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."
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
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
IC name
StrongFirst products
Product name
Frequency [MHz]
CL [pF]
Product code
CC1101, CC1110,
CC1111, CC1100E
S3225
26
10
S3225-26.000M-10-10-10-A
S2016
26
9
S2016-26.000M-9-10-10-E
CC1120,CC1200,
CC1121
(narrow band system)
S2016
32
10
S2016-32.000M-10-10-20-E
S2520
32
10
S2520-32.000M-10-10-20-E
TCXO2520
32
-
TCXO2520-32.000M-2-1.8V-E
CC1125
(narrow band system),
CC1175
S2016
40
10
S2016-40.000M-10-10-20-E
S2016
32
10
S2016-32.000M-10-10-20-E
S2520
40
10
S2520-40.000M-10-10-20-E
S2520
32
10
S2520-32.000M-10-10-20-E
CC430
S3225
26
10
S3225-26.000M-10-10-10-A
S3225
48
16
S3225-48.000M-16-10-10-A
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.
ZigBee IEEE802.15.4
Proprietary
2400MHz~2483.5MHz
StrongFirst products
Product name
Frequency [MHz]
CL [pF]
Product code
CC2500
S2016
26
10
S2016-26.000M-10-10-20-E
CC2510
S2016
26
9
S2016-26.000M-9-10-20-E
CC2511
S3225
40
16
S3225-40.000M-16-10-10-A
CC2520
S3225
32
16
S3225-32.000M-16-10-20-E
CC2530, CC2531
S2520
32
16
S2520-32.000M-16-10-10-E
S2520
32
12
S2520-32.000M-12-10-10-E
S2016
32
12
S2016-32.000M-12-6-30-G
S3225
32
16
S3225-32.000M-16-10-20-E
CC2533
S2016
32
12
S2016-32.000M-12-10-10-A
CC2538
S2016
32
10
S2016-32.000M-10-20-20-A
CC2540
(Bluetooth Low Energy)
S2520
32
16
S2520-32.000M-16-10-10-E
CC2540, CC2541
(Bluetooth Low Energy)
S2016
32
10
S2016-32.000M-10-10-20-E
CC2541
(Bluetooth Low Energy)
S2520
32
10
S2520-32.000M-10-10-20-E
CC2550
S3225
26
16
S3225-26.000M-16-10-10-E
CC256x
(Bluetooth BR/EDR/LE)
S2016
26
9
S2016-26.000M-9-10-10-E
S2520
26
9
S2520-26.000M-9-10-18-E
CC2570, CC2571
(ANT RF network processor)
S3225
32
10
S3225-32.000M-10-10-20-E
CC85xx
(Wireless Audio Streeming)
S3225
48
12
S3225-48.000M-12-10-10-A
S3225
48
16
S3225-48.000M-16-10-10-A
S2016
48
16
S2016-48.000M-16-15-18-E
S2016
48
10
S2016-48.000M-10-10-20-E
refer to:Crystal Selection Guide for CC253x,CC254x link to Texas Instruments site.
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.
