltage of the trace that is
switching, and
鈭倀
equals the amount of time that the voltage
change took to get from one level to the next.
Figure 3-8D
V
DD
MCP60X
FIGURE 3-8:
Examples of how to design PC Board
traces to minimize leakage paths to the high
impedance input pins of the MCP601/602/603/604
amplifiers.
錚?/div>
2000 Microchip Technology Inc.
DS21314D-page 13

MCP601T-I/OT 產(chǎn)品屬性

  • Microchip

  • 運算放大器 - 運放

  • 1

  • 75 dB

  • 2 mV

  • 60 pA

  • 3 V, 5 V

  • SMD/SMT

  • SOT-23-5

  • 2.3 V/us

  • No

  • + 85 C

  • Reel

  • - 40 C

  • 3000

  • 6 V

  • 2.7 V

  • CMOS

  • 115 dB

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