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MAX2015 Evaluation Kit
Shutdown Mode
TRANSMITTER
POWER
AMPLIFIER
GAIN-CONTROL
INPUT
COUPLER
The EV kit is configured with the shutdown feature dis-
abled. To use the shutdown feature first remove R5.
Drive PWDN with a logic-low (0V) for normal operation
or a logic-high (VCC) to place the device in shutdown
mode. Leave the VCC power supply on and turn off the
RF power when switching the shutdown pin.
Layout Considerations
LOGARITHMIC
IN
A good PC board is an essential part of RF circuit
OUT
DETECTOR
design. The MAX2015 EV kit PC board can serve as a
SET-POINT
DAC
SET
20k Ω
guide for laying out a board using the MAX2015. Keep
the input trace carrying RF signals as short as possible
to minimize radiation and insertion loss due to the PC
board. Each power-supply node on the PC board
should have its own decoupling capacitor. This mini-
mizes supply coupling from one section of the PC board
20k Ω
MAX2015
Figure 2. MAX2015 in Controller Mode
Controller Mode
For operation in controller mode, remove R1 and set R6 to
0 Ω . Use a DAC or external precision voltage supply to
apply the set-point voltage to the VSET SMA connector.
RF_IN is connected to the RF source (power amplifier
(PA) output through a directional coupler) and VOUT is
connected to the gain-control pin of the PA (see Figure 2 ) .
V
to another. Using a star topology for the supply layout,
in which each power-supply node in the circuit has a
separate connection to the central node, can further
minimize coupling between sections of the PC board.
Modifying the EV Kit
The EV kit design includes some additional resistors (R2,
R3, R4) to provide for possible power-supply filtering and
for high power-supply voltage operation. For operation
where V CC = 2.7V to 3.6V (TP1), set R4 = 0 Ω . For opera-
tion where V CC = 4.75V to 5.25V, set R4 = 75 Ω ±1%
(100ppm/°C max) and connect PWDN to GND
(required). The output load for VOUT can be changed by
including the values for R7 and C8.
R2
1
V CC
OUT
8
J2
SMA
VOUT
V
C6
C5
R1
R7
C8
TP1
V CC *
R4
J1
SMA
C1
2
INHI
MAX2015
SET
7
C7
RF_IN
TP2
GND
C2
3
INLO
GND
6
R6
J3
SMA
V
VSET
R3
4
V CC
PWDN
5
J4
SMA
PWDN
C4
C3
R5
*V CC = 2.7V TO 3.6V WITH R4 = 0 Ω
V CC = 4.75V TO 5.25V WITH R4 = 75 Ω
Figure 3. MAX2015 EV Kit Schematic
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