SX1223I073TRT Semtech, SX1223I073TRT Datasheet - Page 21

• Manufacturer Part Number: SX1223I073TRT
• Description: IC TX UHF 433/868/916 MHZ 24TQFN
• Manufacturer: Semtech

Specifications of SX1223I073TRT

• Frequency: 425 ~ 475MHz / 850 ~ 950MHz
• Applications: AMR, Home Automation, HQ Music and Data
• Modulation Or Protocol: FSK
• Data Rate - Maximum: 153.6 kbps
• Power - Output: 10dBm
• Current - Transmitting: 25.8mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-TQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Other names: SX1223I073TR

6
This section provides details of the recommended components values for the frequency dependant blocks of the
SX1223. Note that these values are dependent upon circuit layout and PCB structure.
6.1
The optimum load impedances for 10 dBm output power at the three main frequencies are given in the following
table.
The schematic of the recommended matching network at the output of the transmitter is given in Figure 9 on the
next page.
The
The typical component values of this matching circuit are given below.
© Semtech 2007
APPLICATION INFORMATION
MATCHING NETWORK OF THE TRANSMITTER
-section is used to provide harmonic filtering in order to satisfy FCC and ETSI regulations.
Table 33: Typical component values for the recommended matching network at the output of the transmitter
Name
CT1
CT2
CT3
CT4
LT1
PA optimum load
Table 32: Optimum load impedances for 10 dBm output power
Typical Value
for 434 MHz
6.8pF
22nH
10pF
10pF
1pF
Figure 9: Transmitter output network
434 MHz
19.4-j2.6
CT3
Typical Value
for 869 MHz
4.7 nH
6.8 pF
6.8 pF
15 pF
21
NC
LT1
CT2
869 MHz
23.5-j1
Typical Value
for 915 MHz
4.7 nH
6.8 pF
4.7 pF
33 pF
NC
915 MHz
23.5+j8
Tolerance
SX1223
5%
5%
5%
5%
5%
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SX1223