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EVB71102
Evaluation Board for TH71102
 Download EVB71102 Datasheet (PDF)
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EVB71102 General Description
The TH71102 FSK/ASK double-conversion superheterodyne receiver IC is designed for applications in the European 433 MHz industrial-scientific-medical (ISM) band, according to the EN 300 220 telecommunications standard. It can also be used for any other system with carrier frequencies ranging from 260 MHz to 510 MHz (e.g. for applications according to FCC part 15 and ARIB STD-T67).
EVB71102 Features and Benefits
- Double-conversion superhet architecture for high degree of image rejection
- FSK demodulation with phase-coincidence demodulator
- Low current consumption in active mode and very low standby current
- Switchable LNA gain for improved dynamic range
- RSSI allows signal strength indication and ASK detection
- Surface mount package LQFP32
EVB71102 Environmental Information
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EVB71102 Frequently asked Questions
EVB71102
Question
I have the EVB71102 and want to use it for wide band FM (200KHz) with good linearity (+-5%), what are the changes that I have to do at the EVB?
EVB71102 external Reference frequency
Question
I need to connect my EVB71102 pin26 to external reference frequency, according the Manuel I need to put C_RO=330pF.
What is the input impedance in this case?, cause I didn't find pin26 input impedance.
If I want to connect 50 ohm signal generator, what is the changes that I need to do?
TH72011
Answer
for the center frequency of 433.92MHz we use for the
1. EVB72011 the 13.56MHz crystal from ECS (www.ecsxtal.com), part no. ECS-135.600-CD-0374
2. EVB71102 the 23,5122MHz crystal from ECS (www.ecsxtal.com), part no. ECS-235.122-CD-0378
pls. not that these crystals are specified for temperature range -10..70C°. Of course the crystals should work also outside this specified range without any abrupt malfunction, but the frequency tolerance would be higher than normal (20ppm). Currently we evaluate some other crystals from Telcona (www.telcona.com). Please feel free to talk to them about your requirements.
TH71102 Xtal cannot oscillate
Question
My evaluation board evb71102 , TH71102 was
faulty , after change the IC ,measure the XTAL RO pin26 ,no oscillation , check ENRX pin is high ,total supply current is 8mA @5V,use ASK
circuit , OUT_OA have some noise pulse , the RO pin26
is 4.8V @ supply 5V
,check Xtal OK ,PIN27 5v ,PIN25 0v
it ssem like RO voltage have problem ?please advise
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