錚?/div>
C
TH
=
48.6nF
Table 2. Freq. 433.92 MHz, 50% Duty Cycle, Manchester
encoding, no squelch, REFOSC=6.7458MHz, pulse with pre-
amble, fixed mode.
Baud Rate
bps
1200
2400
4800
9600
C
TH
47nF
27nF
12nF
5.6nF
C
AGC
2.2碌F
1碌F
0.47碌F
0.22碌F
Table 2.
SEL0
1
0
1
1
SEL1
0
1
1
1
The closest commercial value is 47nF. Notice that the C
TH
value is dependent mainly on the baud rate (data pattern) and
the reference oscillator frequency. See Table 1 and 2 for
other baud rates and frequencies.
Note 1: The AGC capacitor values are suggested values and will depend on how much dead time there is between preamble and data and how fast the
receiver needs to be in stead state.
Note 2: For 33/66 coding scheme, use the same equation 1 to calculate C
TH
.
Note 3: Application note 22 has further information about the C
TH
pin.
MICREL INC.
TEL
1849 FORTUNE DRIVE SAN JOSE, CA 95131
FAX
USA
+ 1 (408) 944-0800
+ 1 (408) 944-0970
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
漏 2001 Micrel Incorporated
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
November 2001
1
Application Hint 42
1
