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TH72036KLD 参数 Datasheet PDF下载

TH72036KLD图片预览
型号: TH72036KLD
PDF下载: 下载PDF文件 查看货源
内容描述: 868 / 915MHz的FSK / ASK发送器 [868/915MHz FSK/ASK Transmitter]
分类和应用:
文件页数/大小: 16 页 / 336 K
品牌: MELEXIS [ Melexis Microelectronic Systems ]
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TH72036  
868/915MHz  
FSK/ASK Transmitter  
1 Theory of Operation  
1.1 General  
As depicted in Fig.1, the TH72036 transmitter consists of a fully integrated voltage-controlled oscillator  
(VCO), a divide-by-32 divider (div32), a phase-frequency detector (PFD) and a charge pump (CP). An inter-  
nal loop filter determines the dynamic behavior of the PLL and suppresses reference spurious signals. A  
Colpitts crystal oscillator (XOSC) is used as the reference oscillator of a phase-locked loop (PLL) synthe-  
sizer. The VCO’s output signal feeds the power amplifier (PA). The RF signal power Pout can be adjusted in  
four steps from Pout = –11 dBm to +9.5 dBm, either by changing the value of resistor RPS or by varying the  
voltage VPS at pin PSEL. The open-collector output (OUT) can be used either to directly drive a loop antenna  
or to be matched to a 50Ohm load. Bandgap biasing ensures stable operation of the IC at a power supply  
range of 1.95 V to 5.5 V.  
1.2 Block Diagram  
RPS  
R1  
ASKDTA  
CKDIV  
PSEL  
VCC  
10  
7
6
PLL  
CKOUT  
ROI  
div 8  
div 32  
antenna  
matching  
network  
8
OUT  
5
3
32  
PA  
PFD  
CP  
XOSC  
XBUF  
VCO  
4
mode  
control  
XTAL  
FSKSW  
ENTX  
2
CX2  
CX1  
1
9
FSKDTA  
VEE  
Fig. 1: Block diagram with external components  
2 Functional Description  
2.1 Crystal Oscillator  
A Colpitts crystal oscillator with integrated functional capacitors is used as the reference oscillator for the PLL  
synthesizer. The equivalent input capacitance CRO offered by the crystal oscillator input pin ROI is about  
18pF. The crystal oscillator is provided with an amplitude control loop in order to have a very stable fre-  
quency over the specified supply voltage and temperature range in combination with a short start-up time.  
3901072036  
Rev. 005  
Page 3 of 16  
Data Sheet  
June/07