EVB71112B-915-FSK-C

EVB71112B-915-FSK-C Datasheet

EVB71112

Part	Datasheet
EVB71112B-915-FSK-C	EVB71112B-915-FSK-C (pdf)

Related Parts	Information
EVB71112B-868-FSK-C	EVB71112B-868-FSK-C

PDF Datasheet Preview
EVB71112 868/915MHz 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 EVB71112-868-FSK EVB71112-868-ASK EVB71112-915-FSK EVB71112-915-ASK Application Examples ! General digital and analog 868 MHz or 915 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 TH71112 FSK/FM/ASK double-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 in the US 915 MHz ISM band . Page 1 of 14 EVB Description Feb./03 EVB71112 868/915MHz 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 EVB71112 868/915MHz Receiver Evaluation Board Description 1 Theory of Operation General With the TH71112 receiver chip, various circuit configurations can be arranged in order to meet a Demodulation Type of receiver 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 FM / FSK FM / FSK narrow-band RX with ceramic demodulation tank wide-band RX with LC demodulation tank configuration, the RSSI signal is feed to an ASK detector, which is constituted by the operational RX with RSSI-based demodulation amplifier. 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.

PDF Datasheet Preview

EVB71112
868/915MHz 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

EVB71112-868-FSK EVB71112-868-ASK

EVB71112-915-FSK EVB71112-915-ASK

Application Examples
! General digital and analog 868 MHz or 915 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 TH71112 FSK/FM/ASK double-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 in the US 915 MHz ISM band .

Page 1 of 14

EVB Description Feb./03

EVB71112
868/915MHz 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

EVB71112
868/915MHz Receiver Evaluation Board Description
1 Theory of Operation

General

With the TH71112 receiver chip, various circuit
configurations can be arranged in order to meet a Demodulation

Type of receiver
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

FM / FSK FM / FSK
narrow-band RX with ceramic demodulation tank
wide-band RX with LC demodulation tank
configuration, the RSSI signal is feed to an ASK detector, which is constituted by the operational

RX with RSSI-based demodulation
amplifier.

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.

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 EVB71112B-915-FSK-C Datasheet file may be downloaded here without warranties.

Datasheet ID: EVB71112B-915-FSK-C 647780