VCCR VCCA VCCO DEMOD Audio XE1218A power

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VCCR VCCA VCCO DEMOD Audio XE1218A power

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Datasheet XE1218A: Power single receiver
VCCR
VCCA
VCCO
DEMOD
Audio
XE1218A
power single receiver
General Description
XE1218 single die, power, receiver operating band from 130MHz 230MHz. highly integrated architecture allows audio functions same die, whilst minimizing external components needed build complete application same time. XE1218A enables single chip, complete audio transmission solutions, where antenna feeds incoming signal directly into XE1218A amplified audio signal earphone directly from XE1218A's output. Flexibility been built into XE1218A: various different transmission channels selected, audio output also post processing circuit such sound de-emphasis external power amplifier. XE1218A optimized battery powered applications, operated directly lithium 1.5V battery cell.
Applications
Wireless phone headset Local area voice paging broadcasting miniature receiver Toys
Main features
Tuneable from 130MHz High reception sensitivity: -100dBm Integrated filtering voltage operation: down 1.1V power consumption: typical 2.5mA audio bandwidth audio Integrated earphone audio amplifier Line external audio amplifier Mute function
Ordering Information
Part Number XE1218AS000BF Temperature range -10°C 40°C Package Bare
Cool Solutions Wireless Connectivity
XEMICS e-mail: info@xemics.com web: www.xemics.com
Datasheet XE1218A: Power single receiver
Table Contents
Functional description 1.1General description 1.2RF front 1.3Audio stage Functional implementation Block diagram Operation overview Application example Electrical characteristics Absolute maximum ratings Recommended operating conditions electrical specifications Interconnections Bare coordinates XE1218A packaging TQFP44 pin-out Input output signal description Application information Recommended crystal oscillator Using impedance audio output Using high impedance line Recommended antenna
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Datasheet XE1218A: Power single receiver
Functional description
General description
XE1218A integrated receiver including necessary functions process modulated signal input deliver "speech quality" audio signal output. XE1218A designed maximum system simplicity thus requires only external components offer antenna audio functionality. XE1218A also offers design flexibility. direct connection earphone possible through EAR, this takes advantage internal audio power amplifier external audio amplifier, audio processing device connected (line out) pin.
front
signal received through antenna delivered integrated external matching circuit. architecture implemented down-convert incoming signal intermediate frequency (IF) 25kHz. This signal then filtered remove components equalized offer clean digital signal demodulator. demodulator uses digital delay line architecture convert signal pulse width modulated signal twice frequency. XE1218A integrated which used demodulator have clock frequency track frequency. 1.2.1 noise figure (NF) this block less than 6dB, antenna impedance range. 6dB, noise image frequency that rejected. sensitivity -100dBm (SINAD=10 fdev 3kHz). 1.2.2 Mixer, down-conversion down-conversion implemented Gilbert cell. This implementation uses does have provisions integrated image rejection. incoming audio channel will demodulated 25kHz. This that image frequency will located 50kHz will attenuated XE1218A's receiving circuitry. multi-channel operation within reception range several XE1218A receivers, recommended that various carrier frequencies spaced least 100kHz, better 200kHz. 1.2.3 offset cancellation, amplifier chain components attenuated off-set cancellation block. on-chip pass filter provides attenuation greater than 65dBm measured 100kHz 1.2.4 Demodulation circuitry demodulator converts signal from amplifier into pulse width modulated signal twice frequency. follow-on block generates track frequency. Proper tracking frequency necessary stability link XE1218A operates narrow band mode. 1.2.5 Crystal local oscillator local oscillator provides XE1218A's down-converter mixer with proper frequency: Flo. implemented with crystal oscillator working external crystal's overtone harmonic.
Audio stage
1.3.1 Audio processing XE1218A integrated audio processing circuitry filters input pulse width modulated (PWM) signal from demodulator provides different output feeds. necessary bias currents voltages this analog block on-chip, including voltage multiplier circuit. When incoming signal becomes low, signal noise ratio audio output decreases, which drastically reduces sound quality intelligibility. user convenience, mute function implemented audio section. When signal noise ratio output (typ. audio output shut down.
