參數資料
型號: MICRF112YMM TR
廠商: Micrel Inc
文件頁數: 14/20頁
文件大小: 550K
描述: IC XMITTER UHF ASK/FSK 10-MSOP
標準包裝: 2,500
頻率: 300MHz ~ 450MHz
應用: RKE
調制或協(xié)議: ASK,OOK
數據傳輸率 - 最大: 50 kbps
功率 - 輸出: 10dBm
電流 - 傳輸: 12.3mA
數據接口: PCB,表面貼裝
天線連接器: PCB,表面貼裝
電源電壓: 1.8 V ~ 3.6 V
工作溫度: -40°C ~ 125°C
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
包裝: 帶卷 (TR)
其它名稱: MICRF112YMMTR
MICRF112YMMTR-ND
Micrel, Inc.
MICRF112
 
 
December 2011 
14
M9999-120911
(408) 944-0800
 
Application Information
 
Figure 6. ASK 433.92MHz and 315MHz
Note: Values in parenthesis are for 315MHz
 
The MICRF112 is well suited to drive a 50 ohms source,
monopole or a loop antenna. Figure 6 is an example of a
loop antenna configuration. Figure 6 also shows both
315MHz and 433.92MHz ASK configurations for a loop
antenna. Besides using a different crystal, Table 1 lists
modified values needed for the listed frequencies.
 
Frequency
(MHz)
L1
(nH)
C5
(pF)
L4
(nH)
C7
(p
F)
Y1 (MHz)
315.0
470
10
150
6.8
9.84375
433.92
680
10
82
4.7
13.5600
Table 1
 
The reference design shown in Figure 6 has an antenna
optimized for using the matching network as described in
Table 1.
Power Control Using External Resistor
R7 is used to adjust the RF output levels which may be
needed to meet compliance. As an example, the
following tables list typical values of conducted RF
output levels and corresponding R7 resistor values for
the 50& test board shown in Figure 2. R7 of the TX112
Demo board using the loop antenna can be adjusted for
the appropriate radiated field allowed by FCC or ETSI
compliance. Contact Micrel for suggested values to meet
FCC and ETSI compliances.
 
R7, &
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
Output Power Versus External Resistor at 315MHz
 
 R7, & 
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
Output Power Versus External Resistor at 433.92 MHz
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