NRF2401 Datasheet, PDF (13/37 Pages) List of Unclassifed Manufacturers – Single chip 2.4 GHz Transceiver

PRODUCT SPECIFICATION
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In both ShockBurst™ & Direct modes the nRF2401 can facilitate simultaneous
reception of two parallel independent frequency channels at the maximum data rate.
This means:
• nRF2401 can receive data from two 1 Mbps transmitters (ex: nRF2401 or
nRF2402) 8 MHz (8 frequency channels) apart through one antenna
interface.
• The output from the two data channels is fed to two separate MCU
interfaces.
• Data channel 1: CLK1, DATA, and DR1
• Data channel 2: CLK2, DOUT2, and DR2
• DR1 and DR2 are available only in ShockBurst™.
The nRF2401 DuoCeiver™ technology provides 2 separate dedicated data channels
for RX and replaces the need for two, stand alone receiver systems.
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Figure 8 Simultaneous 2 channel receive on nRF2401
There is one absolute requirement for using the second data channel. For the nRF2401
to be able to receive at the second data channel the frequency channel must be 8MHz
higher than the frequency of data channel 1. The nRF2401 must be programmed to
receive at the frequency of data channel 1. No time multiplexing is used in nRF2401
to fulfil this function. In direct mode the MCU must be able to handle two
simultaneously incoming data packets if it is not multiplexing between the two data
channels. In ShockBurst™ it is possible for the MCU to clock out one data channel at
a time while data on the other data channel waits for MCU availability, without any
lost data packets, and by doing so reduce the needed performance of the MCU.
Clock
ADDR,
DR1
F_RF1
Recovery,
CRC
CLK1
Data(F_RF1)
DataSlicer
Check
DATA
F_RF2=F_RF1+8MHz
Clock
Recovery,
DataSlicer
ADDR,
CRC
Check
DR2
CLK2
DOUT2
Data(F_RF2)
Figure 9 DuoCeiver^TM with two simultaneously independent receive channels.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
Page 13 of 37
March 2003