EM260-RCM-USART-R Ember, EM260-RCM-USART-R Datasheet - Page 7

• Manufacturer Part Number: EM260-RCM-USART-R
• Description: EM260 RCM BOARD
• Manufacturer: Ember
• Type: Transceiver, 802.15.4/ZigBeer

Specifications of EM260-RCM-USART-R

• Frequency: 2.4GHz
• For Use With/related Products: EM260
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 636-1025

2 Top-Level Functional Description
RF_TX_ALT_P,N
VREG_OUT
RF_P,N
BIAS_R
OSCA
OSCB
Figure 3 shows a detailed block diagram of the EM260.
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.
manager
Chip
PA select
PA
Regulator
RC-OSC
HF OSC
Internal
Bias
LNA
PA
Controller
Encryption acclerator
Figure 3. EM260 Block Diagram
Serial
SYNTH
IF
Controller
Interrupt
IO Controller
Page 7
DAC
ADC
Always
powered
Sleep
timer
TX_ACTIVE
Baseband
PacketTrace
Integrated Flash and RAM
MAC
+
Network Processor
Watchdog
Peripherals
Processor
Network
(XAP2b)
POR
SIF
nRESET
SIF_CLK
SIF_MISO
SIF_MOSI
nSIF_LOAD
EM260
120-0260-000J