CC2544_16 Datasheet, PDF (21/29 Pages) Texas Instruments – System-on-Chip for 2.4-GHz USB Applications

CC2544
www.ti.com
APPLICATION INFORMATION
SWRS103D – JUNE 2011 – REVISED MAY 2012
Few external components are required for the operation of the CC2544. A typical application circuit is shown in
Figure 19. For suggestions of component values other than those listed in Table 2, see reference design
CC2544EM. The performance stated in this data sheet is only valid for the CC2544EM reference design. To
obtain similar performance, the reference design should be copied as closely as possible.
C311
R251
C11
R11
D+
D–
R21
C21
4-V to 5.45-V
Power Supply
C41
1 USB_P
2 USB_N
3 VDD
4 DCPL2
5 VBUS
6 P1_0
7 P1_1
8 VDD
CC2544
DIE ATTACH PAD
VDD 24
VDD 23
VDD 22
RF_N 21
RF_P 20
VDD 19
XOSC2 18
XOSC1 17
Antenna
(50 W)
Power Supply Decoupling Capacitors are Not Shown
Digital I/O Not Connected
C171
Figure 19. CC2544 Application Circuit
C181
S0383-06
Table 2. Overview of External Components (Excluding Balun, Crystal and Supply Decoupling Capacitors)
Component
C11
C21
C41
C311
R11
R21
R251
Description
USB D+ decoupling
USB D– decoupling
Decoupling capacitor for the internal 5V-3.3V digital voltage
regulator
Decoupling capacitor for the internal 1.8V digital voltage
regulator
USB D+ series resistor
USB D– series resistor
Precision resistor ±1%, used for internal biasing
Value
47 pF
47 pF
1 µF
1 µF
33 Ω
33 Ω
56 kΩ
Input/Output Matching
When using an unbalanced antenna such as a monopole, a balun should be used to optimize performance. The
balun can be implemented using low-cost discrete inductors and capacitors. See reference design, CC2544EM,
for recommended balun.
Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): CC2544
Submit Documentation Feedback
21