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| 型号： | DR-TRC105-450-EV |
| 厂商： | RFM |
| 文件页数： | 45/67页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 450MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 频率： | 447MHz ~ 451MHz |
| 适用于相关产品： | TRC105 |
| 已供物品： | 2 个板，天线，电池 |
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6.0 TRC105 Design-In Steps
Designing a TRC105 into an application consists of seven steps:
1. Select the frequency band for operation from the left column in Table 57 below. This allows the frequency
specific hardware components for the TRC105 to be determined. These include the SAW filter and its
matching components and the VCO tank inductors.
2. Select the modulation type, FSK or OOK, and the RF data bit rate. This allows the configuration of the
TRC105 on-chip filters, the data and clock recovery circuitry and related parameters to be determined.
3. Select the radio regulation under which to operate. This allows the transmitter power level to be deter-
mined.
4. Select the frequency channel or channels to be used. This allows the configuration values for the fre-
quency synthesizer to be tabulated.
5. Select the operating mode to be used: continuous, buffered or packet. For continuous mode, determine if
the TRC105 internal data and clock recovery feature will be used. This allows the configuration of a num-
ber of mode-related registers in the TRC105 to be determined. For packet or buffered mode, select the
data encoding, preamble length, start pattern, FIFO length and the mapping of the TRC105 host proces-
sor interrupts. For packet mode, select packet filtering options (address, CRC, etc.). From these deci-
sions, values for the related configuration registers in the TRC105 can be determined.
6. If needed, prepare a battery power management strategy and determine when various system radios may
be configured for low power consumption.
7. Based on the selections and determinations above, compile the configuration data to be stored in the host
microcontroller to support TRC105 operation.
The details of each of these steps are discussed below.
6.1 Determining Frequency Specific Hardware Component Values
6.1.1 SAW Filters and Related Component Values
RFM offers a low-loss SAW RF filter for each of the TRC105 ’s operating bands listed in Table 57. The part num-
bers for these SAW filters and the values of the related tuning components are referenced to Figure 2. The SAW
filters are designed to take advantage of the TRC105 ’s differential output to achieve low i nsertion loss and high
out-of-band rejection.
bead
bead
Operating Band 1
303.325-307.300 MHz
310.000-319.500 MHz
342.000-348.000 MHz
365.000-380.000 MHz
382.000-398.000 MHz
402.000-407.300 MHz
418.000-434.790 MHz
447.000-451.000 MHz
SAW Filter
RF3602D
RF3603D
RF3604D
RF3605D
RF3606D
RF3607D
RF3608D
RF3609D
VCO Band
300-330 MHz
300-330 MHz
330-365 MHz
365-400 MHz
365-400 MHz
400-440 MHz
400-440 MHz
440-470 MHz
L1
bead 2
bead 2
bead 2
bead 2
2
bead 2
bead 2
2
L2 & L3
68 nH
68 nH
56 nH
47 nH
47 nH
39 nH
33 nH
18 nH
C4
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
L7
220 nH
220 nH
220 nH
220 nH
220 nH
10 nH
220 nH
220 nH
L8
short
short
3.3 nH
33 nH
68 nH
5.6 nH
5.6 nH
56 nH
C16
DNP
DNP
DNP
DNP
DNP
15 pF
DNP
DNP
C17
DNP
DNP
15 pF
DNP
DNP
1.2 pF
1.2 pF
DNP
1. XTL1020P crystal recommended as frequency reference for all operating bands.
2. Bead is Fair-Rite 2506033017Y0 or equivalent.
Table 57
www.RFM.com E-mail: info@rfm.com
? 2009-2013 by RF Monolithics, Inc.
Technical support +1.800.704.6079
Page 45 of 67
TRC105 - 05/29/13
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