MCP602 N/A, MCP602 Datasheet - Page 12

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MCP602

Manufacturer Part Number
MCP602
Description
MCP601-2-3-4
Manufacturer
N/A
Datasheet

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MCP601/2/3/4
FIGURE 3-3:
for capacitive loads.
After selecting R
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
the response is reasonable.
3.5
With this family of operational amplifiers, the power
supply pin (V
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.
3.6
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
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:
DS21314E-page 12
100
1k
10
10p
1,000
100
10
Supply Bypass
PCB Surface Leakage
10
Guard Ring
Normalized Load Capacitance; C
DD
for single supply) should have a local
ISO
for your circuit, double-check the
100p
100
Recommended R
Example guard ring layout.
G
G
N
N
= +1
V
12
+2
IN–
. A 5V difference would
V
IN+
1n
1,000
ISO
L
/ G
ISO
’s value until
N
(F)
values
10n
10,000
1.
2.
3.7
3.7.1
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:
Key filter.
FIGURE 3-6:
Feedback filter.
The MCP601/2/3/4 family of operational amplifiers
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
V
V
IN
IN
Connect the guard ring to the inverting input pin
(V
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
transimpedance amplifiers (convert current to
voltage, such as photo detectors). This biases
the guard ring to the same reference voltage as
the op amp (e.g., V
IN–
618 k
382 k
47 nF
Typical Applications
C
) for non-inverting gain amplifiers, including
R
R
2
1
IN+
1
ANALOG FILTERS
) for inverting gain amplifiers and
1.00 M
47 nF
618 k
641 k
V
22 nF
C
R
R
R
DD
C
1
3
2
2
2
/2
2
2
DD
nd
nd
2003 Microchip Technology Inc.
/2 or ground).
®
order, low-pass Sallen-
order, low-pass Multiple-
MCP60X
software.
MCP60X
8.2 nF
C
1
G = +1 V/V
f
P
G = -1 V/V
f
P
= 10 Hz
= 10 Hz
V
V
OUT
OUT

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