TH72032KDC Melexis Inc, TH72032KDC Datasheet - Page 3
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TH72032KDC
Manufacturer Part Number
TH72032KDC
Description
TRANSMITTER ASK SOIC8
Manufacturer
Melexis Inc
Datasheet
1.TH72032KDC.pdf
(20 pages)
Specifications of TH72032KDC
Frequency
868MHz, 915MHz
Modulation Or Protocol
ASK
Data Rate - Maximum
40 kbps
Power - Output
9dBm
Current - Transmitting
13.4mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Voltage - Supply
1.95 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Applications
-
Memory Size
-
Other names
Q4689527
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TH72032KDC-BAA-000-RE
Manufacturer:
MELEXIS/迈来芯
Quantity:
20 000
1 Theory of Operation
1.1 General
As depicted in Fig.1, the TH72032 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 P
four steps from P
voltage V
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
3901072032
Rev. 009
CX1
XTAL
PS
ENTX
at pin PSEL. The open-collector output (OUT) can be used either to directly drive a loop antenna
ROI
out
4
3
2
= –12 dBm to +9.5 dBm, either by changing the value of resistor RPS or by varying the
XOSC
control
mode
Fig. 1:
XBUF
8
VEE
Block diagram with external components
PLL
PFD
CP
32
Page 3 of 20
VCC
VCO
6
RPS
PSEL
detector
voltage
PA
5
low
ASKDTA
1
7
ASK Transmitter
OUT
TH72032
out
can be adjusted in
868/915MHz
matching
antenna
network
Data Sheet
March/08