参数资料
型号: AT86RF212-ZU
厂商: Atmel
文件页数: 6/172页
文件大小: 0K
描述: IC TXRX ZIGBE/802.15.4/ISM 32QFN
产品培训模块: MCU Wireless Solutions Product Line Introduction
标准包装: 2,450
频率: 700MHz,800MHz,900MHz
数据传输率 - 最大: 250kbps
调制或协议: 802.15.4 Zigbee,6LoWPAN,ISM
应用: ISM,ZigBee?
功率 - 输出: 10dBm
灵敏度: -110dBm
电源电压: 1.8 V ~ 3.6 V
电流 - 接收: 9.2mA
电流 - 传输: 25mA
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-VFQFN 裸露焊盘
包装: 托盘
2.2.1.2 RF Pins
RFN, RFP
A differential RF port (RFP/RFN) provides common-mode rejection to suppress the
switching noise of the internal digital signal processing blocks. At board-level, the
differential RF layout ensures high receiver sensitivity by reducing spurious emissions
originated from other digital ICs such as a microcontroller.
The RF port is designed for a 100 Ω differential load. A DC path between the RF pins is
allowed. A DC path to ground or supply voltage is not allowed. Therefore, when
connecting a RF-load providing a DC path to the power supply or ground, AC-coupling
is required as indicated in Table 2-2.
A simplified schematic of the RF front end is shown in Figure 2-2.
Figure 2-2. Simplified RF Front-end Schematic
RF port DC values depend on the operating state; refer to section 5. In TRX_OFF state,
when the analog front-end is disabled (see section 5.1.2.3), the RF pins are pulled to
ground, preventing a floating voltage larger than 1.8 V which is not allowed for the
internal circuitry.
In transmit mode, a control loop provides a common-mode voltage of 0.9 V. Transistor
M0 is off, allowing the PA to set the common-mode voltage. The common-mode
capacitance at each pin to ground shall be < 100 pF to ensure the stability of this
common-mode feedback loop.
In receive mode, the RF port provides a low-impedance path to ground when transistor
M0 (see Figure 2-2) pulls the inductor center tap to ground. A DC voltage drop of 20 mV
across the on-chip inductor can be measured at the RF pins.
Matching control (MC) is implemented by an adjustable capacitance to ground at each
RF pin as shown in Figure 2-2. The input capacitance can be changed within 15 steps
by setting a 4-bit control word (register 0x19, RF_CTRL_1); refer to section 7.2.3.
6
AT86RF212
8168C-MCU Wireless-02/10
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