MCP618-I/P Microchip Technology, MCP618-I/P Datasheet - Page 15

• Manufacturer Part Number: MCP618-I/P
• Description: IC OPAMP 2.3V R-R W/CS 8DIP
• Manufacturer: Microchip Technology

Specifications of MCP618-I/P

• Slew Rate: 0.08 V/µs
• Operating Temperature: -40°C ~ 85°C
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 190kHz
• Current - Input Bias: 15nA
• Voltage - Input Offset: 150µV
• Current - Supply: 19µA
• Current - Output / Channel: 17mA
• Voltage - Supply, Single/dual (±): 2.3 V ~ 5.5 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Op Amp Type: General Purpose
• No. Of Amplifiers: 1
• Bandwidth: 190kHz
• Supply Voltage Range: 2.3V To 5.5V
• Amplifier Case Style: DIP
• No. Of Pins: 8
• Number Of Channels: 1
• Voltage Gain Db: 120 dB
• Common Mode Rejection Ratio (min): 80 dB
• Input Offset Voltage: 0.15 mV
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details

4.9
4.9.1
The MCP616/7/8/9 op amps are well suited to
amplifying small signals produced by low-impedance
sources/sensors. The low offset voltage, low offset
current and low noise fit well in this role. Figure 4-8
shows a typical pre-amplifier connected to a low-
impedance source (V
FIGURE 4-8:
For the best noise and offset performance, the source
resistance R
resistances at the inputs are equal to minimize the
offset voltage caused by the input bias currents
(Section 4.2 “DC Offsets”). In this circuit, the DC gain
is 10 V/V, which will give a typical bandwidth of 19 kHz.
4.9.2
The two-op amp instrumentation amplifier shown in
Figure 4-9 serves the function of taking the difference
of two input voltages, level-shifting it and gaining it to
the output. This configuration is best suited for higher
gains (i.e., gain > 3 V/V). The reference voltage (V
is typically at mid-supply (V
environment.
FIGURE 4-9:
Instrumentation Amplifier.
The key specifications that make the MCP616/7/8/9
family appropriate for this application circuit are low
input bias current, low offset voltage and high common-
mode rejection.
© 2005 Microchip Technology Inc.
V
V
REF
S
V
V
2
1
V
V OUT
Application Circuits
10 k
DD
R
R
HIGH GAIN PRE-AMPLIFIER
/2
TWO OP AMP INSTRUMENTATION
AMPLIFIER
S
1
S
=
needs to be less than 15 k . The DC
11.0 k
V 1 V 2
R
R
–
MCP617
G
S
2
High Gain Pre-amplifier.
Two-Op Amp
and R
R
½
G
⎛
⎜
⎝
1
+
R
R 1
------
R 2
S
DD
MCP616
).
2
/2) in a single-supply
+
100 k
2R 1
--------- -
R G
R
F
⎞
⎟
⎠
R
MCP617
+
1
V
½
REF
V
V
OUT
OUT
REF
)
4.9.3
A classic, three-op amp instrumentation amplifier is
illustrated in Figure 4-10. The two-input op amps
provide differential signal gain and a common mode
gain of +1. The output op amp is a difference amplifier,
which converts its input signal from differential to a
single-ended output; it rejects common mode signals at
its input. The gain of this circuit is simply adjusted with
one resistor (R
typically referenced to mid-supply (V
supply applications.
FIGURE 4-10:
Instrumentation Amplifier.
4.9.4
In Figure 4-11, the MCP616 op amp, R
a high gain to the input signal (V
offset voltage makes this an accurate circuit.
The MCP606 is configured as a unity-gain buffer. It
isolates the MCP616’s output from the load, increasing
the high gain stage’s precision. Since the MCP606 has
a higher output current, and the two amplifiers are
housed in separate packages, there is minimal change
in the MCP616’s offset voltage due to loading effect.
FIGURE 4-11:
Load Isolation.
V
V
V
IN
2
1
V
OUT
THREE OP AMP
INSTRUMENTATION AMPLIFIER
PRECISION GAIN WITH GOOD
LOAD ISOLATION
R
1
R
=
V OUT
G
G
R
R
MCP617
MCP617
). The reference voltage (V
2
2
V
MCP616/7/8/9
1
½
½
–
R
=
MCP616
V
Three-Op Amp
Precision Gain with Good
2
2
V
R
R
⎛
⎜
⎝
IN
1
3
3
+
1
2R
---------
R
+
G
R
2
IN
2
⎞ R
⎟
⎠
). The MCP616’s low
R
R
⎛
⎜
⎝
MCP616
----- -
R
R
MCP606
4
4
4
3
DS21613B-page 15
1
⎞
⎟
⎠
1
DD
+
and R
V
/2) in single-
REF
V
V
V
2
OUT
REF
OUT
provide
REF
) is