NRF402 Datasheet, PDF (8/16 Pages) List of Unclassifed Manufacturers – 433MHz Single Chip RF Transmitter

PRODUCT SPECIFICATION
nRF402 Single Chip RF Transmitter
VCO inductor
An external 22nH inductor connected between the VCO1 and VCO2 pins is required
for the on-chip voltage controlled oscillator (VCO). This inductor should be a high
quality chip inductor, Q > 45 @ 433 MHz, with a maximum tolerance of ± 2%. The
following 22 nH inductors (0603) are suitable for use with nRF402, see Table 7.
Vendors
Pulse
Coilcraft
muRata
Stetco
KOA
WWW address
http://www.pulseeng.com
http://www.coilcraft.com
http://www.murata.com
http://www.stetco.com
http://www.koaspeer.com
Part. no., 22 nH inductors,
0603 size
PE-0603CD220GTT
0603CS-22NXGBC
LQW1608A22NG00
0603G220GTE
KQ0603TE22NG
Table 7. Vendors and part no. of suitable 22 nH inductors
See page 10 for PCB layout guidelines regarding placement of the inductor.
Crystal specification
To achieve an active crystal oscillator (XOSC) with low power consumption, certain
requirements apply for crystal loss and capacitive load.
The crystal specification is:
f= 4.0000 MHz
Co ≤ 5 pF
ESR ≤150 ohm .
C_L ≤ 14 pF
Crystal parallel resonant frequency
Crystal parallel equivalent capacitance
Crystal equivalent series resistance
Total crystal load capacitance, including capacitance in
PCB layout.
For the crystal oscillator shown in Figure 9 the load capacitance becomes
C_L
=
C1´⋅ C 2´
C1´+ C2´
,
Where C1´ = C1 + C_PCB1 and C2´ = C2 + C_PCB2
C1 and C2 are 0603 SMD capacitors as shown in the application schematic, see
Figure 11 and Table 8. C_PCB1 and C_PCB2 are the layout parasitic capacitance on the
circuit board.
Nordic VLSI ASA
Revision: 2.1
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 8 of 16
Phone [phone] -
Fax [phone]
February 2000