EM2420-STR Ember, EM2420-STR Datasheet - Page 53

• Manufacturer Part Number: EM2420-STR
• Description: IC RF TXRX ZIGBEE 2.4GHZ 48-QLP
• Manufacturer: Ember

Specifications of EM2420-STR

• Mfg Application Notes: EM2420
• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: ZigBee™
• Power - Output: -3dBm
• Sensitivity: -94dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 19.7mA
• Current - Transmitting: 17.4mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QLP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -

Modulated spectrum
The
generator that can generate pseudo
random
generator. This is enabled by setting
MDMCTRL1.TX_MODE to 3 and issuing a
STXON command strobe. The modulated
spectrum is then available on the RF pins.
The low byte of the CRC word is
transmitted and the CRC is updated with
0xFF for each new byte. The length of the
transmitted data sequence is 65535 bits.
The transmitted data-sequence is then:
[synchronization header] [0x00, 0x78,
0xb8, 0x4b, 0x99, 0xc3, 0xe9, …]
Since a synchronization header (preamble
and SFD) is transmitted in all TX modes,
this test mode may also be used to
transmit a known pseudo-random bit
Date:
Ember Part Number: 120-0049-000D
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
Ref Lvl
Ref Lvl
EM2420
Center 2.45 GHz
1AVG
0 dBm
0 dBm
sequence
23.OCT.2003
has a built-in test pattern
using
21:34:19
Figure 30. Modulated spectrum plot
the
CRC
EM2420 Datasheet
1 MHz/
sequence for bit error testing. Please note
that
synchronization,
synchronization, for correct reception.
Packet error rate is therefore a better
measurement
performance.
Another option to generate a modulated
spectrum is to fill the TXFIFO with pseudo-
random
MDMCTRL1.TX_MODE to 2. The
then
disregarding a TXFIFO underflow. The
length of the transmitted data sequence is
then 1024 bits (128 bytes).
A plot of the modulated spectrum from the
EM2420
find the output power from the modulated
spectrum, the RBW must be set to 3 MHz
or higher.
RBW
VBW
SWT
transmit
the
100 kHz
100 kHz
is shown in Figure 30. Note that to
5 ms
EM2420
data
data
for
RF Att
Unit
not
requires
EM2420
the
from
Span 10 MHz
and
only
30 dB
Page 53 of 84
true
EM2420
the
dBm
symbol
FIFO
1SA
will
A
RF
set
bit