TH71112ENE-BAA-000-TR

TH71112ENE-BAA-000-TR Datasheet

TH71112

Part	Datasheet
TH71112ENE-BAA-000-TR	TH71112ENE-BAA-000-TR (pdf)

Related Parts	Information
TH71112ENE-BAA-000-RE	TH71112ENE-BAA-000-RE

PDF Datasheet Preview
TH71112 868/915MHz FSK/FM/ASK Receiver ! Double superhet architecture for high degree of image rejection ! FSK for digital data and FM reception for analog signal transmission ! FM/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 Ordering Information Part No. TH71112 Temperature Range -40 °C to 85°C Package LQFP32 Application Examples ! General digital and analog 868 MHz or 915 MHz ISM band usage ! Low-power telemetry ! Alarm and security systems ! Keyless car and central locking ! Pagers Technical Data Overview ! Input frequency range 800 MHz to 930 MHz ! Power supply range V to V ! Temperature range -40 °C to +85 °C ! Operating current mA at low gain and mA at high gain mode ! Standby current < 100 nA ! Sensitivity -109 dBm 1 with 40 kHz second IF filter BW incl. SAW front-end filter loss ! Sensitivity -102 dBm 2 with 150 kHz second IF filter BW incl. SAW front-end filter loss ! Range of first IF 10 MHz to 80 MHz ! Range of second IF 455 kHz to MHz ! Maximum input level dBm at ASK and 0 dBm at FSK ! Image rejection > 65 dB e.g. with SAW front-end filter and at MHz 2nd IF ! Spurious emission < -70 dBm ! Input frequency acceptance ±50 kHz with AFC option ! RSSI range 70 dB ! Frequency deviation range ±5 kHz to ±120 kHz ! Maximum data rate 80 kbit/s NRZ ! Maximum analog modulation frequency 15 kHz 1 at ± 8 kHz FSK deviation, BER = and phase-coincidence demodulation 2 at ± 50 kHz FSK deviation, BER = and phase-coincidence demodulation TH71112 Data Sheet 3901071112 Page 1 of 20 TH71112 868/915MHz FSK/FM/ASK Receiver The TH71112 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_16 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 IF1 " second mixer MIX2 for down-conversion of the IF1 to the second IF IF2 " 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 With the TH71112 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 FM / FSK FM / FSK ASK Type of receiver narrow-band RX with ceramic demodulation tank 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 frontend filter. Efficient RF frontend 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 TH71111, is also available. Both RXICs have the same die. At the TH71111 the second mixer MIX2 operates as an amplifier. TH71112 Data Sheet 3901071112 Page 2 of 20 Block Diagram TH71112 868/915MHz FSK/FM/ASK Receiver OUTP OUTN OA OAN OUT_OA RO 26 RO CP 29 LF IN_DEM OUT_IFA RSSI FPC2 FBC1 IN_IFA VEE_IF OUT_MIX2 VCC_MIX IF1N IF1P VEE_MIX IN_MIX1 OUT_LNA GAIN_LNA VEE_LNAC MIX1 MIX2 MIX3 BIAS DIV_16 VCO1

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TH71112
868/915MHz FSK/FM/ASK Receiver
! Double superhet architecture for high degree of image rejection ! FSK for digital data and FM reception for analog signal transmission ! FM/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
Ordering Information Part No.

TH71112

Temperature Range -40 °C to 85°C

Package LQFP32

Application Examples
! General digital and analog 868 MHz or 915 MHz ISM band usage ! Low-power telemetry ! Alarm and security systems ! Keyless car and central locking ! Pagers

Technical Data Overview
! Input frequency range 800 MHz to 930 MHz ! Power supply range V to V ! Temperature range -40 °C to +85 °C ! Operating current mA at low gain and mA at high gain mode ! Standby current < 100 nA ! Sensitivity -109 dBm 1 with 40 kHz second IF filter BW incl. SAW front-end filter loss ! Sensitivity -102 dBm 2 with 150 kHz second IF filter BW incl. SAW front-end filter loss ! Range of first IF 10 MHz to 80 MHz ! Range of second IF 455 kHz to MHz ! Maximum input level dBm at ASK and 0 dBm at FSK ! Image rejection > 65 dB e.g. with SAW front-end filter and at MHz 2nd IF ! Spurious emission < -70 dBm ! Input frequency acceptance ±50 kHz with AFC option ! RSSI range 70 dB ! Frequency deviation range ±5 kHz to ±120 kHz ! Maximum data rate 80 kbit/s NRZ ! Maximum analog modulation frequency 15 kHz
1 at ± 8 kHz FSK deviation, BER = and phase-coincidence demodulation 2 at ± 50 kHz FSK deviation, BER = and phase-coincidence demodulation

TH71112 Data Sheet 3901071112

Page 1 of 20

TH71112
868/915MHz FSK/FM/ASK Receiver

The TH71112 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_16 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 IF1 " second mixer MIX2 for down-conversion of the IF1 to the second IF IF2 " 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

With the TH71112 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 FM / FSK FM / FSK ASK

Type of receiver narrow-band RX with ceramic demodulation tank 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 frontend filter. Efficient RF frontend 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 TH71111, is also available. Both RXICs have the same die. At the TH71111 the second mixer MIX2 operates as an amplifier.

TH71112 Data Sheet 3901071112

Page 2 of 20

Block Diagram

TH71112
868/915MHz FSK/FM/ASK Receiver

OUTP

OUTN

OA OAN

OUT_OA

RO 26 RO

CP 29 LF

IN_DEM

OUT_IFA

RSSI

FPC2 FBC1 IN_IFA VEE_IF OUT_MIX2 VCC_MIX IF1N IF1P

VEE_MIX IN_MIX1 OUT_LNA GAIN_LNA VEE_LNAC

MIX1

MIX2

MIX3 BIAS

DIV_16 VCO1

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Datasheet ID: TH71112ENE-BAA-000-TR 647814