MAX9633EVKIT+ Maxim Integrated Products, MAX9633EVKIT+ Datasheet - Page 3

• Manufacturer Part Number: MAX9633EVKIT+
• Description: Amplifier Modules & Development Tools MAX9633 Eval Kit
• Manufacturer: Maxim Integrated Products

and INB- pads. Install a shunt on JU3 to ground the INB-
input in this configuration. The output voltage is given by
the following equation:
To configure op-amp U1-A as a differential amplifier,
replace R1–R4 with appropriate resistors and install a
shunt on jumper JU1. Make sure R1 = R4 and R2 = R3.
The CMRR of the differential amplifier is determined by
the matching of the resistor ratios R4/R2 and R1/R3:
where:
To configure op-amp U1-B as a differential amplifier,
replace R6–R9 with appropriate resistors and install a
shunt on jumper JU3. Make sure R6 = R9 and R7 = R8.
The CMRR of the differential amplifier is determined by
the matching of the resistor ratios R9/R7 and R6/R8:
where:
V
V
V
OUT
_______________________________________________________________________________________
OUT
OUT
GAIN
GAIN
=
=
=
GAIN INP - INN
GAIN INP - INN



1
=
=
+
R9
R7
R4
R2
R9
R7
(
(
=
=



R6
R8
R3
(
R1
Differential Amplifier
V
IN
)
)
)
MAX9633 Evaluation Kit
To configure op-amp U1-A as a transimpedance
amplifier (TIA), replace R2 with a 0I resistor and install a
shunt on jumper JU2. The output voltage of the TIA is the
input current multiplied by the feedback resistor:
where R4 is installed as a 100I resistor, I
the input current source applied at the INA- pad, I
the input bias current, and V
of the op amp. Use capacitor C6 (and C5, if applicable) to
stabilize the op amp by rolling off high-frequency gain
due to a large cable capacitance.
To configure op-amp U1-B as a TIA, replace R7 with a
0I resistor and install a shunt on jumper JU4. The output
voltage of the TIA is the input current multiplied by the
feedback resistor:
where R9 is installed as a 100I resistor, I
the input current source applied at the INB- pad, I
the input bias current, and V
of the op amp. Use capacitor C9 (and C8, if applicable) to
stabilize the op amp by rolling off high-frequency gain
due to a large cable capacitance.
Some applications require driving large capacitive loads.
To improve the stability of the amplifier in such cases,
replace R5 (R10) with a suitable resistor value to improve
amplifier phase margin. The R5/C7 (R10/C10) filter can
also be used as an anti-alias filter, or to limit amplifier
output noise by reducing its output bandwidth.
V
V
OUT
OUT
=
=
(I
(I
IN
IN
+
+
Transimpedance Application
I
I
BIAS
BIAS
OS
OS
is the input offset voltage
is the input offset voltage
) R4 V
) R9 V
×
×
Capacitive Loads
+
+
OS
OS
IN
IN
is defined as
is defined as
BIAS
BIAS
is
is
3