MCP6142-E/MS Microchip Technology, MCP6142-E/MS Datasheet - Page 18

• Manufacturer Part Number: MCP6142-E/MS
• Description: IC OPAMP 1.4V DUAL R-R 8MSOP
• Manufacturer: Microchip Technology

Specifications of MCP6142-E/MS

• Slew Rate: 0.003 V/µs
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 100kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 3000µV
• Current - Supply: 0.6µA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 1.4 V ~ 6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Op Amp Type: Rail To Rail
• No. Of Amplifiers: 2
• Bandwidth: 100kHz
• Supply Voltage Range: 1.4V To 6V
• Amplifier Case Style: MSOP
• No. Of Pins: 8
• Number Of Channels: 2
• Voltage Gain Db: 115 dB
• Common Mode Rejection Ratio (min): 60 dB
• Input Offset Voltage: 3 mV
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details

MCP6141/2/3/4
4.6
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 can use a bulk
capacitor (i.e., 1 µF or larger) within 100 mm to provide
large, slow currents. This bulk capacitor is not required
for most applications and can be shared with other
nearby analog parts.
4.7
An unused op amp in a quad package (MCP6144)
should be configured as shown in
circuits prevent the output from toggling and causing
crosstalk.
Circuits A sets the op amp near 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 4-8:
4.8
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
cause 5 pA of current to flow, which is greater than the
MCP6141/2/3/4 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
DS21668D-page 18
V
DD
R
R
4-9.
1
R
2
Supply Bypass
Unused Op Amps
¼ MCP6144 (A)
PCB Surface Leakage
V REF
DD
10R
V
DD
=
for single supply) should have a local
V DD
Unused Op Amps.
⋅
V
--------------------
R 1
REF
12
R 2
+
Ω. A 5V difference would
R 2
Figure
¼ MCP6144 (B)
V
4-8. These
DD
FIGURE 4-9:
for Inverting Gain.
1.
2.
Non-inverting Gain and Unity Gain Buffer:
a)
b)
Inverting Gain and Transimpedance Gain
(convert current to voltage, such as photo
detectors) amplifiers:
a)
b)
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.
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.
Guard Ring
IN
–). This biases the guard ring to the
IN
DD
+). This biases the guard ring
Example Guard Ring Layout
© 2009 Microchip Technology Inc.
/2 or ground).
V
IN
– V
IN
+
IN
–) to the input
IN
+) to the