CC1021-RTR1 datasheet(81/91 Pages) TI1

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Not Recommended for New Designs NRND

CC1021

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SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

Table 6-2. Bill of Materials for the Application Circuit in Figure 6-1 (1)(2)

ITEM

433 MHz

868 MHz

915 MHz

C1(3)

10 pF, 5%, NP0, 0402

47 pF, 5%, NP0, 0402

C3(3)

5.6 pF, 5%, NP0, 0402

10 pF, 5%, NP0, 0402

22 pF, 5%, NP0, 0402

12 pF, 5%, NP0, 0402

3.9 nF, 10%, X7R, 0603

120 pF, 10%, X7R, 0402

33 pF, 10%, X7R, 0402

C60

220 pF, 5%, NP0, 0402

L1(3)

33 nH, 5%, 0402

82 nH, 5%, 0402

L2(3)

22 nH, 5%, 0402

3.6 nH, 5%, 0402

82 k

Ω, 1%, 0402

82 k

Ω, 1%, 0402

82 k

Ω, 1%, 0402

12 k

Ω, 5%, 0402

12 k

Ω, 5%, 0402

12 k

Ω, 5%, 0402

39 k

Ω, 5%, 0402

39 k

Ω, 5%, 0402

39 k

Ω, 5%, 0402

R10

Ω, 5%, 0402

XTAL

14.7456 MHz crystal, 16 pF load

(1)

The PLL loop filter is optimized for 38.4 kBaud data rate.

(2)

The PLL loop filter component values in Table 6-2 (R2, R3, C6-C8) are optimized for 38.4 kBaud data rate. The SmartRF Studio

software provides component values for other data rates using the equations in Section 5.12.1.

(3)

Items shaded vary for different frequencies.

In the CC1020EMX reference design, which is also applicable for CC1021, LQG15HS series inductors

from Murata have been used. The switch is SW-456 from M/A-COM.

The LC filter in Figure 6-1 is inserted in the TX path only. The filter will reduce the emission of harmonics

and the spurious emissions in the TX path. An alternative is to insert the LC filter between the antenna

and the T/R switch as shown in Figure 6-2.

The filter will reduce the emission of harmonics and the spurious emissions in the TX path as well as

increase the receiver selectivity. The sensitivity will be slightly reduced due to the insertion loss of the LC

filter.

6.2

Design Requirements

6.2.1

Input / Output Matching

L1 and C1 is the input match for the receiver. L1 is also a DC choke for biasing. L2 and C3 are used to

match the transmitter to 50

Ω. Internal circuitry makes it possible to connect the input and output together

and match the CC1021 to 50

Ω in both RX and TX mode. However, it is recommended to use an external

T/R switch for optimum performance. See Section 5.11 for details. Component values for the matching

network are easily found using the SmartRF™ Studio software.

6.2.2

Bias Resistor

The precision bias resistor R1 is used to set an accurate bias current.

6.2.3

PLL Loop Filter

The loop filter consists of two resistors (R2 and R3) and three capacitors (C6 through C8). C7 and C8 may

be omitted in applications where high loop bandwidth is desired. The values shown in Table 6-2 are

optimized for 38.4 kBaud data rate. Component values for other data rates are easily found using the

SmartRF Studio software.

Applications, Implementation, and Layout

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CC1021-RTR1 Datasheet(PDF) 81 Page - Texas Instruments

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