EVB71101B-315-FSK-C

EVB71101B-315-FSK-C Datasheet

EVB71101

Part	Datasheet
EVB71101B-315-FSK-C	EVB71101B-315-FSK-C (pdf)

Related Parts	Information
EVB71101B-433-FSK-C	EVB71101B-433-FSK-C

PDF Datasheet Preview
EVB71101 315/433MHz Receiver Evaluation Board Description ! Single superhet architecture for low external component count ! 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 EVB71101-433-FSK EVB71101-433-ASK EVB71101-315-FSK EVB71101-315-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 TH71101 FSK/FM/ASK single-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 EVB71101 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 EVB71101 315/433MHz Receiver Evaluation Board Description 1 Theory of Operation General With the TH71101 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 FSK / FM narrow-band RX with ceramic demodulation tank FSK / FM wide-band RX with LC demodulation tank RX with RSSI-based demodulation A double-conversion variant, called TH71102, is also available. This receiver IC allows a higher degree of image rejection, achieved in conjunction with an RF front-end filter. Both RXICs have the same die. At the TH71102, the second mixer MIX2 is used to down-convert the first IF IF1 to the second IF IF2 . At the TH71101, MIX2 operates as an amplifier. 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. The TH71101 receiver IC consists of the following building blocks: " PLL synthesizer PLL SYNTH for generation of the local oscillator signal LO " Parts of the PLL SYNTH are the high-frequency VCO1, the feedback divider DIV_16, 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 IF " IF pre amplifier which is a mixer cell MIX2 that operates as an amplifier " IF amplifier IFA to amplify and limit the IF 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

EVB71101
315/433MHz Receiver Evaluation Board Description
! Single superhet architecture for low external component count ! 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

EVB71101-433-FSK EVB71101-433-ASK

EVB71101-315-FSK EVB71101-315-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 TH71101 FSK/FM/ASK single-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

EVB71101
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

EVB71101
315/433MHz Receiver Evaluation Board Description
1 Theory of Operation

General

With the TH71101 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

FSK / FM
narrow-band RX with ceramic demodulation tank

FSK / FM
wide-band RX with LC demodulation tank

RX with RSSI-based demodulation

A double-conversion variant, called TH71102, is also available. This receiver IC allows a higher degree of image rejection, achieved in conjunction with an RF front-end filter. Both RXICs have the same die. At the TH71102, the second mixer MIX2 is used to down-convert the first IF IF1 to the second IF IF2 . At the TH71101, MIX2 operates as an amplifier.

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.

The TH71101 receiver IC consists of the following building blocks:
" PLL synthesizer PLL SYNTH for generation of the local oscillator signal LO " Parts of the PLL SYNTH are the high-frequency VCO1, the feedback divider DIV_16,
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 IF " IF pre amplifier which is a mixer cell MIX2 that operates as an amplifier " IF amplifier IFA to amplify and limit the IF 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 EVB71101B-315-FSK-C Datasheet file may be downloaded here without warranties.

Datasheet ID: EVB71101B-315-FSK-C 647777