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RF2513 参数 Datasheet PDF下载

RF2513图片预览
型号: RF2513
PDF下载: 下载PDF文件 查看货源
内容描述: UHF发送器 [UHF TRANSMITTER]
分类和应用: 光电二极管
文件页数/大小: 14 页 / 323 K
品牌: RFMD [ RF MICRO DEVICES ]
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RF2513  
mended that pre-compliance testing be performed so  
that there are no surprises during final compliance  
testing. This will help keep the product development  
and release on schedule.  
1 + LBW τ2)2  
1 + LBW τ1)2  
τ1 KPD KVCO  
---- -----------------------------  
C1  
=
----------------------------------------  
ω2  
N
τ2  
LBW  
Working with a laboratory offers the benefit of years of  
compliance testing experience and familiarity with the  
regulatory issues. Also, the laboratory can often pro-  
vide feedback that will help the designer make the  
product compliant.  
τ2  
----  
τ1  
æ
è
ö
ø
C2 = C1  
– 1  
τ2  
------  
C2  
R2  
=
On the other hand, having a GTEM cell or an open air  
test site locally offers the designer the ability to rapidly  
determine whether or not design changes impact the  
product's compliance. Set-up of an open air test site  
and the associated calibration is not trivial. An alterna-  
tive is to use a GTEM test cell.  
As an example, consider a loop bandwidth of 50kHz, a  
phase margin of 45°, a divide ratio of 64, a KVCO of  
20MHz/V, and a KPD of 0.01592mA/2πrad. Time con-  
stant τ1 is 1.31848µs, time constant τ2 is 7.68468µs,  
C1 is 131.15pF, C2 is 633.26pF, and R2 is 12.14k.  
After the design has been completed and passes com-  
pliance testing, application will need to be made with  
the respective regulatory bodies for the geographic  
region in which the product will be operated to obtain  
final certifications.  
In order to perform these calculations, one will need to  
know the value of two constants, KVCO and KPD. KPD is  
calculated by dividing the charge pump current by 2π.  
For the RF2513, the charge pump current is 40µA.  
KVCO is best found empirically as it will change with  
Conclusions  
frequency and board parasitics. By briefly connecting  
pin 23 (LOOP FLT) to VCC and then to ground, the fre-  
quency tuning range of the VCO can be seen. Dividing  
the difference between these two frequencies by the  
difference in the voltage gives KVCO in MHz/V.  
The RF2513 is an FM/FSK UHF transmitter that fea-  
tures a phase-locked output. This device is suitable for  
use in a CFR Part 15.231 compliant product as well as  
a local oscillator signal source. Two examples of show-  
ing these applications have been provided. Further, the  
RF2513 is packaged in a low cost SSOP-24 plastic  
package and requires few external parts, thus making  
it suitable for low cost designs.  
The control lines provide an interface for connecting  
the device to a microcontroller or other signal generat-  
ing mechanism. The designer can treat pin 16 (MOD  
IN), pin 15 (DIV CTRL), pin 14 (MOD CTRL), pin 24  
(OSC SEL), and pin 7 (LVL ADJ) as control pins whose  
voltage level can be set.  
11  
General RF bypassing techniques must be observed  
to get the best performance. Choose capacitors such  
that they are series resonant near the frequency of  
operation.  
Board layout is always an area in which great care  
must be taken. The board material and thickness are  
used in calculating the RF line widths. The use of vias  
for connection to the ground plane allows one to con-  
nect to ground as close as possible to ground pins.  
When laying out the traces around the VCO, it is desir-  
able to keep the parasitics equal between the two legs.  
This will allow equal valued inductors to be used.  
Pre-compliance testing should be performed during  
the design process. This can be done with a GTEM cell  
or at a compliance testing laboratory. It is recom-  
11-30  
Rev B8 010509