PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.1 Page 30 of 40 March 2006
Direct Mode
Direct Mode TX:
CS
CLK1
DATA
CE
PWR_UP
Td
ANT1/ANT2
T
sby2txDM
ToaDM Tfd
t = 0
Figure 17 Timing of direct mode TX
In TX direct mode the input data will be sampled by nRF2401A and therefore no
clock is needed. The clock must be stable at low level during transmission due to
noise considerations. The exact delay T
sby2txDM
is given by the equation:
usFusT
XOtxDMsby
25.214/1194
2
+⋅+=
The maximum length of a package (ToaDM) over all voltages and temperatures is
4ms. This is limited by frequency drift in the transmitter and is independent of data
rate and frequency channel.
