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TH71111
Receiver - 868/915MHz FSK/ASK, Single-Conversion Superhet (LQFP32)
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Download TH71111 Datasheet (PDF)
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TH71111 General Description
The TH71111 FSK/ASK single-conversion superheterodyne receiver IC is designed for applications in the European 868 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 800 MHz to 930 MHz (e.g. for applications according to FCC part 15).
TH71111 Features and Benefits
Single-conversion superhet architecture for low external component count
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
32-pin Low profile Quad Flat Package (LQFP)
TH71111 Related Products
Part Number
Description
EVB71111
Evaluation Board for TH71111
TH71111 Applications
Remote Controls
Alarm and Security Systems
Garage Door Openers
General Digital or Analog Data Receiving
Home and Building Automation
Low Power Telemetry Systems
Application Note
File Type
Size
Revision
Date
Action
Receiver Design Notes
PDF
87.1 KB
1/15/2004
TH71111 Documentation
DataSheet
File Type
Size
Revision
Date
Action
TH71111 DataSheet
PDF
457.5 KB
014
4/29/2008
Product flyers
File Type
Size
Revision
Date
Action
TH71111 Product Information
PDF
660.0 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
RF Receiver Topologies in Brief
PDF
33.8 KB
3/15/2006
Spec CDSCB10M7GA135_TH711xx
PDF
404.5 KB
6/29/2004
Test Data CDSCB10M7GA135_test
PDF
167.9 KB
6/29/2004
TH71111 Tools
TH71111 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Package Material Declaration - LQFP32 LF - S2
PDF
99.0 KB
6.0
1/25/2012
RoHS Compliance Declaration TH71111
PDF
37.5 KB
1.0
11/19/2009
This text will be replaced
TH71111 In The Press
TH71111 Frequently asked Questions
Receiver for RFID application
Question
I am in the process of building an UHF (915 MHZ) RFID reader. I was reading through the TH71111 receiver and read that it is "Well suited for NRZ, Manchester and similar codes". The tags we will be using will backscatter FM0 (Bi-Phase Space) coded signals. Will this receiver be able to decode this signal, or even just demodulate the signal to baseband and we can use a dsp chip or similar to decode the base band signal.
Answer
the TH71111 uses an average slicing method for extracting the data from the demodulator output. This is well suited for DC-free codes. Since the FM0 code inverses its baseband phase at every symbol boundary it should be no problem. The TH71111 RF receiver can be configured to receive ASK information up to 260kbit/s. This is enough to decode the FM0 signal from the UHF TAG at 80kbit/s (because of bi-phase encoding). Nevertheless, an external treatment must be done to remove the bi-phase encoding. Another RF transmitter is required to generate the field to power the UHF transponder. As a receiver the TH71111 cannot be used to generate such a field. Please reduce a bit the RSSI output low pass capacitor C16 (200pF instead of 1.5nF) to work with high data rate.
RFID 915 Mhz
Answer
The problem with UHF RFID readers is the requirement for a very large dynamic range of the receiver because the transmitted signal is large and is present when the receiver is operating. This usually requires a passive mixer or an active one operating at a realtively high current. If you can find a way to reduce the signal level, you might be able to use the RSSI output of our TH71111 or TH71112 receivers.
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