MCP602-I/P Microchip Technology, MCP602-I/P Datasheet - Page 14

• Manufacturer Part Number: MCP602-I/P
• Description: IC OPAMP DUAL SNGL SUPPLY 8DIP
• Manufacturer: Microchip Technology

Specifications of MCP602-I/P

• Slew Rate: 2.3 V/µs
• Package / Case: 8-DIP (0.300", 7.62mm)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 2.8MHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 700µV
• Current - Supply: 230µA
• Current - Output / Channel: 22mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Number Of Channels: 2
• Common Mode Rejection Ratio (min): 75 dB
• Input Offset Voltage: 2 mV
• Input Bias Current (max): 60 pA
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Shutdown: No
• Supply Voltage (max): 6 V
• Supply Voltage (min): 2.7 V
• Technology: CMOS
• Voltage Gain Db: 115 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP601/1R/2/3/4
4.6
An unused op amp in a quad package (MCP604)
should be configured as shown in
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:
4.7
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
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
FIGURE 4-7:
1.
DS21314G-page 14
V
DD
¼ MCP604 (A)
Connect the guard ring to the inverting input pin
(V
ing unity-gain buffers. This biases the guard ring
to the common mode input voltage.
R
R
V
IN
REF
4-7.
1
2
–) for non-inverting gain amplifiers, includ-
Unused Op Amps
PCB Surface Leakage
Guard Ring
=
V
V
DD
DD
⋅
------------------
R
1
R
Unused Op Amps.
Example Guard Ring layout.
+
2
V
R
2
REF
V
IN–
12
V
IN+
Ω. A 5V difference
Figure
¼ MCP604 (B)
V
4-6. These
DD
2.
4.8
4.8.1
Figure 4-8
order, Butterworth filters with a cutoff frequency of
10 Hz. The filter in
of +1 V/V, and the filter in
gain of -1 V/V.
FIGURE 4-8:
Sallen-Key Filter.
FIGURE 4-9:
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 Section 5.2 “FilterLab®
Software” and Section 5.3 “Mindi™ Simulatior
Tool”.
V
V
IN
IN
Connect the guard ring to the non-inverting input
pin (V
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
618 kΩ 1.00 MΩ
382 kΩ 641 kΩ
47 nF
Typical Applications
R
C
R
1
2
IN
1
ANALOG FILTERS
and
+) for inverting gain amplifiers and
618 kΩ
47 nF
Figure 4-9
V
22 nF
C
R
R
DD
Figure 4-8
R
C
1
3
2
2
2
/2
Second-Order, Low-Pass
Second-Order, Low-Pass
DD
© 2007 Microchip Technology Inc.
/2 or ground).
Figure 4-9
MCP60X
–
+
show low-pass, second-
has a non-inverting gain
+
–
MCP60X
8.2 nF
C
1
has an inverting
G = +1 V/V
f
P
G = -1 V/V
f
P
= 10 Hz
= 10 Hz
V
V
OUT
OUT