MCP6041T-I/OT Microchip Technology, MCP6041T-I/OT Datasheet - Page 14

• Manufacturer Part Number: MCP6041T-I/OT
• Description: IC OPAMP 1UA 1.4V SNGLR-R SOT235
• Manufacturer: Microchip Technology

Specifications of MCP6041T-I/OT

• Slew Rate: 0.003 V/µs
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 14kHz
• 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 ~ 85°C
• Mounting Type: Surface Mount
• Number Of Channels: 1
• Common Mode Rejection Ratio (min): 60 dB
• Input Offset Voltage: 3 mV
• Input Bias Current (max): 1 pA
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Shutdown: No
• Supply Voltage (max): 6 V
• Supply Voltage (min): 1.4 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
• Other names: MCP6041T-I/OT; MCP6041T-I/OTTR

MCP6041/2/3/4
4.5
The MCP6043 is a single op amp with Chip Select
(CS). When CS is pulled high, the supply current drops
to 50 nA (typical) and flows through the CS pin to V
When this happens, the amplifier output is put into a
high impedance state. By pulling CS low, the amplifier
is enabled. If the CS pin is left floating, the amplifier
may not operate properly.
voltage and supply current response to a CS pulse.
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 nearby
analog parts.
4.7
An unused op amp in a quad package (MCP6044)
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 4-5:
DS21669C-page 14
V
DD
¼ MCP6044 (A)
R
R
V
REF
1
2
MCP6043 Chip Select
Supply Bypass
Unused Op Amps
=
DD
V
V
DD
DD
for single supply) should have a local
⋅
------------------
R
1
R
Unused Op Amps.
+
2
V
R
2
Figure 1-1
REF
Figure
¼ MCP6044 (B)
shows the output
V
4-5. These
DD
SS
.
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
MCP6041/2/3/4 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.
Figure 4-6
FIGURE 4-6:
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)
PCB Surface Leakage
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
shows an example of this type of layout.
IN
–). This biases the guard ring to the
IN
DD
+). This biases the guard ring
Example Guard Ring Layout
© 2008 Microchip Technology Inc.
/2 or ground).
V
12
IN
– V
Ω. A 5V difference would
IN
+
IN
–) to the input
IN
+) to the