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MAX4209 Evaluation Kit
V REFIN/MODE = VDD x ?
? R3 + R4 ?
REFIN/MODE Operation Modes
The EV kit jumper JU1 configures the MAX4209 for direct
reference, buffered reference, or shutdown mode. The
reference voltage at REF sets the output voltage DC sig-
nal, OUT, when the differential input signal V IN+ - V IN-
equals zero. In direct-reference-mode operation, con-
nect a user reference voltage directly to the REF PCB
pad. In buffered-reference-mode operation, connect a
user reference voltage to the REFIN/MODE input PCB
pad or use the resistor-divider network R3 and R4 to
provide a reference voltage for REFIN/MODE, scaled
from VDD. The network is configured to scale the volt-
age at REFIN/MODE to one-half of VDD. Replace resis-
tors R3 and R4 to modify the voltage applied to
REFIN/MODE using the following equation:
? R4 ?
?
where VDD is the input supply voltage to the EV kit.
REF Input
The EV kit’s jumper JU3 must be configured properly
for appropriate reference-voltage operation. In direct
reference mode, install a shunt on jumper JU3 to con-
nect REF to the on-board ground (GND), or remove the
shunt to connect a user reference voltage to the REF
input PCB pad. For either buffered-reference mode,
REF must not be connected to a reference voltage;
thus, the shunt on jumper JU3 must not be installed.
See Table 2 for jumper JU3 configurations.
Optional capacitor C6 can be used for reference-volt-
age stability/filtering. Choose an appropriate value as
needed.
On-Board Current Sensing
The MAX4209 EV kit can be configured for on-board
current sensing by installing a surface-mount 1206
sense resistor at R7, located between the IN+ and IN-
PCB pads. Use the following equation to select the
value for resistor R7:
In buffered-reference mode, the MAX4209 internally
buffers the REFIN/MODE voltage onto REF.
R7 =
30mV
I IN
Note: Do not connect an external source to the REF PCB
pad in buffered-reference mode. See Table 2 for jumper
JU1 configurations.
where I IN is the maximum current flowing across resis-
tor R7 and 30mV is a suggested sense voltage. 30mV x
100V/V gives a 3V output swing. Refer to the
Table 2. Jumpers JU1 and JU3 Configurations
MODE
JU1
SHUNT
POSITION
REFIN/MODE
PIN
JU3
SHUNT
POSITION
REF PIN
EV KIT FUNCTION
Installed
Connected
to GND
JU1 disables the internal REF buffer. JU3 sets
the REF voltage to GND.
Direct-
reference-mode
operation
1-2
Connected to
VSS
Not
Connected
to user
JU1 disables the internal REF buffer. JU3 allows
the user to set the REF voltage directly. Apply a
installed
reference
voltage
user reference voltage to the REF PCB pad in
the 0V and VDD - 1.6V range.
Shutdown mode
Buffered-
reference-mode
operation (on-
board reference)
Buffered-
reference-mode
operation (user
reference)
1-3
1-4
Not
installed
Connected to
VDD
Connected to
VDD / 2
Connected to
user
reference
voltage
—
Not
installed
Not
installed
—
Not
connected
Not
connected
Entire IC is in shutdown. I CC < 5μA.
The IC buffers the on-board VDD / 2 onto REF.
Do not install JU3 or connect an external source
to the REF PCB pad.
The IC buffers a user reference voltage onto REF.
Apply a user reference voltage to the
REFIN/MODE PCB pad in the range of VSS +
200mV and VDD - 1.6V. Do not install JU3 or
connect an external source to the REF PCB pad.
_______________________________________________________________________________________
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