MCP6L4T-E/ST Microchip Technology, MCP6L4T-E/ST Datasheet - Page 12

• Manufacturer Part Number: MCP6L4T-E/ST
• Description: IC OPAMP 2.8MHZ 2.7V 14-TSSOP
• Manufacturer: Microchip Technology

Specifications of MCP6L4T-E/ST

• Slew Rate: 2.3 V/µs
• Amplifier Type: General Purpose
• Number Of Circuits: 4
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 2.8MHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 1000µV
• Current - Supply: 200µA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Op Amp Type: General Purpose
• No. Of Amplifiers: 4
• Bandwidth: 2.8MHz
• Supply Voltage Range: 2.7V To 6V
• Amplifier Case Style: TSSOP
• No. Of Pins: 14
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP6L4T-E/STTR

MCP6L1/1R/2/4
4.4
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 nearby analog parts.
4.5
An unused op amp in a quad package (e.g., MCP6L4)
should be configured as shown in
circuits prevent the output from toggling and causing
crosstalk. Circuit 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 4-4:
4.6
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 this
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 4-5
DS22135A-page 12
V
DD
¼ MCP6L4 (A)
R
R
V
1
2
Supply Bypass
Unused Op Amps
PCB Surface Leakage
REF
shows an example of this type of layout.
DD
=
V
for single supply) should have a local
V
DD
DD
⋅
------------------
R
Unused Op Amps.
1
R
+
2
R
V
12
2
REF
Ω. A 5V difference would
¼ MCP6L4 (B)
Figure
V
DD
4-4. These
FIGURE 4-5:
1.
2.
Inverting Amplifiers
pedance Gain Amplifiers (convert current to
voltage, such as photo detectors).
a)
b)
Non-inverting Gain and Unity-Gain Buffer.
a)
b)
Guard Ring
Connect the guard ring to the non-inverting
input pin (V
to the same reference voltage as the op
amp’s input (e.g., V
Connect the inverting pin (V
with a wire that does not touch the PCB sur-
face.
Connect the guard ring to the inverting input
pin (V
common mode input voltage.
input with a wire that does not touch the
PCB surface.
Connect the non-inverting pin (V
IN
–); this biases the guard ring to the
IN
Example guard ring layout.
+); this biases the guard ring
© 2009 Microchip Technology Inc.
V
(Figure
IN
– V
DD
IN
/2 or ground).
+
4-5) and Transim-
IN
–) to the input
IN
+) to the