Datasheet

Evaluates: MAX4208/MAX4209
MAX4208/MAX4209 IC data sheet for application
details. Verify that the selected resistor is rated for the
appropriate current and power levels.
For high-power applications, use the IN+ and IN- PCB
pads as sense connections to an off-board current-
sense resistor.
Differential Input Filter
The MAX4208 EV kit features an optional balanced-dif-
ferential resistor-capacitor filter across the MAX4208
IN+ and IN- input pins. Use the surface-mount 0603
PCB pads for installing resistors R5, R6, and capacitor
C7, which form the filter. Before installing resistors R5
and R6, cut open the shorting PCB trace located at the
respective pads.
Gain Setting
The MAX4208 EV kit gain is configured to 148V/V by
resistors R1 and R2. Replacing these resistors with
high-precision, surface-mount 0805 resistors can
change the gain. Tolerance of ±0.1% or better is rec-
ommended for optimum performance. Use the follow-
ing equation to select values for resistors R1 and R2:
R2 = R1 x (Gain - 1)
where R1 ≤ 1kΩ and the sum of R1 + R2 is 10kΩ ≤ (R1 +
R2) ≤ 500kΩ.
Evaluating the MAX4209
The MAX4208 EV kit can be used to evaluate the fixed-
gain MAX4209 IC in the 8-pin µMAX package by replac-
ing the MAX4208 IC U1 and removing resistors R1 and
R2. The MAX4209 IC features fixed gains of 10V/V,
100V/V, or 1000V/V. See the Part Selection Table for
ordering information.
The MAX4209 EV kit is also available separately.
MAX4208 Evaluation Kit
4 _______________________________________________________________________________________
C2
0.1μF
C8
1000pF
R2
147kΩ
0.1%
R1
1kΩ
0.1%
OUT
GND
REF
JU3
C6
OPEN
5
6
7
8
V
DD
OUT
FB
REF
REFIN/MODE
IN-
IN+
V
SS
4
3
2
1
C4
0.1μF
C7
OPEN
C5
0.1μF
C3
10μF
JU2
GND
VSS
VSS
R6
SHORT
R5
SHORT
IN+
IN-
R7
OPEN
REFIN/MODE
GND
1
2
3
4
JU1
R4
4.99kΩ
1%
R3
4.99kΩ
1%
VSS
C1
10μF
MAX4208
U1
VDD
GND
Figure 1. MAX4208 EV Kit Schematic