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参数资料
| 型号： | SI4461-868-DK |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 38/56页 |
| 文件大小： | 0K |
| 描述： | KIT DEV WIRELESS SI4461 868MHZ |
| 标准包装： | 1 |
| 系列： | EZRadioPRO® |
| 类型： | 收发器，ISM |
| 频率： | 868MHz |
| 适用于相关产品： | Si4461 |
| 已供物品： | 8 个板，天线，电池，线缆，电源，软件 |
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Si4464/63/61/60
5.5. Crystal Oscillator
The Si446x includes an integrated crystal oscillator with a fast start-up time of less than 250 μs. The design is
differential with the required crystal load capacitance integrated on-chip to minimize the number of external
components. By default, all that is required off-chip is the crystal. The default crystal is 30 MHz, but the circuit is
designed to handle any XTAL from 25 to 32 MHz. If a crystal different than 30 MHz is used, the POWER_UP API
boot command must be modified. The WDS calculator crystal frequency field must also be changed to reflect the
frequency being used. The crystal load capacitance can be digitally programmed to accommodate crystals with
various load capacitance requirements and to adjust the frequency of the crystal oscillator. The tuning of the crystal
load capacitance is programmed through the GLOBAL_XO_TUNE API property. The total internal capacitance is
11 pF and is adjustable in 127 steps (70 fF/step). The crystal frequency adjustment can be used to compensate for
crystal production tolerances. The frequency offset characteristics of the capacitor bank are demonstrated in
Figure 15.
Figure 15. Capacitor Bank Frequency Offset Characteristics
Utilizing the on-chip temperature sensor and suitable control software, the temperature dependency of the crystal
can be canceled.
A TCXO or external signal source can easily be used in place of a conventional XTAL and should be connected to
the XIN pin. The incoming clock signal is recommended to have a peak-to-peak swing in the range of 600 mV to
1.4 V and ac-coupled to the XIN pin. If the peak-to-peak swing of the TCXO exceeds 1.4 V peak-to-peak, then dc
coupling to the XIN pin should be used. The maximum allowed swing on XIN is 1.8 V peak-to-peak.
The XO capacitor bank should be set to 0 whenever an external drive is used on the XIN pin. In addition, the
POWER_UP command should be invoked with the TCXO option whenever external drive is used.
38
Rev 1.2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI4461-A1A-FM | 制造商:Silicon Laboratories Inc 功能描述:+13DBM SI4430 EZRADIOPRO? TRANSMITTER (REV B1) - Rail/Tube |
| SI4461-A1A-FMR | 制造商:Silicon Laboratories Inc 功能描述:+13DBM SI4430 EZRADIOPRO? TRANSMITTER (REV B1) - Tape and Reel |
| Si4461-B0B-FM | 功能描述:射频收发器 TRX ROM 61 EZRadioPRO RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| Si4461-B0B-FMR | 功能描述:射频收发器 TRX ROM 61 EZRadioPRO RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| Si4461-B1B-FM | 功能描述:射频收发器 TRX RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
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