MCP654 MICROCHIP [Microchip Technology], MCP654 Datasheet - Page 29

• Manufacturer Part Number: MCP654
• Description: 50 MHz, 6 mA Op Amps with mCal
• Manufacturer: MICROCHIP [Microchip Technology]

4.7
4.7.1
Figure 4-13
(1 + R
cuit current makes it possible to drive significant loads.
The calibrated input offset voltage supports accurate
response at high gains. R
to R
offset.
FIGURE 4-13:
4.7.2
Figure 4-14
the MCP651 op amp, in a photo detector circuit. The
photo detector is a capacitive current source. The op
amp’s input common mode capacitance (5 pF, typical)
acts in parallel with C
produce 10 mV at V
its the transimpedance bandwidth to about 1.1 MHz.
R
SMD) acts in parallel with C
FIGURE 4-14:
for an Optical Detector.
© 2011 Microchip Technology Inc.
F
’s parasitic capacitance (e.g., 0.2 pF for a 0805
100 nA
1
||R
2
/R
V
2
DD
, in order to minimize the bias current induced
Typical Applications
I
1
V
D
). The MCP651/2/4/5/9 op amp’s short cir-
IN
/2
POWER DRIVER WITH HIGH GAIN
OPTICAL DETECTOR AMPLIFIER
shows a transimpedance amplifier, using
shows a power driver with high gain
Detector
Photo
R
R
1
3
OUT
C
30pF
D
Power Driver.
D
Transimpedance Amplifier
. C
. R
MCP65X
3
F
F
R
should be small, and equal
F
stabilizes the gain and lim-
V
.
2
provides enough gain to
DD
/2
100 kΩ
1.5 pF
C
R
MCP651
F
F
R
L
V
OUT
V
OUT
4.7.3
Figure 4-15
a H-bridge driver. The load could be a speaker or a DC
motor.
FIGURE 4-15:
This circuit automatically makes the noise gains (G
equal, when the gains are set properly, so that the fre-
quency responses match well (in magnitude and in
phase).
R
G
EQUATION 4-11:
Equation 4-12
differential mode output voltages.
EQUATION 4-12:
GB
DM
so that both op amps have the same DC gains;
needs to be selected first.
V
DD
Equation 4-11
V
IN
/2
H-BRIDGE DRIVER
V
-------------------------- -
V
shows the MCP652 dual op amp used as
G
R
R
OT
OT
MCP651/2/4/5/9
GT
GB
gives the resulting common mode and
DM
+
–
2
V
=
V
≡
=
R
R
OB
OB
R
--------------------------------
V
GB
-------------------------------- -
(
GT
------------------ -
G
V
F
IN
G
shows how to calculate R
H-Bridge Driver.
DM
OT
=
R
=
DM
–
F
G
–
V
R
V
---------- -
⁄
⁄
2
DD
DM
DD
F
2
V
2
OB
) 1
⎛
⎝
⁄
–
R
R
V
2
IN
½ MCP652
½ MCP652
F
F
≥
2 V/V
–
DS22146B-page 29
V
---------- -
DD
2
⎞
⎠
R
L
V
V
OT
OB
GT
and
N
)