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Datasheet XE1218A: Power single receiver
1.3.2 Audio output stage integrated power amplifier (PA) allows direct connection earphone. Controlled external potentiometer (100k) maximum attenuation 10dB achievable output, 21.5dB with high impedance line (10k) available through OUT.
Functional implementation
Block diagram
VCCR
VCCA
VCCO
DEMOD
Audio
Line
XE1218
Xtal
Volume Control
Operation overview
While XE1218A single channel receiver, various fixed frequencies selected between 130MHz 230MHz. This achieved changing external front-end components: Xtal. XE1218A receiver connects antenna differential input: pins RFG. external components must tune circuit incoming carrier frequency. calculated tune oscillator desired incoming carrier frequency. Xtal selected according desired input carrier frequency, relaxes oscillator's factor insure greater reception stability. Reception sensitivity determined through LNA's external tank circuit: types audio outputs selected: (line out, output impedance) connect external audio processing circuit amplifier direct connection earphone. external used adjust volume through VOL. internal audio blocks each have their supply voltage well common VDD. Clean voltage must supplied each these supplies (VCCR, VCCA, VCCO VDD).
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Datasheet XE1218A: Power single receiver
Application example
tune above circuit carrier frequency 160.325MHz, following external components must implemented: 56nH-5% 12pF-5% 56nH-5% 10pF- 15pF-5% 180nH-5% 10nF-5% Xtal 120nH 22pF-5% value capacitors given here change slightly different PCBs. 6pF-5% 100k 160.325MHz Wire 40mm
Electrical characteristics
Absolute maximum ratings
Parameter Supply voltage Storage Temperature -0.3V -55°C 2.5V +125°C
Stress beyond those listed under absolute maximum ratings cause permanent damage XE1218 device. These stress ratings only, functional operation device these other condition beyond those under "recommended operating conditions" implied. Exposure "absolute maximum ratings" conditions extended periods affect device reliability.
Recommended operating conditions electrical specifications
General conditions: Temp 25°C, VDD= 1.3V, Carrier Frequency=160MHz, unless otherwise specified
Symbol
Description
Condition Electrical supply parameters
Typ.
Unit
TEMP RF-IN F-DEV LO-D
Power supply Supply current
Receiver without earphone enabled Operating temperature range Radio Frequency parameters Input range Maximum deviation incoming modulated signal Crystal ageing temperature drift accounted fmodulated 1kHz, fdev= 3kHz funwanted fRfin 100kHz fmodulated 1kHz, fdev= 3kHz 10dBm SINAD 10dB Audio parameters Fdev 3kHz Only relevant using direct earphone connection fmodulated= 1kHz, fdev 5kHz Rvol 100k -60dBm, 20kHz
Carrier frequency Deviation frequency Local Oscillator shift input sensitivity Adjacent channel rejection
-100
Audio Output bandwidth (typical) Audio distortion output (EAR)
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Datasheet XE1218A: Power single receiver
Symbol
Description
Condition Audio parameters cont. fmodulated= 1kHz, fdev 3kHz Rvol 100k -60dBm, 6kHz Only direct earphone connection (EAR) Impedance earphone that directly connects output
Typ.
Unit
DC-EAR Z-EAR
Audio output (EAR) voltage output External earphone impedance
1000
Interconnections
XE1218A delivered bare die. complete receiver functionality requires bond wire connections from level substrate (for functionality, wire bonds line connection). measures 21.8mm2 (4.9mm 4.45mm). prototyping purposes, XE1218A also available TQFP44 package, details next page.
Bare
4900
VCCA VCCO
4450µm
VCCR
Origin reference (0,0)
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Datasheet XE1218A: Power single receiver
coordinates
coordinates below referenced lower left corner (see picture above). reference center bond pad. name VCCR coordinates (µm) 145, 3569 145, 3391 145, 2843 145, 2664 145, 1944 145, 1765 145, 1283 145, 1105 name VCCA VCCO coordinates (µm) 145, 4166 4629, 4141 4629, 3962 4629, 3782 4629, 3526 4629, 3270 4629, 2323 4629, 1809 4629,
XE1218A packaging
following TQFP package currently qualified production volumes. serves solely prototyping purposes.
