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參數(shù)資料
| 型號： | MICRF102BM |
| 廠商： | MICREL INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | QwikRadio UHF ASK Transmitter |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 61K |
| 代理商： | MICRF102BM |
September 2002
9
MICRF102
MICRF102
Design Examples
Complete reference designs including gerber files can be
downloaded from Micrel
’
s website at www.micrel.com/prod-
uct-info/qwikradio.shtml.
Antenna Characteristics
In this design, the desired loop inductance value is deter-
mined according to the table below.
Micrel
Freq.
(MHz)
300
315
390
434
The reference design shown in Figure 6. has an antenna
meeting this requirement.
R
XL
Ind
(nH)
44.8
45.1
47.4
50.0
Q
K
(ohms) (ohms)
1.7
2.34
3.2
2.1
(XL/R)
39.72
39.65
52.00
78.33
84.5
89.3
161
136
0.83
0.85
0.90
0.96
Figure 6
Loop antennas are often considered highly directional. In fact
small loop antennas can achieve transmit patterns close in
performance to a Dipole antenna. The radiation pattern
below is the theoretical radiation pattern for the antenna
shown in Figure 6.
E-total, phi = 0
E-total, phi = 90
(180-phi) direction
phi direction
30.0
180.0
60.0
120.0
150.0
150.0
120.0
60.0
30.0
0.0
Figure 7. Polar Elevation pattern at 315MHz
The 0 degree plot is the radiation pattern in the plane of the
transmitter PCB, the 90 degree plot represents the plane
perpendicular to the PCB. Micrel
’
s evaluation of the perfor-
mance of the board in Figure 6. indicates an even more
uniform radiation pattern that the theoretical plot shown here.
Supply Bypassing
Supply bypassing consists of three capacitors; C3 = 4.7uF,
C4 = 0.1uFand C5 = 100pF
C4
0.1 F
16V
C5
100pF
50V
C3
4.7 F
16V
+5VTX
VDD
V
SS
MICRF102BM
2
3
PC
1
ASK
8
ANTP
7
ANTM
6
SB
5
REFOSC
4
Figure 8.
Example to Calculate C
S
and C
P
Antenna Inductance Calculation
Length_mils = 2815
dmils = 70
k = 0.85
Length
Length_mils
(
25.4
1000
Length
71.501
=
=
×
)
d
dmils
d
=
×
(
)
=
25 4
1000
1 778
.
.
L
0.2 Length lnLength
d
1.6
10
k
L
44 10
9
9
=
×
=
Where Length and d are in mm and L is in H;
Where k is a constant dependent on pcb material, copper
thickness, etc
MICRF102 Series Capacitor Calculation
f = 315
×
10
6
L = 46
×
10
-9
C
VAR
= 5
×
10
-12
C
P
= 12
×
10
-12
C
l
×
f
L
C
T
T
=
×
×
=
4
5 55 10
.
2
2
12
π
C
C
8 2 10
12
.
C
C
SERIES
T
VAR
SERIES
=
=
1
1
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MICRF102BM TR | 功能描述:IC TRANSMITTER ASK UHF 8-SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 發(fā)射器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應(yīng)用:- 調(diào)制或協(xié)議:UHF，ASK 數(shù)據(jù)傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數(shù)據(jù)接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲容量:- 特點(diǎn):- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| MICRF102YM | 功能描述:射頻發(fā)射器 300-460MHz, 5V Transmitter( Lead Free) RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
| MICRF102YM TR | 功能描述:射頻發(fā)射器 300-460MHz, 5V Transmitter( Lead Free) RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
| MICRF103 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:QwikRadio UHF ASK Transmitter |
| MICRF103BM | 功能描述:IC ASK TRANSMITTER UHF 8SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 發(fā)射器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應(yīng)用:- 調(diào)制或協(xié)議:UHF，ASK 數(shù)據(jù)傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數(shù)據(jù)接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲容量:- 特點(diǎn):- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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