CC1020-RTR1 datasheet(85/95 Pages) TI1

85 / 95 page

CC1020

www.ti.com

SWRS046H – NOVEMBER 2006 – REVISED MARCH 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

220 nF, 10%, X7R, 0603

100 nF, 10%, X7R, 0603

8.2 nF, 10%, X7R, 0402

3.9 nF, 10%, X7R, 0402

2.2 nF, 10%, X7R, 0402

1.0 nF, 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

1.5 k

Ω, 5%, 0402

2.2 k

Ω, 5%, 0402

2.2 k

Ω, 5%, 0402

4.7 k

Ω, 5%, 0402

6.8 k

Ω, 5%, 0402

6.8 k

Ω, 5%, 0402

R10

Ω, 5%, 0402

14.7456 MHz crystal,

XTAL

16 pF load

(1)

The PLL loop filter component values in Table 6-2 (R2, R3, C6-C8) can be used for data rates up to 4.8 kBaud.

(2)

The SmartRF Studio software provides component values for other data rates using the equations in Section 5.12.2.

(3)

Items shaded vary for different frequencies. For 433 MHz, 12.5 kHz channel, a loop filter with lower bandwidth is used to improve

adjacent and alternate channel rejection.

In the CC1020EMX reference design (CC1020EMX), 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 and Output Matching

L1 and C1 are 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 CC1020 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 can be

used for data rates up to 4.8 kBaud. Component values for higher data rates are easily found using the

SmartRF Studio software.

Applications, Implementation, and Layout

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