CC2590 Datasheet, PDF (11/18 Pages) Texas Instruments – 2.4-GHz RF Front End, 14-dBm output power

CC2590
www.ti.com ........................................................................................................................................................................................ SWRS080 – SEPTEMBER 2008
Connecting CC2590 to a CC2520 Device
Table 5. Control Logic for Connecting CC2590 to a CC2520 Device
PAEN
0
0
0
1
1
EN
RXTX
HGM
0
NC
X
1
NC
0
1
NC
1
0
NC
X
1
NC
X
MODE OF OPERATION
Power Down
RX Low Gain Mode
RX High Gain Mode
TX
Not allowed
VDD
C101/C102
VDD
C161
VDD
C131/C132
= PCB trace inductor
CC2520
RF_P ^RRFF__PP
RF_P
C112
RXTX ^RRXXTTXX
NC
C1
L111
ANT
CC2590
RF_N ^RRFF__NN
RF_N
L112
C113
C111
PAEN
GPIO5
EN
GPIO4
HGM
GPIO3
R151
Alternatively to
Alternatively
VDD/GND/MCU
from MCU
Figure 13. CC2590 + CC2520 Application Circuit
PCB Layout Guidelines
The exposed die attach pad must be connected to a solid ground plane as this is the primary ground connection
for the chip. Inductance in vias to the pad should be minimized. It is highly recommended to follow the reference
layout. Changes will alter the performance. Also see the PCB landpattern information in this data sheet. For best
performance, minimize the length of the ground vias, by using a 4-layer PCB with ground plane as layer 2 when
CC2590 is mounted onto layer 1.
PCB trace inductors are used to be able to optimize the inductance value, and they are too small to be replaced
by discrete inductors. The placement of the power supply decoupling capacitors C101/C102 and C131/C132 are
important to set the PCB trace inductance values accurately.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): CC2590
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