Radio Receiver based XE1218 single chip 230MHz Author Gael Goron

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Radio Receiver based XE1218 single chip 230MHz Author Gael Goron

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AN1218.01 Application Note
Radio Receiver based XE1218 single chip 230MHz
Author Gael Goron further information, please contact
XEMICS
mail: xemics@xemics.com Web: www.xemics.com
INTRODUCTION
XE1218 BENEFITS
RD1218-01 OVERVIEW.3
RD1201.01 FEATURES.3
SYSTEM OVERVIEW
SYSTEM DETAILLED.5 POWER SUPPLY AUDIO OUTPUTS AUDIO OUTPUT LEVEL CONTROL ANTENNA CIRCUIT.5
ELECTRICAL SCHEMATIC MODULE
GENERAL SPECIFICATION
LIST SYMBOLS CONNECTIONS
BILL MATERIAL
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Introduction
This reference design reports RD1218.01 Radio Receiver demonstrates highly integrated single chip audio receiver from antenna loudspeaker voice transmission applications. details about Single Chip 230MHz Receiver, refer XE1218 Data sheet. Traditionally, Receiver includes high complexity design simplified highly integrated single chip receiver. XEMICS XE1218 Receiver ultra voltage operation down volt ultra power consumption, 2mA. sensitivity been designed order obtain -107dBm with 6kHz audio bandwidth. XE1218 circuit includes receiver section, demodulator directly connecting audio amplifier that fits external earpiece. uses analog narrow-band modulation. Based power-IF architecture, XE1218 receiver designed with on-chip channel filter delay line type demodulator. Moreover, crystal oscillator generates Local Oscillator frequency that therefore fixed between 130MHz-230MHz.
Overview
Electronic module radio receiver. provides cost-effective circuit enabling receive audio signal from walky-talky. system operates power band 200MHz short-range devices. fixed frequency one-channel receiver. receiving frequency defined quartz, which soldered module. chosen 173-225MHz band. Europe, 173-225MHz band (formerly "VHF-II") recently been assigned short range radio communication equipment using power transmitter (for more information refer norm ETS300422). Typical applications using XE1218 design tour guide systems, wireless phone headsets, broadcasting miniature receivers, local/wide area voice paging toys. USA, 216-217MHz band freed 1996 Power Radio Service (LPRS) which includes auditory assistance devices, health care assistance devices enforcement tracking systems. maximum allowable transmitter power 100mW. electronic module that allows construction miniaturized radio receiver. supplied single 1.3V battery current consumption (1.5mA-3mA, depending mode).
XE1218 Benefits
XE1218 Receiver audio application offers following advantages: power consumption Highly integrated High sensitivity 6kHz audio bandwidth Integrated audio amplifier Very external components
Features
complexity hardware Small size short wire printed antenna Direct connection with loudspeaker Stand mode <50uA.
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System Overview
RD1218.01 Reference Design describes develop cost effective fully integrated Receiver. Using XE1218, this application performs signal reception Audio processing (antenna loudspeaker out). This Reference Design limited receive only frequency, which fixed quartz (see design modification change frequency). Ultra Power receiver, XE1218, composed following main functional blocks: Receiver Chain including audio output stage Local Oscillator block control service blocks. receiver implemented with following blocks: noise amplifier mixer used down converter transfer signal from band intermediate frequency (IF) 25kHz.
offset cancellation block used attenuate Filter chain used amplify filter signal. limiter providing demodulator with fully digital signals. digital delay line demodulator that converts signal from limiter into pulse width modulated signal twice frequency. This block also generates MUTE signals; signal used inside demodulator order track clock frequency frequency. audio stage used filter input signal provide volume control output buffering. block uses MUTE signal generated demodulator switch on/off output buffer driving output.
XE1218
Muting
Demodulator
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System Details
receiving frequency determined quartz frequency. receiver XE1218 super-heterodyne receiver having 25kHz. receiving frequencies that +-25kHz offset with respect quartz frequency. image frequency rejected, this simplification been made order achieve lowest current consumption. image frequency located very close receiving frequency, therefore probability interference, this image, other power transmitters remains low. antenna circuitry adjusted (Trimmer module), because depends chosen antenna type. Power Supply single 1.0-1.6V battery supplies receiver. battery shall connected between +Vdd GND. Audio Outputs module outputs each which serving different purposes: OUTL OUTH (not accessible with demonstrator) low-level outputs connection loudspeaker input. high level output. output class amplifier directly connected earphone.
Audio OUTL OUTH
Output Level 10mVrms ±3dB 40mVrms ±3dB 250mVrms ±3dB
Output Impedance <100, serie 4.7µF ±25%, serie Vbias=0.3V ±100mV
Recommended Load Impedance (earphone)>200
Audio Output Level Control Audio output level depends value resistor (see fig). default value 470kOhm. Antenna Circuit simplest receiving antenna short wire length (electrical antenna) possible magnetic LOOP antenna with square centimeter area. that case, coil must removed again bring whole antenna circuitry resonance frequency. magnetic antenna less sensitive de-tuning proximity body than electrical antenna.
Electrical Schematic Module
VREG
CTRIM3
VREG SC-HPF
XTAL
CTRIM2
CTRIMA
10/02/2000
Module XE1218
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General Specification
Parameter Type Modulation Alignment Range Switching Range Sensitivity Channel Selectivity Current Consumption
Specification dev=5kHz max. 173-225MHz channel receiver, (quartz controlled) SINAD>10dB Pin=-105dBm, mod=1kHz, dev=3kHz >50dB (@200kHz channel spacing) Stand-by mode<50µA Squelch active mode:1.5mA-2.1mA
Operating Range
Temperature
-10°to +55°C (extreme)
Audio Signal Frequency Range Spurious Emissions
100Hz 6kHz
45dB (mod=1kHz, dev=5kHz) below -57dBm
Symbol List connection
VREG OUTL OUTH AGND
Description Negative Supply (GND) Positive Supply Sense Input standby modus Earphone Output high level audio output Impedance Output hearing aids High Impedance output hearing aids Test Antenna input Antenna ground
OUTL
AGND
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Bill Material
Components Xtal Type Overtone crystal, Serial resonance Value F=171.525 Cs=0.17fF, Rs<120 Q>40000 Cp=3,2pF 0.15uH 0.18uH o.18uH 10pF 2.5pF 3.2pF 10pF 4.7uF 4.7uF 10uF 0-100k 2.2M
Ctrim1 Ctrim2 Ctrim3 C4,C5,C6
XEMICS, 2001 rights reserved. Reproduction whole part prohibited without prior written consent copyright owner. information presented this document does form part quotation contract, believed accurate reliable changed without notice. publisher consequence will accept liability. Publication thereof does convey imply license under patent- other industrial intellectual property rights
A0109-76

Radio Receiver based XE1218 single chip 230MHz Author Gael Goron

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