参数资料
型号: EM260-RCM-USART-R
厂商: Silicon Laboratories Inc
文件页数: 7/50页
文件大小: 0K
描述: EM260 RCM BOARD
标准包装: 12
类型: 收发器,802.15.4/Zigbee
频率: 2.4GHz
适用于相关产品: EM260
其它名称: 636-1025
EM260
2 Top-Level Functional Description
Figure 3 shows a detailed block diagram of the EM260.
TX_ACTIVE
PA select
RF_TX_ALT_P,N
PA
PA
SYNTH
DAC
MAC
+
Network
Processor
RF_P,N
LNA
IF
ADC
Baseband
(XAP2b)
PacketTrace
BIAS_R
Bias
OSCA
OSCB
HF OSC
Encryption acclerator
Network Processor
Peripherals
Integrated Flash and RAM
VREG_OUT
Internal
RC-OSC
Regulator
Serial
Controller
Interrupt
Controller
Always
powered
Sleep
timer
Watchdog
POR
nRESET
SIF_CLK
Chip
manager
IO Controller
SIF
SIF_MISO
SIF_MOSI
nSIF_LOAD
Figure 3. EM260 Block Diagram
The radio receiver is a low-IF, super-heterodyne receiver. It utilizes differential signal paths to minimize noise
interference, and its architecture has been chosen to optimize co-existence with other devices within the
2.4GHz band (namely, IEEE 802.11g and Bluetooth). After amplification and mixing, the signal is filtered and
combined prior to being sampled by an ADC.
The digital receiver implements a coherent demodulator to generate a chip stream for the hardware-based
MAC. In addition, the digital receiver contains the analog radio calibration routines and control of the gain
within the receiver path.
The radio transmitter utilizes an efficient architecture in which the data stream directly modulates the VCO.
An integrated PA boosts the output power. The calibration of the TX path as well as the output power is
controlled by digital logic. If the EM260 is to be used with an external PA, the TX_ACTIVE signal should be used
to control the timing of the external switching logic.
The integrated 4.8 GHz VCO and loop filter minimize off-chip circuitry. Only a 24MHz crystal with its loading
capacitors is required to properly establish the PLL reference signal.
Page 7
120-0260-000M Rev 1.1
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