NRF401-IC ETC, NRF401-IC Datasheet - Page 9

• Manufacturer Part Number: NRF401-IC
• Description: 433mhz Single Chip RF Transceiver
• Manufacturer: ETC

PRODUCT SPECIFICATION
nRF401 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 k , see Figure 12.
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 nRF401.
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
For the crystal oscillator shown in Figure 10 the load capacitance becomes:
C1 and C2 are 0603 SMD capacitors as shown in the application schematic, see
Figure 12 and Table 9. C
circuit board.
Nordic VLSI ASA -
Revision: 1.5
Co
C
C
ESR 150
L
L
Vendors
Pulse
Coilcraft
muRata
Stetco
KOA
14
5
C
C
pF
´ 1
´ 1
pF
C
ohm
C
´ 2
´ 2
Table 7. Vendors and part no. for suitable 22nH inductors.
.
,
WWW address
http://www.pulseeng.com
http://www.coilcraft.com
http://www.murata.com
http://www.stetco.com
http://www.koaspeer.com
Where C1´ = C1 + C
Vestre Rosten 81, N-7075 Tiller, Norway -
Crystal parallel resonant frequency
Crystal parallel equivalent capacitance
Crystal equivalent series resistance
Total crystal load capacitance, including capacitance in PCB
layout.
PCB1
and C
PCB2
Page 9 of 18
PCB1
are the layout parasitic capacitance on the
and C2´ = C2 + C
Part. no., 22 nH inductors, 0603
size
PE-0603CD220GTT
0603CS-22NXGBC
LQW1608A22NG00
0603G220GTE
KQ0603TE22NG
Phone [phone] - Fax [phone]
PCB2
May 2000