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参数资料
| 型号： | DR-TRC101-315-DK |
| 厂商： | RFM |
| 文件页数： | 5/42页 |
| 文件大小： | 0K |
| 描述： | RFIC TRANCEIVER DEVELOPMENT KIT |
| 产品变化通告： | RFIC Obsolescence 15/Sept/2009 |
| 标准包装： | 1 |
| 类型： | 收发器，SRR |
| 频率： | 315MHz |
| 适用于相关产品： | TRC101-315 |
| 已供物品： | 2 个板，2 根天线，电池，线缆，CD |
| 其它名称： | 583-1051 |
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916 MHz
2.2e-3 – j1.55e-2
9 + j63
11.2nH
These values are what the RF port pins want to “see” as an antenna load for maximum power transfer.
Antennas ideally suited for this would be a Dipole, Folded Dipole, and Loop. For all transmit antenna
applications a bias or “choke” inductor must be included since the RF outputs are open-collector type.
The TRC101 may also drive a single ended 50 Ohm load, such as a monopole antenna, using the
matching circuit as shown in Figure 1. Use of a balun would provide an optimum power transfer, but the
matching circuit of Figure 1 has been optimized for use with discrete components, reducing the cost
associated with use of a balun. The matching component values for a 50 Ohm load for each band are
given in Table 2.
Table 2.
Ref Des
C1
C2
C4
C7
L1
L2
L3
315
6.8pF
3.9pF
.1uF
100pF
56nH
390nH
68nH
433
5.1pF
2.7pF
.1uF
100pF
33nH
390nH
47nH
868
2.7pF
1.2pF
.1uF
100pF
8.2nH
100nH
22nH
916
2.7pF
1.2pF
.1uF
100pF
8.2nH
100nH
22nH
Antenna Design Considerations
The TRC101 is designed to drive a differential output such as a Dipole antenna or a Loop. The loop
antenna is ideally suited for applications where compact size is required. The dipole is typically not an
attractive option for compact designs due to its inherent size at resonance and distance needed away
from a ground plane to be an efficient antenna. A monopole antenna can be used with the addition of a
balun or by using the matching circuit in Figure 1.
PCB Layout Considerations
Optimal PCB layout is very critical. For optimal transmit and receive performance, the trace lengths at the
RF pins must be kept as short as possible. Using small, surface mount components, like 0402 or 0603,
will yield the best performance as well as keep the RF port compact. Make all RF connections short and
direct. A good rule of thumb to adhere to is add 1nH of series inductance for every 0.1” of trace length.
The crystal oscillator is also affected by additional trace length as it adds parasitic capacitance to the
overall load of the crystal. To minimize this effect place the crystal as close as possible to the chip and
make all connections short and direct. This will minimize the effects of “frequency pulling” that stray
capacitance may introduce and allows the internal load capacitance of the chip to be more effective in
properly loading the crystal oscillator circuit.
If using an external processor, the TRC101 provides an on-chip clock for that purpose. Even though this
is an integrated function, long runs of the clock signal may radiate and cause interference. This can
degrade receiver performance as well as add harmonics or unwanted modulation to the transmitter.
Keep clock connections as short as possible and surround the clock trace with an adjacent ground plane
pour where needed. This will help in reducing any radiation or crosstalk due to long runs of the clock
signal.
Good power supply bypassing is also essential. Large decoupling capacitors should be placed at the
point where power is applied to the PCB. Smaller value decoupling capacitors should then be placed at
each power point of the chip as well as bias nodes for the RF port. Poor bypassing lends itself to
conducted interference which can cause noise and spurious signals to couple into the RF sections,
significantly reducing performance.
www.RFM.com
Email: info@rfm.com
Page 5 of 42
?by RF Monolithics, Inc.
TRC101 - 4/8/08
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