For customers designing Texas Instruments
CC1xxx, CC25xx, CC430, CC85xx series Low Power RF applications

The following provides a basic explanation of design considerations for the external oscillation circuit using quartz crystal for 'Low Power RF' technology including ZigBee,IEEE802.15.4 and sub 1 GHz band wireless applications. "Please refer to Texas Instrument ZigBee/IEEE802.15.4 and sub 1 GHz band solution below."

Clock solution recommendations

In realizing low power consumption RF designs, the following factors should be taken into consideration.

  1. Oscillation start-up time
  2. Frequency tuning
  3. Lower BER(Bit Error Rate) over operating temperature
No. Oscillation Circuit Factor 2.4GHz , sub 1GHz sub 1GHz(narrow band)
AT crystal unit spec. TCXO spec.
1 Quick oscillation start-up time
- High oscillation allowance
- Boost inverter
Lower ESR(R1)
High drive level
Quick start-up time
2 Easy frequency control
- inner frequency tuning capacitor
proper frequency sensitivity
low parameters' variation
High frequency stability
3 Lower BER
- temperature compensation
High frequency stability High frequency stability
diagram
MHz Crystal equivalent circuit
Oscillation start-up time
→ Lower ESR (R1) , Higher C1
→ Higher drive level
Suitable Frequency Tuning
→ Lower parameters variation(C0,C1,L1,ESR)
Suitable Frequency Tuning
→ Proper Sensitivity (CL,C0)
Higher Frequency Stability
→ Stable fSTA

Texas Instruments MSP430 clock solution Here

For CC1xxx Series, CC430 Family

sub 1GHz band

IC name EPSON products
Product name Frequency [MHz] CL [pF] Product code
CC1020
(narrow band system)
TG-5021CG
12.288
-
-
14.7456
-
-
CC1101, CC1110,
CC1111, CC1100E
TSX-3225
26
10
FA-128
26
9
CC1120,CC1200,
CC1121
(narrow band system)
FA-128
32
10
FA-20H
32
10
TG-5021CG
33.6
-
TG-5021CG
32
-
TG-5035CG
32
-
CC1125
(narrow band system),
CC1175
FA-128
40
10
FA-128
32
10
FA-20H
40
10
FA-20H
32
10
TG-5021CG
33.6
-
TG-5021CG
32
-
CC430
TSX-3225
26
10
TSX-3225
48
16

Notes:  Above recommendations are based on actual evaluation results and intended to support users in picking the right components. And the results are only according to the sample set that received from our customers, so it is not including the dispersion trend of IC and the external parts.
As the actual board layout and choice of external components influences the best suitable crystal load capacitance, We do not assume any responsibility and grant warranty for above recommendations.
Users design must be verified and decided by own and individual evaluation.

For CC2xxx and CC85xx Series

2.4 GHz band

ZigBee IEEE802.15.4
Proprietary
2400MHz~2483.5MHz
EPSON products
Product name Frequency [MHz] CL [pF] Product code
CC2500
FA-128
26
10
CC2510
FA-128
26
9
CC2511
TSX-3225
40
16
CC2520
TSX-3225
32
16
CC2530, CC2531
FA-20H
32
16
FA-20H
32
12
FA-128
32
12
TSX-3225
32
16
CC2533
FA-128
32
12
CC2538
FA-128
32
10
CC2540
(Bluetooth Low Energy)
FA-20H
32
16
CC2540, CC2541
(Bluetooth Low Energy)
FA-128
32
10
CC2541
(Bluetooth Low Energy)
FA-20H
32
10
CC2550
TSX-3225
26
16
CC256x
(Bluetooth BR/EDR/LE)
FA-128
26
9
FA-20H
26
9
CC2570, CC2571
(ANT RF network processor)
TSX-3225
32
10
CC85xx
(Wireless Audio Streeming)
TSX-3225
48
12
TSX-3225
48
16
FA-128
48
16
FA-128
48
10

refer to: Crystal Selection Guide for CC253x,CC254x link to Texas Instruments sitepdf.

Notes: Above recommendations are based on actual evaluation results and intended to support users in picking the right components. And the results are only according to the sample set that received from our customers, so it is not including the dispersion trend of IC and the external parts.
As the actual board layout and choice of external components influences the best suitable crystal load capacitance, We do not assume any responsibility and grant warranty for above recommendations.
Users design must be verified and decided by own and individual evaluation.
Please refer to Texas Instruments CC2xxx manual for designing.

*ZigBee is a registered trademark of Koninklijke Philips Electronics N.V.

Page Top