CC2430-RTR1-F64Z datasheet(29/234 Pages) TI

29 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 29 of 232

11 Application Circuit

Few external components are required for the

operation of

CC2430. A typical application

circuit is shown in Figure 6. Typical values and

description of external components are shown

in Table 24

11.1 Input / output matching

The RF input/output is high impedance and

differential. The optimum differential load for

the RF port is 115+j180

Ω.

When using an unbalanced antenna such as a

monopole, a balun should be used in order to

optimize performance. The balun can be

implemented using low-cost discrete inductors

and capacitors. The recommended balun

shown, consists of C341, L341, L321 and

L331

together

with

PCB

microstrip

transmission line (λ/2-dipole), and will match

the RF input/output to 50

Ω. An internal T/R

switch circuit is used to switch between the

LNA and the PA. See Input/output matching

section on page 184 for more details.

If a balanced antenna such as a folded dipole

is used, the balun can be omitted. If the

antenna also provides a DC path from

TXRX_SWITCH pin to the RF pins, inductors

are not needed for DC bias.

Figure 6 shows a suggested application circuit

using a differential antenna. The antenna type

is a standard folded dipole. The dipole has a

virtual ground point; hence bias is provided

without degradation in antenna performance.

Also

refer

the

section

Antenna

Considerations on page 189.

11.2 Bias resistors

The bias resistors are R221 and R261. The

bias resistor R221 is used to set an accurate

bias current for the 32 MHz crystal oscillator.

11.3 Crystal

An external 32 MHz crystal, XTAL1, with two

loading capacitors (C191 and C211) is used

for the 32 MHz crystal oscillator. See page 16

for details.

XTAL2 is an optional 32.768 kHz crystal. Mesh

networks can be implemented without the

32.768 kHz crystal.

11.4 Voltage regulators

The on chip voltage regulators supply all 1.8 V

power supply pins and internal power supplies.

C241 and C421 are required for stability of the

regulators. A series resistor may be used to

comply with the ESR requirement.

11.5 Power

supply

decoupling

and

filtering

Proper power supply decoupling must be used

for optimum performance. The placement and

size of the decoupling capacitors and the

power supply filtering are very important to

achieve

the

best

performance

application. Chipcon provides a compact

reference design that should be followed very

closely. Refer to the section PCB Layout

Recommendation on page 188.

CC2430-RTR1-F64Z 数据表(PDF) 29 Page - Texas Instruments

CC2430-RTR1-F64Z 数据表(HTML) 29 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载