Datasheet
MAX9934T Evaluation Kit
Evaluates: MAX9934
2 ______________________________________________________________________________________
Quick Start
Required Equipment
U MAX9934T EV kit
U +2.5V to +3.6V, 100mA DC power supply for VCC
U +5.5V, 2A DC power supply
U 2A electronic load
U One digital voltmeter (DVM) with 10M
I input imped-
ance
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
1) Verify that jumpers JU1, JU2, and JU3 shunts are
in-stalled as follows:
JU1: Installed (OUT_REF PCB pad connected to
GND PCB pad)
JU2: Not installed (U1 output enabled)
JU3: Installed (U2 output disabled; high impedance)
2) Set the +2.5V to +3.6V, 100mA DC power-supply
voltage to +3.3V and disable the output.
3) Set the +5.5V, 2A DC power-supply voltage to +5V,
the current limit above 1A, and disable the output.
4) Set the electronic load to 1A and disable the output.
5) Connect the low-power DC power-supply positive
terminal to the VCC PCB pad and the negative ter-
minal to the nearby GND PCB pad.
6) Connect the 2A DC power-supply positive terminal
to the I_RS+ PCB pad and the negative terminal to
the GND PCB pad.
7) Connect the 2A electronic load positive terminal to
the I_RS- PCB pad and the negative terminal to the
GND PCB pad.
8) Set the DVM to measure voltage.
9) Connect the DVM positive terminal to the OUT PCB
pad and the negative terminal to the OUT_REF PCB
pad.
10) Enable the power supplies and the electronic load.
Any power sequence can be used without damage
to U1 or U2.
11) Verify that the DVM measures +2.5V.
Detailed Description of Hardware
The MAX9934T EV kit demonstrates the MAX9934T low-
voltage, precision, current-sense amplifier in a tiny 1mm
x 1.5mm, 3 x 2-bump UCSP package (U1) and an 8-pin
FMAX package (U2). The EV kit can also be used to
evaluate the MAX9934F current-sense amplifier. Contact
the factory to obtain free samples. See the Evaluating the
MAX9934F section for more information.
The device’s precision inputs measure very small
sense voltages up to Q10mV full scale. The EV kit
features a precision, on-board, four-terminal surface-
mount sense resistor, R1 (10mI Q0.1%, Q15ppm/NC).
This enables measurement of bidirectional currents up to
1A connected across the EV kit’s I_RS+ and I_RS- PCB
pads. The input common-mode range is -0.1V to +5.5V
independent of VCC. The EV kit operates from a +2.5V
to +3.6V, 100mA DC power supply connected across the
VCC and GND PCB pads.
The device’s 25FA/mV fixed-gain output current cre-
ates an output voltage across the output-load resistor,
R2 (10kI Q0.1%), achieving a 250V/V gain. R2 can be
replaced with an appropriate surface-mount 0603 resis-
tor to achieve different output gains. The EV kit’s output
voltage can be measured across the OUT and OUT_REF
PCB pads. Connect a 1.65V reference voltage across
the OUT_REF and GND PCB pads. The device’s CS pin
allows users to multiplex several MAX9934T parts.
Surface-mount 0603 capacitors C5 (installed) and C6
(not installed) provide optional input filters.
Component Suppliers
Note: Indicate that you are using the MAX9934_ when contacting these component suppliers.
SUPPLIER PHONE WEBSITE
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Panasonic Corp. 800-344-2112 www.panasonic.com
Vishay 402-563-6866 www.vishay.com