NRF403 Datasheet, PDF (9/15 Pages) List of Unclassifed Manufacturers – 315/433 MHz Single Chip RF Transceiver

PRODUCT SPECIFICATION
nRF403 Single Chip RF Transceiver
PLL loop filter
The synthesiser loop filter is an external, single-ended second order lag-lead filter.
The recommended filter component values are: C3 = 820 pF, C4 =15 nF, and
R2 = 4.7 kΩ, see Figure 12.
VCO inductor
An external 22nH (433 MHz operation) or 47nH (315 MHz operation) 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 or 315 MHz, with a maximum tolerance of ± 2%. The following 22
nH and 47nH inductors (0603) are suitable for use with nRF403.
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
PE-0603CD220GTT
0603CS-22NXGBC
LQW1608A22NG00
0603G220GTE
KQ0603TE22NG
Part. no.,
47 nH inductors, 0603
PE-0603CD470GTT
0603CS-47NXGBC
LQW1608A47NG00
0603G470GTE
KQ0603TE47NG
Table 6. Vendors and part no. for suitable 22nH and 47nH inductors.
See page 11 and 12 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 10 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 12 and Table 8. C_PCB1 and C_PCB2 are the layout parasitic capacitance on the
circuit board.
Nordic VLSI ASA -
Revision: 1.1
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 9 of 18
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July 2001