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Datasheet XE1218A: Power single receiver
TQFP44 pin-out
Only relevant signals listed below. other pins should remain N.C. (not connected) name VCCR number name VCCA VCCO number
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Datasheet XE1218A: Power single receiver
Input output signal description
Name Description Local oscillator tank Local oscillator tank Crystal oscillator connection Crystal oscillator connection signal input (differential RFG) signal ground (differential RFI) tank circuit Functionality integrated local oscillator used produce mixer frequency down convert incoming carrier frequency. This local oscillator requires external tank circuit, which must tuned select desired crystal overtone. crystal connected between pins inductance must parallel. incoming carrier frequency differential input (RFI RFG). best results, external capacitive impedance matching circuit required. external tank circuit optimize gain. resonance frequency this tank circuit must adjusted same incoming carrier frequency This supply voltage section XE1218A. must clean de-coupled properly. This supply voltage digital control circuitry XE1218A. must clean decoupled properly. This ground reference. VDD, VCCA VCCR referenced this pin. This supply voltage analog section XE1218A. must clean de-coupled properly. XE1218A audio circuitry requires internal voltage multiplier. This multiplier requires external capacitor connected This must connected This used when integrated use. external potentiometer (100k will allow varying volume output. 100k will give tuning range -10dB will equate -21.5dB High impedance audio output: impedance Earphone output, average 250mV, ±3dB, speaker impedance must between This only used when line (OUT) selected. additional de-coupling capacitor needed line best performance Type Analog Analog Analog Analog Analog Input Analog ground Analog
VCCR VCCA VCCO
Supply voltage circuitry Supply voltage digital circuitry Ground reference Supply voltage analog circuitry External capacitor voltage multiplier Supply audio circuitry Volume control
Analog supply Digital supply Digital ground Analog supply Analog Supply input Analog input
Line Earphone Audio de-coupling
Analog output Analog output Analog output
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Datasheet XE1218A: Power single receiver
Application information
Recommended crystal oscillator
recommended characteristics crystal used generating local oscillator frequency (LO) following: Supplier: Telequarz Type: HSLX5132 Frequency: 160.325 (7th overtone) Motional capacitance 0.15 Calibration tolerance Stability over temperature range: Ageing first year:
Using impedance audio output
XE1218A provides possible audio outputs: direct connection earphone high impedance line (10k). Should impedance output required interface with audio post processing stage, this output matched using output XE1218A. adaptation should follows:
impedance line
Using high impedance line
line used XE1218A interface analog audio post processing circuit such sound de-compounder external power amplifier, de-coupling capacitor must connected XE1218A. Please note that this capacitor only necessary when system uses connection. When internal amplifier used earphone directly connected output EAR, must remain connected.
4.7nF-5%
High impedance line (10k)
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Datasheet XE1218A: Power single receiver
Recommended antenna
antenna types need adapted with regards selected operating frequency. examples below antennas tuned incoming frequency 160.350MHz FIF: 160.325MHz 25kHz). antenna printed wire PCB, real estate permitting wire coil. case wire antenna, length should slightly above 40mm (Figure either printed straight loose wire used. magnetic coil antenna however recommended because unlike wire antenna, less sensitive de-tuning proximity body. coil made turns 0.4mm diameter copper wire. diameter antenna 14mm typical coil inductance 140nH (Figure coil soldered such elevated from least 10mm, this reduce losses ground plane effect board. value capacitors given here change slightly different PCBs.
14mm 40mm 22pF 120nH 2-10pF Figure Figure 2-10pF 10mm 3.9pF
XEMICS 2002 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. liability will accepted publisher consequence use. Publication thereof does convey imply license under patent other industrial intellectual property rights. XEMICS PRODUCTS DESIGNED, INTENDED, AUTHORIZED WARRANTED SUITABLE LIFE-SUPPORT APPLICATIONS, DEVICES SYSTEMS OTHER CRITICAL APPLICATIONS. INCLUSION XEMICS PRODUCTS SUCH APPLICATIONS UNDERSTOOD UNDERTAKEN SOLELY CUSTOMER'S RISK. Should customer purchase XEMICS products such unauthorized application, customer shall indemnify hold XEMICS officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs damages attorney fees which could arise.
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VCCR VCCA VCCO DEMOD Audio XE1218A power

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