MCP607-I/SN Microchip Technology, MCP607-I/SN Datasheet - Page 18

• Manufacturer Part Number: MCP607-I/SN
• Description: IC OPAMP 2.5V DUAL R-R 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP607-I/SN

• Slew Rate: 0.08 V/µs
• Package / Case: 8-SOIC (3.9mm Width)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 155kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 250µV
• Current - Supply: 18.7µA
• Current - Output / Channel: 17mA
• Voltage - Supply, Single/dual (±): 2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Number Of Channels: 2
• Common Mode Rejection Ratio (min): 75 dB
• Input Offset Voltage: 0.25 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): 2.5 V
• Technology: CMOS
• Voltage Gain Db: 121 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP606/7/8/9
4.8.2
Sensors that produce an output current and have high
output
transimpedance
amplifier converts the current into voltage. Photodiodes
are one sensor that produce an output current.
The key op amp characteristics that are needed for
these circuits are: low input offset voltage, low input
bias current, high input impedance and an input
common mode range that includes ground. The low
input offset voltage and low input bias current support
a very low voltage drop across the photodiode; this
gives the best photodiode linearity. Since the
photodiode is biased at ground, the op amp’s input
needs to function well both above and below ground.
4.8.2.1
Figure 4-9
photodiode (D
across D
sensing.
As light impinges on D
a current to flow in the reverse bias direction of D
op amp’s negative feedback forces the voltage across
the D
into voltage. Capacitor C
helps
capacitance is large.
FIGURE 4-9:
mode) and Transimpedance Amplifier.
4.8.2.2
Figure 4-9
photodiode (D
(D
applications.
As light impinges on D
a current to flow in the reverse bias direction of D
Placing a negative bias on D
junction capacitance, which allows the circuit to
DS11177F-page 18
1
Light
is reverse biased), which is used for high-speed
1
to be nearly 0V. Resistor R
stabilize
impedance
1
), which is used for precision photodiode
I
shows a transimpedance amplifier with a
D1
shows a transimpedance amplifier with a
PHOTODIODE AMPLIFIERS
Photo-Voltaic Mode
Photo-Conductive Mode
1
1
) biased in the Photo-voltaic mode (0V
) biased in the Photo-conductive mode
the
D
amplifier.
V
1
OUT
Photodiode (in Photo-voltaic
1
1
can
, charge is generated, causing
circuit
, charge is generated, causing
MCP606
=
2
limits the bandwidth and
I
V
1
D1
be
C
R
DD
significantly reduces its
2
2
The
R
when
2
2
converts the current
connected
transimpedance
D
1
’s
V
junction
OUT
1
to
. The
1
a
.
operate at a much higher speed. This reverse bias also
increases the dark current and current noise, however.
Resistor R
C
when D
FIGURE 4-10:
conductive mode) and Transimpedance
Amplifier.
4.8.3
The two op amp instrumentation amplifier shown in
Figure 4-11
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 4-11:
Instrumentation Amplifier.
The key specifications that make the MCP606/7/8/9
family appropriate for this application circuit are low
input bias current, low offset voltage and high
common-mode rejection.
V
2
REF
limits the bandwidth and helps stabilize the circuit
V
V
Light
2
1
1
V OUT
’s junction capacitance is large.
2
I
R
D1
TWO OP AMP INSTRUMENTATION
AMPLIFIER
converts the current into voltage. Capacitor
serves the function of taking the difference
1
VB
=
(
V 1 V 2
D
V
R
1
–
MCP607
OUT
2
Photodiode (in Photo-
Two Op Amp
R
© 2009 Microchip Technology Inc.
V
) 1
½
G
⎛
⎜
⎝
B
MCP606
=
<
+
I
R
0
V
R 1
------
R 2
D1
DD
C
R
DD
2
2
2
R
/2) in a single-supply
+
2
2R 1
--------- -
R G
⎞
⎟
⎠
R
MCP607
+
1
V REF
½
V
OUT
V
OUT
REF
)