NRF2401A Datasheet, PDF (31/38 Pages) List of Unclassifed Manufacturers – Single chip 2.4 GHz Transceiver

PRODUCT SPECIFICATION
nRF2401A Single Chip 2.4 GHz Radio Transceiver
PERIPHERAL RF INFORMATION
Antenna output
The ANT1 & ANT2 output pins provide a balanced RF output to the antenna. The
pins must have a DC path to VDD, either via a RF choke or via the center point in a
dipole antenna. The load impedance seen between the ANT1/ANT2 outputs should be
in the range 200-700Ω. A load of 100Ω+j175Ω is recommended for maximum output
power (0dBm). Lower load impedance (for instance 50 Ω) can be obtained by fitting a
simple matching network.
Output Power adjustment
Power setting bits of RF output power DC current
configuring word
consumption
11
0 dBm ±3dB
13.0 mA
10
-5 dBm ±3dB
10.5 mA
01
-10 dBm ±3dB
9.4 mA
00
-20 dBm ±3dB
8.8 mA
Conditions: VDD = 3.0V, VSS = 0V, T_A = 27ºC, Load impedance = 100Ω+j175Ω.
Table 20 RF output power setting for the nRF2401A.
Crystal Specification
Tolerance includes initially accuracy and tolerance over temperature and aging.
Frequency C_L
4
12pF
8
12pF
12
12pF
16
12pF
20
12pF
ESR
150 Ω
100 Ω
100 Ω
100 Ω
100 Ω
C_0max
7.0pF
7.0pF
7.0pF
7.0pF
7.0pF
Tolerance
±30ppm
±30ppm
±30ppm
±30ppm
±30ppm
Table 21 Crystal specification of the nRF2401A
To achieve a crystal oscillator solution with low power consumption and fast start-up
time, it is recommended to specify the crystal with a low value of crystal load
capacitance. Specifying C_L=12pF is OK, but it is possible to use up to 16pF.
Specifying a lower value of crystal parallel equivalent capacitance, C₀ will also work,
but this can increase the price of the crystal itself. Typically C₀=1.5pF at a crystal
specified for C_0max=7.0pF.
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
Page 31 of 38
December 2004