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参数资料
| 型号： | TRC105 |
| 厂商： | RFM |
| 文件页数： | 47/67页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 300MHZ-510MHZ 32TQFN |
| 标准包装： | 1 |
| 频率： | 300MHz ~ 510MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK，OOK |
| 应用： | 通用 |
| 功率 - 输出： | 13dBm |
| 灵敏度： | -112dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 3mA |
| 电流 - 传输： | 30mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-TQFN |
| 包装： | 标准包装 |
| 产品目录页面： | 583 (CN2011-ZH PDF) |
| 其它名称： | 583-1159-6 |
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C must be an integer value, so BR is limited to 256 discrete values. If the value of C given in the above equation
is not an integer for your desired bit rate, round the value of C down to the nearest integer. You can then calculate
the nearest available bit rate equal to or greater than your desired bit rate.
Selection of the RF data rate allows a suitable FSK deviation to be determined. This, in turn, allows the configura-
tion value for the anti-aliasing filters in the transmitter and the configuration values for the R-C and Butterworth
low-pass filters in the receiver to be determined.
The minimum required deviation for good TRC105 FSK performance is:
F DEV = BR
Where F DEV is the deviation in kHz and BR is the bit rate in kb/s. Specific to the TRC105, the minimum recom-
mended deviation is ±33 kHz, even at low data rates. F DEV is configured with an integer R stored in MCFG02 . For
the standard crystal frequency of 12.8 MHz:
F DEV = 12800/(32*(R + 1)), with the useable range of R 1 to 11
Where F DEV is the deviation in kHz. Solving the equation above for R:
R = (12800 - 32*F DEV )/32*F DEV
R must be an integer value, so F DEV is limited to 11 discrete values. If the value of R given in the above equation
is not an integer for your desired deviation, round the value of R down to the nearest integer and use this value to
meet or exceed the minimum required deviation for the bit rate you are using.
Once BR and F DEV have been determined, the bandwidths and related configuration values for the TRC105 filters
can be determined. The recommended 3 dB bandwidth (cutoff frequency) for the transmitter anti-aliasing filters is:
F CTX = 3*F DEV + 1.5*BR
Where F CTX is the 3 dB bandwidth of the transmitter anti-aliasing filters in kHz, F DEV is the frequency deviation in
kHz and BR is the bit rate in kb/s. F CTX is configured with bits 7..4 in TXCFG1A . For the standard crystal frequen-
cy of 12.8 MHz:
F CTX = 200*(K + 1)/8, with K in the range of 0 to 15
Where F CTX is the 3 dB bandwidth of the transmitter anti-aliasing filters in kHz and K is the integer value of the bit
pattern in TXCFG1A bits 7..4. Solving the equation above for K:
K = (F CTX - 25)/25
K must be an integer value, so F CTX is limited to 16 discrete values. If the value of K given in the above equation is
not an integer for your desired deviation, round the value of K down to the nearest integer and use this value to
set the bandwidth of the transmitter anti-aliasing filters. For operation at 90 kb/s and above, use a value of 15
for K.
The recommended 3 dB bandwidth for the receiver Butterworth filters is:
F CBW = 2*F DEV + BR
Where F CBW is the 3 dB bandwidth of the Butterworth filters in kHz, F DEV is the frequency deviation in kHz and BR
is the bit rate in kb/s. This equation assumes use of the high accuracy, low drift XTL1020P crystal. If an alterna-
tive crystal is used, add ? the expected drift due to temperature and aging to the equation above. F CBW is config-
ured with bits 3..0 in RXCFG10 . For the standard crystal frequency of 12.8 MHz:
F CBW = 200*(J + 1)/8, with J in the range of 0 to 15
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Page 47 of 67
TRC105 - 05/29/13
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