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© Semiconductor Components Industries, LLC, 2016
July, 2016 - Rev. 3
1 Publication Order Number:
AND9318/D
AND9318/D
AX5051 Use in Compliance
with ETSI EN 300 220-1
Introduction
All measurements are executed conducted. The
measurements are performed on the AX5051 DVK2b
module. It is not the aim to measure an antenna performance.
Devices are set up using the AXGen2−RadioLab
software.
Identical results can be obtained for AX5151, AX5031,
AX5131 and AX8052F151.
Receive
Receivers of ETSI EN 300 220−1 V2.4.1 (2012−05)
Categories 2 or 3 can be built using AX5051. Please refer to
the datasheet for the relevant sensitivity and blocking
values.
Transmit
The following table lists output power levels for GFSK
modulated signals that can pass ETSI EN 300 220−1 V2.4.1
(2012−05) as a function of the bitrate and the reference
crystal frequency. In the following chapters of this
application note, detailed measurements for 50 kbps GFSK
using a 16 MHz crystal and 100 kbps GFSK using a 24 MHz
crystal are presented.
Table 1. TYPICAL OUTPUT POWER LEVELS FOR
GFSK, h = 0.67 MODULATED SIGNALS THAT CAN
PASS ETSI EN 300 220−1 V2.4.1 (2012−05) IN THE
FREQUENCY BAND 868.0 − 868.6 MHz (WIDE BAND)
Bitrate
GFSK with
h = 0.67
Crystal
Frequency
Typical Output Level
Passes ETSI EN 300 220−1
V2.4.1 (2012−05) in the frequen-
cy band 868.0 − 868.6 MHz
(wide band)
50 kbps
16 MHz
14 dBm
100 kbps 8 dBm
200 kbps 5 dBm
100 kbps
24 MHz
14 dBm
200 kbps 12 dBm
300 kbps 7 dBm
Measurements
General
• Frequency Error ETSI EN 300 220−1 V2.4.1
(2012−05), Sub−clause 7.1
The frequency error of the AX5051 is given by the
frequency error of the frequency source XTAL or TCXO.
ETSI EN 300 220−1 requirements are
± 100 ppm for 868 MHz wide band systems,
± 14.4 ppm for 868 MHz narrow band systems,
± 27 ppm for 433 MHz narrow band systems,
± 59 ppm for 169 MHZ narrow band systems.
Narrow band refers to channel widths smaller ≤ 25 kHz.
EN 13 757−4 2005 which applies for wireless M−Bus
devices, requires stricter frequency errors. 60 or 25 ppm for
the center frequency.
Although this is all achievable with normal crystals, we do
recommend use of a TCXO for optimal performance in
narrow band systems.
868 MHz Wide Band, 100 kbps, GFSK
ETSI EN 300 220−1 V2.4.1 (2012−05), in frequency band
868.0 − 868.6 MHz.
• Setup
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APPLICATION NOTE
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