MCP6291-E/SN Microchip Technology, MCP6291-E/SN Datasheet - Page 13

• Manufacturer Part Number: MCP6291-E/SN
• Description: IC OPAMP 2.4V SNGL R-R 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP6291-E/SN

• Slew Rate: 7 V/µs
• Package / Case: 8-SOIC (3.9mm Width)
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 10MHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 3000µV
• Current - Supply: 1mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 2.4 V ~ 6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Channels: 1
• Common Mode Rejection Ratio (min): 70 dB
• Input Offset Voltage: 3 mV
• Input Bias Current (max): 1 pA
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Shutdown: No
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.4 V
• Technology: CMOS
• Voltage Gain Db: 110 dB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: PIC16F690DM-PCTLHS - BOARD DEMO PICTAIL HUMIDITY SNSR
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FIGURE 4-6:
for Inverting Gain.
1.
2.
 2004 Microchip Technology Inc.
For
Amplifiers (convert current to voltage, such as
photo detectors):
a.
b.
Non-inverting Gain and Unity-Gain Buffer:
a.
b.
Connect the guard ring to the non-inverting
input pin (V
to the same reference voltage as the op
amp (e.g., V
Connect the inverting pin (V
with a wire that does not touch the PCB
surface.
Connect the non-inverting pin (V
input with a wire that does not touch the
PCB surface.
Connect the guard ring to the inverting input
pin (V
common mode input voltage.
Inverting
IN
–). This biases the guard ring to the
V
IN
IN
DD
Guard Ring
Gain
+). This biases the guard ring
Example Guard Ring Layout
–
/2 or ground).
and
V
IN
+
Transimpedance
IN
–) to the input
IN
V
SS
+) to the
4.8
4.8.1
The MCP6291/2/3/4/5 op amp can be used in active-
filter applications. Figure 4-7 shows an inverting, third-
order, multiple feedback low-pass filter that can be
used as an anti-aliasing filter.
FIGURE 4-7:
Pass Filter.
This filter, and others, can be designed using
Microchip’s FilterLab
our web site (www.microchip.com).
4.8.2
Figure 4-8 shows a photodiode biased in the photovol-
taic mode for high precision. The resistor R converts
the diode current I
is used to limit the bandwidth or to stabilize the circuit
against the diode’s capacitance (it is not always
needed).
FIGURE 4-8:
V
light
IN
V
DD
/2
V
Application Circuits
R
DD
C
I
1
D
MCP6291/2/3/4/5
MULTIPLE FEEDBACK LOW-PASS
FILTER
PHOTODIODE AMPLIFIER
1
/2
D
to the voltage V
R
®
MCP6291
3
Multiple Feedback Low-
Photodiode Amplifier.
software, which is available on
MCP6291
R
C
2
3
C
R
OUT
DS21812D-page 13
R
. The capacitor
C
4
4
V
OUT
V
OUT