MAX4208EVKIT+ Maxim Integrated Products, MAX4208EVKIT+ Datasheet - Page 3

• Manufacturer Part Number: MAX4208EVKIT+
• Description: KIT EVAL FOR MAX4208
• Manufacturer: Maxim Integrated Products

Specifications of MAX4208EVKIT+

• Channels Per Ic: 1 - Single
• Amplifier Type: Instrumentation
• Output Type: Single-Ended, Rail-to-Rail
• Slew Rate: 0.08 V/µs
• Current - Output / Channel: 25mA
• Operating Temperature: -40°C ~ 125°C
• Current - Supply (main Ic): 1.4mA
• Voltage - Supply, Single/dual (±): 2.85 V ~ 5.5 V, ±1.425 V ~ 2.25 V
• Board Type: Fully Populated
• Utilized Ic / Part: MAX4208, MAX4209
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

The EV kit jumper JU1 configures the MAX4208 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
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:
where VDD is the input supply voltage to the EV kit.
In buffered-reference mode, the MAX4208 internally
buffers the REFIN/MODE voltage onto REF.
Note: Do not connect an external source to the REF PCB
pad in buffered-reference mode. See Table 2 for jumper
JU1 configurations.
Table 2. Jumpers JU1 and JU3 Configurations
Direct-reference-mode
operation
Shutdown mode
Buffered-reference-
mode operation
(on-board reference)
Buffered-reference-
mode operation (user
reference)
MODE
V
REFIN/MODE
REFIN/MODE Operation Modes
_______________________________________________________________________________________
=
JU1 SHUNT
Not installed
POSITION
VDD x
1-2
1-3
1-4
⎛
⎜
⎝
R3
R4
user reference
+
REFIN/MODE
Connected to
Connected to
Connected to
Connected to
R4
VDD / 2
voltage
VDD
VSS
PIN
⎞
⎟
⎠
IN+
- V
JU3 SHUNT
Not installed
Not installed
Not installed
IN-
POSITION
Installed
—
MAX4208 Evaluation Kit
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.
The MAX4208 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:
where I
tor R7 and 30mV is a suggested sense voltage. 30mV x
148V/V gives a 4.4V output swing. Refer to the
Not connected
Not connected
user reference
Connected to
Connected to
IN
REF PIN
voltage
GND
is the maximum current flowing across resis-
—
JU1 disables the internal REF buffer.
JU3 sets the REF voltage to GND.
JU1 disables the internal REF buffer.
JU3 allows the user to set the REF
voltage directly. Apply a user reference
voltage to the REF PCB pad in the 0V
and VDD - 1.6V range.
Entire IC is in shutdown. I
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.
R7
On-Board Current Sensing
=
30mV
I
IN
EV KIT FUNCTION
CC
REF Input
< 5µA.
3