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参数资料
| 型号： | EVB72031 |
| 英文描述： | EVB72031 EValuation Board TH72031 |
| 中文描述： | EVB72031评估板TH72031 |
| 文件页数： | 6/12页 |
| 文件大小： | 307K |
| 代理商： | EVB72031 |
EVB72001
315MHz FSK Transmitter
Evaluation Board Description
390127200101
Page 3 of 12
EVB Description
Rev. 002
Oct/02
PR
EL
IM
INA
RY
1 Theory of Operation
1.1
General
As depicted in Fig.1, the TH72001 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
internal 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)
synthesizer. The VCO’s output signal feeds the power amplifier (PA). The RF signal power Pout can be
adjusted in four steps from Pout = –15 dBm to +6 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 1.9 V to 5.5 V.
1.2
Block Diagram
Fig. 1: Block diagram with external components
VEE
XOSC
PA
XBUF
VCO
PLL
CP
PFD
32
PSEL
RPS
ROI
XTAL
8
5
3
2
antenna
matching
network
OUT
7
CX1
1
ASKDTA
6
VCC
mode
control
ENTX
4
low
voltage
detector
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