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參數(shù)資料
| 型號： | KESTX0 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | 400MHz - 460MHz ASK Transmitter |
| 中文描述： | 400MHz的- 460MHz ASK發(fā)射 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 266K |
| 代理商： | KESTX0 |
6
KESTX01
Rp = (Rs+ Rr)(Q
2
+ 1)
For example, Ls=40nH, fo=433MHz, (Rs+Rr)=2.2
,
Q=50, gives an equivalent parallel resistance of 5.4k
.
Typically the antenna will be d.c. referenced to V
CC
as
shown in the applications diagram. The maximum voltage
swing across the antenna is therefore limited by the RF
saturation voltage of the output PA stage. This is of the order
of 0.5V and hence the peak to peak voltage across the
antenna will be 2*(V
CC
–0.5V) e.g. 9V for V
CC
=5V. This means
that the maximum current that can be driven into the load is
1.7mA (peak–peak at the fundamental) and the external
power control resistor should be set accordingly.
If it is necessary to drive more power into the antenna a
possible way to accomplish this is to perform an impedance
transformation to the antenna.
The antenna also acts as a filter for unwanted, out of band,
harmonic spurii. The use of a balanced output suppresses the
2nd harmonic (and other even order harmonics). The 3rd
harmonic of the fundamental is not automatically suppressed.
However even a Q as low as 10 will reduce the 3rd harmonic
by a further 32dB relative to the fundamental.
Figure 5 Loop antenna
Note: The above application diagram is provided to assist the customer in using the IC and no guarantee can be made as to
its correctness.
Figure 6 Application diagram
Rr
Rs
Lant
Ct
Rp
Lant
Ct
1
14
2
3
4
5
6
7
13
12
11
10
9
8
C2
R2
C3
VCC
X1
VEE2
C1
VCC
ANTENNA
ASK MODULATION
VCCPA
R1
POWER UP
VEE1
VEE1
C4
C5
L1
L2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| KESTX01IG | 400MHz - 460MHz ASK Transmitter |
| KESTX01MPAD | 400MHz - 460MHz ASK Transmitter |
| KESTX01MPAS | 400MHz - 460MHz ASK Transmitter |
| KF139 | SPECIFICATIONS FOR SAW FILTER(BAND PASS FILTERS FOR THE RECEIVING RF CIRCUITS OF PAGER) |
| KF139S | SPECIFICATIONS FOR SAW FILTER(BAND PASS FILTERS FOR THE RECEIVING RF CIRCUITS OF PAGER) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KESTX01IG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:400MHz - 460MHz ASK Transmitter |
| KESTX01MPAD | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:400MHz - 460MHz ASK Transmitter |
| KESTX01MPAS | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:400MHz - 460MHz ASK Transmitter |
| KESTX02A/IG/MPAS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: |
| KET 1234 | 制造商:EUCHNER 功能描述:JOYSTICK SWITCH |
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