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| 型号： | 4463-TSQ27F169-EK |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 38/56页 |
| 文件大小： | 0K |
| 描述： | KIT EZRADIO TEST CARD SI4463 TX |
| 设计资源： | 4463-TSQ27F169 PCB 4463-TSQ27F169 SCH |
| 标准包装： | 1 |
| 系列： | EZRadioPRO® |
| 类型： | 收发器，ISM |
| 频率： | 169MHz |
| 适用于相关产品： | Si4463 |
| 已供物品： | 板 |
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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 |
|---|---|
| 4464 | 功能描述:以太网和电信连接器 SHIELD CONNECTOR RoHS:否 制造商:Pulse 产品:Modular Jacks 性能类别: USOC 代码:RJ45 位置/触点数量: 安装风格:Through Hole 端口数量:1 x 1 型式:Female 屏蔽: 电流额定值: 电压额定值: 触点电镀: 外壳材料:Thermoplastic IP 等级: |
| 44640-01-445-1 | 制造商:UNBRANDED 功能描述:IC SOCKET +0.1UF 40WAY |
| 446405-1 | 功能描述:D-Sub混合触点连接器 SIZE 4 8C8 COAX-MIX 100 RoHS:否 制造商:FCI 触点布置: 位置/触点数量: 安装风格:Through Hole 安装角: 端接类型:Solder |
| 446405-2 | 功能描述:D-Sub混合触点连接器 8C8 PLUG ASSY RoHS:否 制造商:FCI 触点布置: 位置/触点数量: 安装风格:Through Hole 安装角: 端接类型:Solder |
| 446405-3 | 功能描述:D-Sub混合触点连接器 RECPT ASSY,SZ 4 ,COAX 8C8 RoHS:否 制造商:FCI 触点布置: 位置/触点数量: 安装风格:Through Hole 安装角: 端接类型:Solder |
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