MCP6051-E/SN Microchip Technology, MCP6051-E/SN Datasheet - Page 16

• Manufacturer Part Number: MCP6051-E/SN
• Description: IC OPAMP R-R 1.8V 30UA 8-SOIC
• Manufacturer: Microchip Technology

Specifications of MCP6051-E/SN

• Slew Rate: 0.15 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: 385kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 150µV
• Current - Supply: 30µA
• Current - Output / Channel: 26mA
• Voltage - Supply, Single/dual (±): 1.8 V ~ 6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Channels: 1
• Common Mode Rejection Ratio (min): 72 dB
• Input Offset Voltage: 0.15 mV
• Input Bias Current (max): 100 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): 6 V
• Supply Voltage (min): 1.8 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

MCP6051/2/4
4.3
Driving large capacitive loads can cause stability
problems for voltage feedback op amps. As the load
capacitance increases, the feedback loop’s phase
margin decreases and the closed-loop bandwidth is
reduced. This produces gain peaking in the frequency
response, with overshoot and ringing in the step
response. While a unity-gain buffer (G = +1) is the most
sensitive to capacitive loads, all gains show the same
general behavior.
When driving large capacitive loads with these op
amps (e.g., > 100 pF when G = +1), a small series
resistor at the output (R
feedback loop’s phase margin (stability) by making the
output load resistive at higher frequencies. The
bandwidth will be generally lower than the bandwidth
with no capacitance load.
FIGURE 4-3:
Stabilizes Large Capacitive Loads.
Figure 4-4
different capacitive loads and gains. The x-axis is the
normalized load capacitance (C
circuit's noise gain. For non-inverting gains, G
Signal Gain are equal. For inverting gains, G
1+|Signal Gain| (e.g., -1 V/V gives G
FIGURE 4-4:
for Capacitive Loads.
DS22182A-page 16
V
IN
10000
1000
100
10
Capacitive Loads
1
1.E-11
10p
gives recommended R
–
+
MCP605X
Normalized Load Capacitance; C
1.E-10
100p
Output Resistor, R
Recommended R
ISO
1.E-09
G
1 V/V
2 V/V
≥ 5 V/V
1n
N
in
:
Figure
R
L
ISO
/G
1.E-08
10n
C
N
), where G
N
L
4-3) improves the
ISO
V
R
= +2 V/V).
DD
L
= 100 kΩ
0.1µ
= 6.0 V
1.E-07
L
ISO
/G
values for
ISO
N
N
(F)
Values
V
and the
N
OUT
1µ
1.E-06
is the
N
is
After selecting R
resulting frequency response peaking and step
response overshoot. Modify R
response is reasonable. Bench evaluation and
simulations with the MCP6051/2/4 SPICE macro
model are very helpful.
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 can use 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 analog parts.
4.5
An unused op amp in a quad package (MCP6054)
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:
V
DD
¼ MCP6054 (A)
V REF
R
R
1
2
Supply Bypass
Unused Op Amps
=
DD
V DD
V
DD
for single-supply) should have a local
ISO
×
for your circuit, double-check the
--------------------
R 1
Unused Op Amps.
R 2
© 2009 Microchip Technology Inc.
+
V
R 2
REF
ISO
¼ MCP6054 (B)
’s value until the
Figure
V
4-5. These
DD