nRF2401 Nordic VLSI, nRF2401 Datasheet - Page 31

• Manufacturer Part Number: nRF2401
• Description: Single Chip 2.4GHz Radio Transceiver
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
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 200-700 . A de-embedded load impedance i.e. impedance seen at drain
terminals of the output transistors of 400 is recommended for maximum output
power (0dBm). Lower load impedance (for instance 50 ) can be obtained by fitting a
simple matching network.
Tolerance includes initially accuracy and tolerance over temperature and aging.
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
Specifying a lower value of crystal parallel equivalent capacitance, Co is also good,
but this can increase the price of the crystal itself. Typically Co=1.5pF at a crystal
specified for Co_max=7.0pF.
Nordic VLSI ASA
Revision: 1.0
Conditions: VDD = 3.0V, VSS = 0V, T
-
Table 20 RF output power setting for the nRF2401.
12
16
20
4
8
Vestre Rosten 81, N-7075 Tiller, Norway
Table 21 Crystal specification of the nRF2401
11
10
01
00
L
=12pF is OK, but it is possible to use up to 16pF.
12pF
12pF
12pF
12pF
12pF
/
150
100
100
Page 31 of 37
-10 dBm ±3dB
-20 dBm ±3dB
-5 dBm ±3dB
0 dBm ±3dB
A
= 27ºC, Load impedance = 400 .
7.0pF
7.0pF
7.0pF
7.0pF
7.0pF
PD[
-
Phone [phone]
±30ppm
±30ppm
±30ppm
±30ppm
±30ppm
13.0 mA
10.5 mA
9.4 mA
8.8 mA
-
Fax [phone]
March 2003