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TH72002
Transmitter - 315MHz, ASK (SOIC8)
Description
Applications
Documents
Environmental
FAQ
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Download TH72002 Datasheet (PDF)
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TH72002 General Description
The TH72002 ASK transmitter IC is designed for applications in the 315 MHz industrial-scientific-medical (ISM) band. It can also be used for any other system with carrier frequencies ranging from 290 MHz to 350 MHz.
The transmitter's carrier frequency fc is determined by the frequency of the reference crystal fref. The integrated PLL synthesizer ensures that carrier frequencies, ranging from 290 MHz to 350 MHz, can be achieved. This is done by using a crystal with a reference frequency according to: fref = fc/N, where N = 32 is the PLL feedback divider ratio.
TH72002 Features and Benefits
Fully integrated PLL-stabilized VCO
Frequency range from 290 MHz to 350 MHz
Single-ended RF output
ASK achieved by on/off keying of internal power amplifier up to 40 kbit/s
Wide power supply range from 1.95 V to 5.5 V
Operating temperature range -40°C to +125°C
Very low standby current
On-chip low voltage detector
High over-all frequency accuracy
Adjustable output power range from -10 dBm to +11 dBm
Adjustable current consumption from 3.2 mA to 10.3 mA
Conforms to FCC part 15 and similar standards
8-pin Small Outline Integrated Circuit (SOIC)
TH72002 Related Products
Part Number
Description
EVB72005
Evaluation Board for TH72005, TH72001 and TH72002
TH72002 Applications
Remote Controls
Alarm and Security Systems
Garage Door Openers
Automated Meter Reading (AMR)
General Digital Data Tansmission
Home and Building Automation
Application Note
File Type
Size
Revision
Date
Action
PA Output Matching
PDF
114.5 KB
001
4/10/2006
TH72002 Documentation
DataSheet
File Type
Size
Revision
Date
Action
TH72002 DataSheet
PDF
881.3 KB
009
8/22/2011
Product flyers
File Type
Size
Revision
Date
Action
TH72002 Product Information
PDF
493.6 KB
02-07
2/27/2007
Reference
File Type
Size
Revision
Date
Action
RF Quick Reference
PDF
544.5 KB
Aug-2011
8/18/2011
TH72002 Tools
TH72002 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Green / Halogen Free Compliance Declaration TH72002
PDF
39.7 KB
1.0
10/13/2009
Package Material Declaration - SOIC8 GR - S2
PDF
97.8 KB
7.0
1/25/2012
This text will be replaced
TH72002 In The Press
TH72002 Frequently asked Questions
EVB72032 Antenna Gain
Answer
The loop dimensions are already given in the EVB description: http://www.melexis.com/prodfiles/evb72032_rev006.pdf . Nevertheless there are some postings and links regarding this issue: "TH72012: need more power" & "TH72002".
TH72002
Question
I am using the TH72002 transmitter for TPMS application and I am quite new in designing the microstrip antenna. Is there any details document in explaining how to calculate the antenna impedances and also determine the matching impedance capacitance and inductance? The Application Notes provide here is not so clear.
Question
Pls give me a instruction about the TH72002. We use the TH72002 in RKE.Because we don't use the mcu in the system,and we must concentrate the current consumption,how to control the ENTX.For example,I active the ENTX=1 always,how much is the current when we don't transmit signal.
Question
Can you give me a advice about TH72002 in the RKE application?In the system,no cpu.The input signal directly come from the keyword coding chip.How to control the ENTX? In the system,I use the HCS300 as the code chip and input the pwm signal to Th72002.Pls give me some advice how to decrease power consumption.Because I don't have a good way to control the ENTX.
Answer
I recommend a carefully reading of the data sheets. The power-up transmit timing of the HCS300 defines a 'TTD - transmit delay from button detect' which is min. 10ms. When you have a look on the TH72002 data sheet you can see a start-up time (ton) of typ. 1.2ms. So it's very easy to start the TX (ENTX) at same time as the button is pressed.
Question
I know these parameters.I want you give some advice about how to control the TH72002,Which signal in HCS300 can be used to control the ENTX.I can't use the push button signal to control it ,because it is wobble.
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