EVB71102B-315-FSK-C

EVB71102B-315-FSK-C Datasheet

EVB71102

Part	Datasheet
EVB71102B-315-FSK-C	EVB71102B-315-FSK-C (pdf)

Related Parts	Information
EVB71102B-418-FSK-C	EVB71102B-418-FSK-C
EVB71102B-433-FSK-C	EVB71102B-433-FSK-C

PDF Datasheet Preview
EVB71102 315/433MHz Receiver Evaluation Board Description ! Double superhet architecture for high degree of image rejection ! FSK for digital data and FM reception for analog signal transmission ! FSK/FM 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 Ordering Information EVB71102-433-FSK EVB71102-433-ASK EVB71102-315-FSK EVB71102-315-ASK Application Examples ! General digital and analog 315 MHz or 433 MHz ISM band usage ! Low-power telemetry ! Alarm and security systems ! Remote Keyless Entry RKE ! Tire Pressure Monitoring System TPMS ! Garage door openers ! Home automation ! Pagers Evaluation Board The TH71102 FSK/FM/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 300 MHz to 450 MHz e.g. for applications in the US 315 MHz ISM band . Page 1 of 14 EVB Description Feb./03 EVB71102 315/433MHz Receiver Evaluation Board Description Document Content 1 Theory of General 3 Technical Data Overview 3 Block 4 Mode Configurations 4 LNA GAIN 4 Frequency Planning 5 Selected Frequency Plans 2 FSK Application Circuits PCB Top View for FSK 7 Board Component Values for FSK Fig. 8 3 ASK Application PCB Top View for ASK Reception 10 Board Component Values for ASK Fig. 11 4 Package Dimensions 5 Reliability Information 6 ESD Precautions 7 Disclaimer Page 2 of 14 EVB Description Feb./03 EVB71102 315/433MHz Receiver Evaluation Board Description 1 Theory of Operation General With the TH71102 receiver chip, various circuit configurations can be arranged in order to meet a number of different customer requirements. For FM/FSK reception the IF tank used in the phase coincidence demodulator can be constituted either by a ceramic resonator or an LC tank optionally with a varactor diode to create an AFC circuit . In ASK configuration, the RSSI signal is feed to an ASK detector, which is constituted by the operational amplifier. Demodulation Type of receiver FM / FSK narrow-band RX with ceramic demodulation tank FM / FSK wide-band RX with LC demodulation tank RX with RSSI-based demodulation The superheterodyne configuration is double conversion where MIX1 and MIX2 are driven by the internal local oscillator signals LO1 and LO2, respectively. This allows a high degree of image rejection, achieved in conjunction with an RF front-end filter. Efficient RF front-end filtering is realized by using a SAW, ceramic or helix filter in front of the LNA and by adding an LC filter at the LNA output. A single-conversion variant, called TH71101, is also available. Both Receiver ICs have the same die. At the TH71101 the second mixer MIX2 operates as an amplifier. The TH71102 receiver IC consists of the following building blocks: " PLL synthesizer PLL SYNTH for generation of the first and second local oscillator signals LO1 and LO2 " Parts of the PLL SYNTH are the high-frequency VCO1, the feedback dividers DIV_8 and DIV_2, a phase-frequency detector PFD with charge pump CP and a crystal-based reference oscillator RO " Low-noise amplifier LNA for high-sensitivity RF signal reception " First mixer MIX1 for down-conversion of the RF signal to the first IF IF1 " Second mixer MIX2 for down-conversion of the IF1 to the second IF IF2 " IF amplifier IFA to amplify and limit the IF2 signal and for RSSI generation " Phase coincidence demodulator DEMOD with third mixer MIX3 to demodulate the IF signal " Operational amplifier OA for data slicing, filtering and ASK detection " Bias circuitry for bandgap biasing and circuit shutdown Technical Data Overview

PDF Datasheet Preview

EVB71102
315/433MHz Receiver Evaluation Board Description
! Double superhet architecture for high degree of image rejection ! FSK for digital data and FM reception for analog signal transmission ! FSK/FM 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
Ordering Information

EVB71102-433-FSK EVB71102-433-ASK

EVB71102-315-FSK EVB71102-315-ASK

Application Examples
! General digital and analog 315 MHz or 433 MHz ISM band usage
! Low-power telemetry ! Alarm and security systems ! Remote Keyless Entry RKE ! Tire Pressure Monitoring System TPMS ! Garage door openers ! Home automation ! Pagers

Evaluation Board

The TH71102 FSK/FM/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 300 MHz to 450 MHz e.g. for applications in the US 315 MHz ISM band .

Page 1 of 14

EVB Description Feb./03

EVB71102
315/433MHz Receiver Evaluation Board Description

Document Content
1 Theory of General 3 Technical Data Overview 3 Block 4 Mode Configurations 4 LNA GAIN 4 Frequency Planning 5

Selected Frequency Plans
2 FSK Application Circuits PCB Top View for FSK 7 Board Component Values for FSK Fig. 8
3 ASK Application PCB Top View for ASK Reception 10 Board Component Values for ASK Fig. 11
4 Package Dimensions
5 Reliability Information
6 ESD Precautions
7 Disclaimer

Page 2 of 14

EVB Description Feb./03

EVB71102
315/433MHz Receiver Evaluation Board Description
1 Theory of Operation

General

With the TH71102 receiver chip, various circuit configurations can be arranged in order to meet a number of different customer requirements. For FM/FSK reception the IF tank used in the phase coincidence demodulator can be constituted either by a ceramic resonator or an LC tank optionally with a varactor diode to create an AFC circuit . In ASK configuration, the RSSI signal is feed to an ASK detector, which is constituted by the operational amplifier.

Demodulation

Type of receiver

FM / FSK
narrow-band RX with ceramic demodulation tank

FM / FSK
wide-band RX with LC demodulation tank

RX with RSSI-based demodulation

The superheterodyne configuration is double conversion where MIX1 and MIX2 are driven by the internal local oscillator signals LO1 and LO2, respectively. This allows a high degree of image rejection, achieved in conjunction with an RF front-end filter. Efficient RF front-end filtering is realized by using a SAW, ceramic or helix filter in front of the LNA and by adding an LC filter at the LNA output.

A single-conversion variant, called TH71101, is also available. Both Receiver ICs have the same die. At the TH71101 the second mixer MIX2 operates as an amplifier.

The TH71102 receiver IC consists of the following building blocks:
" PLL synthesizer PLL SYNTH for generation of the first and second local oscillator signals LO1 and LO2 " Parts of the PLL SYNTH are the high-frequency VCO1, the feedback dividers DIV_8 and DIV_2,
a phase-frequency detector PFD with charge pump CP and a crystal-based reference oscillator RO " Low-noise amplifier LNA for high-sensitivity RF signal reception " First mixer MIX1 for down-conversion of the RF signal to the first IF IF1 " Second mixer MIX2 for down-conversion of the IF1 to the second IF IF2 " IF amplifier IFA to amplify and limit the IF2 signal and for RSSI generation " Phase coincidence demodulator DEMOD with third mixer MIX3 to demodulate the IF signal " Operational amplifier OA for data slicing, filtering and ASK detection " Bias circuitry for bandgap biasing and circuit shutdown

Technical Data Overview

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived EVB71102B-315-FSK-C Datasheet file may be downloaded here without warranties.

Datasheet ID: EVB71102B-315-FSK-C 647778