MCP6232-E/P Microchip Technology, MCP6232-E/P Datasheet - Page 12

• Manufacturer Part Number: MCP6232-E/P
• Description: IC OPAMP 1.8V DUAL R-R 8DIP
• Manufacturer: Microchip Technology

Specifications of MCP6232-E/P

• Slew Rate: 0.15 V/µs
• Package / Case: 8-DIP (0.300", 7.62mm)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 300kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 5000µV
• Current - Supply: 20µA
• Current - Output / Channel: 23mA
• Voltage - Supply, Single/dual (±): 1.8 V ~ 6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Number Of Channels: 2
• Common Mode Rejection Ratio (min): 61 dB
• Input Offset Voltage: 5 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: Through Hole
• Shutdown: No
• Supply Voltage (max): 6 V
• Supply Voltage (min): 1.8 V
• Technology: CMOS
• Voltage Gain Db: 110 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP6231/1R/1U/2/4
A significant amount of current can flow out of the
inputs when the common mode voltage (V
ground (V
high impedance may need to limit the usable voltage
range.
4.1.3
The input stage of the MCP6231/1R/1U/2/4 op amps
use two differential CMOS input stages in parallel. One
operates at low common mode input voltage (V
while the other operates at high V
topology, the device operates with V
above V
4.2
The output voltage range of the MCP6231/1R/1U/2/4
op amps is V
(minimum) when R
V
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. A unity-gain buffer (G = +1) is the most
sensitive to capacitive loads, but all gains show the
same general behavior.
When driving large capacitive loads with these op
amps (e.g., > 60 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 capacitive load.
FIGURE 4-4:
stabilizes large capacitive loads.
Figure 4-5
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
DS21881E-page 12
DD
V
IN
= 5.5V. Refer to
DD
Rail-to-Rail Output
Capacitive Loads
SS
and 0.3V below V
NORMAL OPERATION
gives recommended R
); see
DD
–
MCP623X
+
– 35 mV (maximum) and V
L
Figure
= 10 kΩ is connected to V
Figure 2-14
Output resistor, R
ISO
2-19. Applications that are
in
SS
Figure
R
.
L
ISO
/G
for more information.
C
N
), where G
L
4-4) improves the
ISO
N
CM
CM
= +2 V/V).
CM
. WIth this
ISO
up to 0.3V
SS
values for
) is below
N
DD
+ 35 mV
V
N
and the
OUT
/2 and
is the
N
CM
is
),
FIGURE 4-5:
for Capacitive Loads.
After selecting R
resulting frequency response peaking and step
response overshoot. Evaluation on the bench and
simulations with the MCP6231/1R/1U/2/4 SPICE
macro model are very helpful. Modify R
the response is reasonable.
4.4
With this op amp, the power supply pin (V
single-supply) should have a local 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 nearby analog parts.
4.5
An unused op amp in a quad package (MCP6234)
should be configured as shown in
circuits prevent the output from toggling and causing
crosstalk. Circuit A can use any reference voltage
between the supplies, provides a buffered DC voltage
and minimizes the supply current draw of the unused
op amp. Circuit B minimizes the number of
components, but may draw a little more supply current
for the unused op amp.
FIGURE 4-6:
V
DD
¼ MCP6234 (A)
10,000
V REF
1,000
R
R
100
10k
100
1k
1
2
10p
Supply Bypass
Unused Op Amps
10
=
Normalized Load Capacitance; C
V DD
V
DD
ISO
⋅
--------------------
R 1
for your circuit, double-check the
100p
100
Recommended R
Unused Op Amps.
R 2
+
© 2009 Microchip Technology Inc.
V
R 2
REF
G
G
G
N
N
N
= 1 V/V
= 2 V/V
≥ 4 V/V
1000
1n
¼ MCP6234 (B)
Figure
ISO
L
/G
ISO
’s value until
V
N
DD
(F)
4-6. Both
Values
10000
10n
DD
for