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MICRF112 데이터시트(PDF) 27 Page - Microchip Technology

부품명 MICRF112
상세설명  The MICRF112 is a high-performance, easy-to-use, true “Data-In, RF-Out”, ASK/FSK, Phase-Locked Loop (PLL)- based, transmitter IC for applications in the 300 MHz to 450 MHz frequency range.
PDF  46 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MICRF112 데이터시트(HTML) 27 Page - Microchip Technology

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MICRF112
Application Information
Data Sheet
© 2024 Microchip Technology Inc. and its subsidiaries
DS70005554A - 27
7.
Application Information
Figure 7-1. ASK 433.92 MHz and 315 MHz (MSOP)
Note: Values in parenthesis are for 315 MHz.
The MICRF112 is ideal for driving a 50Ω source monopole or a loop antenna. The above figure
is an example of a loop antenna configuration. It also illustrates both 315 MHz and 433.92 MHz
ASK configurations for a loop antenna. In addition to using a different crystal, modified values are
needed for certain frequencies. These are listed in the following table.
Table 7-1. Modified Frequency Values
Frequency (MHz)
L1 (nH)
C5 (pF)
L4 (nH)
C7 (pF)
Y1 (MHz)
315.0
470
10
150
4.7
9.84375
433.92
470
10
82
3.9
13.5600
The reference design illustrated in Figure 7-1 has an antenna optimized for using the matching
network, as described in the above table
Power Control Using an External Resistor
R7 is used to adjust the RF output levels that may be needed to meet compliance. As an example,
Table 7-2 and Table 7-3 list typical values of conducted RF output levels and corresponding R7
resistor values for the 50Ω test board shown in the Test Circuit.
Table 7-2. ASK Output Power at 1 Kbps (Manchester) vs. External Resistor at 315 MHz
R7, Ω
Output Power, dBm
IDD, mA
0
10
6.7
75
8.5
6.3
100
8.0
6.2
500
1.6
4.13
1000
-3.8
4.87
Table 7-3. ASK Output Power at 1 Kbps (Manchester) vs. External Resistor at 433.92 MHz
R7, Ω
Output Power, dBm
IDD,mA
0
8.68
7.5
75
8.34
7.33
100
8.02
7.3
500
4.34
6.3
1000
0.42
5.5



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