CC2620 Datasheet, PDF (34/52 Pages) Texas Instruments – SimpleLink ZigBee RF4CE Wireless MCU

CC2620
SWRS178C – FEBRUARY 2015 – REVISED JULY 2016
7 Application, Implementation, and Layout
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI's customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
7.1 Application Information
Very few external components are required for the operation of the CC2620 device. This section provides
some general information about the various configuration options when using the CC2620 in an
application, and then shows two examples of application circuits with schematics and layout. This is only a
small selection of the many application circuit examples available as complete reference designs from the
product folder on www.ti.com.
Figure 7-1 shows the various RF front-end configuration options. The RF front end can be used in
differential- or single-ended configurations with the options of having internal or external biasing. These
options allow for various trade-offs between cost, board space, and RF performance. Differential operation
with external bias gives the best performance while single-ended operation with internal bias gives the
least amount of external components and the lowest power consumption. Reference designs exist for
each of these options.
Optional
inductor.
Only
needed for
DCDC ^10µH
operation
DCDC_SW
VDDS_DCDC
input
decoupling
10µF±22µF
10µF
To VDDR
pins
CC26xx
(GND exposed die
attached pad)
24MHz
XTAL
(Load caps
on chip)
Pin 3/4 (RXTX)
Pin 2 (RF N)
Pin 1 (RF P)
Red = Not necessary if internal bias is used
Pin 3 (RXTX)
6.8 pF
2.4 nH
1 pF
Antenna
(50 Ohm)
Pin 2 (RF N)
Pin 1 (RF P)
Differential
operation
6.2±6.8 nH
2.4±2.7 nH
2 nH
1 pF
2 nH
12 pF
1 pF
Red = Not necessary if internal bias is used
Pin 2 (RF N)
Pin 1 (RF P)
Single ended
operation
15 nH
2 nH
1.2 pF
Antenna
(50 Ohm)
12 pF
1.2 pF
Red = Not necessary if internal bias is used
Pin 3 (RXTX)
Pin 2 (RF N)
15 nH
2 nH
Single ended
operation with 2
antennas
15 nH
Pin 1 (RF P)
1.2 pF
2 nH
1.2 pF
Antenna
(50 Ohm)
12 pF
1.2 pF
Antenna
(50 Ohm)
12 pF
1.2 pF
Figure 7-1. CC2620 Application Circuit
Copyright © 2016, Texas Instruments Incorporated
34
Application, Implementation, and Layout
Copyright © 2015–2016, Texas Instruments Incorporated
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