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| TH71071 315/433MHz ASK Transmitter / LO Source Features ! Fully integrated, PLL-stabilized VCO ! Flexible frequency range from 310 MHz to 450 MHz ! ASK achieved by on/off keying of internal power amplifier ! FM possible with external varactor ! Wide power supply range from 2.2 V to 5.5 V ! High over-all frequency accuracy ! Very low standby current ! Adjustable output power range from -12 dBm to +2 dBm ! Adjustable current consumption from 4.8 mA to 11.5 mA ! Differential output well-suited for loop antenna ! Conforms to EN 300 220 and similar standard Ordering Information Part No. TH71071 Temperature Range -40 C to 85 C Package SOIC8 Application Examples ! ! ! ! ! ! Keyless car and central locking Low-power telemetry Alarm and security systems General digital data transmission General analog audio signal transmission Local oscillator signal generation Pin Description LF 1 RO 2 ENTX 3 PS/DATA 4 TH71071 8 VEE 7 OUT1 6 OUT2 5 VCC 3901071071 Rev. 004 Page 1 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source General Description The TH71071 ASK transmitter IC is designed for applications in the European 433MHz industrialscientific-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 310 MHz to 450 MHz (e.g. for applications in the US 315MHz ISM band). The transmitter's carrier frequency fc is determined by the frequency of the reference crystal fref that is used. The integrated PLL synthesizer ensures that each RF value, ranging from 310 MHz to 450 MHz, can be achieved by using a crystal with reference frequency according to: fref = fc/N, where N = 32 is the PLL feedback divider ratio. Theory of Operation General As depicted in Fig.1, the TH71071 transmitter consists of a fully integrated voltage-controlled oscillator (VCO), a divide-by-32 divider (div32), a phase-frequency detector (PFD) and a charge pump. An external loop filter at pin LF determines the dynamic behaviour of the PLL and suppresses reference spurious signals. The VCO's output signal feeds the power amplifier (PA). RF signal power Po can be adjusted in six steps from Po = -12 dBm to +2 dBm either by changing the value of resistor R1 or by varying the voltage VPS at pin PS/DATA. The open-collector differential output (OUT1, OUT2) can be used to either directly drive a loop antenna or to be converted to a single-ended impedance by means of a balanced-to-unbalanced (balun) transformer. For maximum available output power, the differential output should be matched to a load of approx. 1 k. Bandgap biasing ensures stable operation of the IC at a power supply range of 2.2 V to 5.5 V. ASK Modulation The TH71071 can be ASK-modulated by applying data directly at pin PS. This turns the PA on and off and therefore leads to an ASK signal at the output. LO Source Many applications require a stable RF source. For this purpose, the TH71071 can be used without modulation as an easy-to-use, PLL-stabilized, continuous wave (CW) generator. Frequency Modulation (FM) For FM operation an external varactor is required. It simply acts as a pulling capacitor connected in series to the crystal. Then the analog modulation signal, applied through a series resistor, directly modulates the XOSC. Mode Control Logic The mode control logic allows two different modes of operation as listed in the following table. The mode control pin ENTX is pulled-down internally. This guarantees that the whole circuit is shut down if this pin is left floating. ENTX Mode Description 0 1 TX disabled whole circuit in standby TX enable TX active Table 1: Modes of operation 3901071071 Rev. 004 Page 2 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source Block Diagram VCC OUT1 7 OUT2 6 PS/DATA 4 mode control PA ENTX 3 VCC 5 charge pump 8 VEE VCO div32 PFD LF 1 XOSC RO 2 Fig. 1: TH71071 block diagram with external components 3901071071 Rev. 004 Page 3 of 10 CX1 XTAL CF1 RF1 CF2 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source Pin Definition and Description Pin No. 1 LF Name I/O Type analog I/O LF 1 200 200 Functional Schematic Description connection to loop filter, charge pump output, VCO tuning input 5p 2 RO analog I/O 37k RO1 2 28p XOSC connection to XTAL, Colpitts type crystal oscillator 28p 3 ENTX input ENTX 3 1.1k mode control input, CMOScompatible with internal pull-down 4 PS/DATA analog I/O 20A power-select and ASK input, high-impedance comparator logic PS/DATA 4 200 5 6 VCC OUT2 supply output VCC VCC positive power supply differential power amplifier output, open collector OUT2 OUT1 7 7 OUT1 output 6 differential power amplifier output, open collector VEE VEE VEE 8 VEE ground negative power supply 3901071071 Rev. 004 Page 4 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source Technical Data Absolute Maximum Ratings Parameter Supply voltage Input voltage Input current Storage temperature Electrostatic discharge Symbol Vcc Vin Iin TSTG VESD human body model, MIL STD 833D method 3015.7 ENTX pin ENTX pin Condition Min -0.3 -0.3 -1.0 -40 -1.0 Max 7.0 VCC+0.3 1.0 150 +1.0 Unit V V mA C kV Normal Operating Conditions Parameter Supply voltage Operating temperature XOSC frequency VCO frequency Symbol Vcc Ta fref fc set by the crystal fc = 32 * fref Condition Min 2.2 -40 9.69 310 Max 5.5 85 14 450 Unit V C MHz MHz DC Characteristics all parameters under normal operating conditions, unless otherwise stated; typical values at Ta = 23 C and Vcc = 3 V Parameter Standby current Operating current Input HIGH voltage Input LOW voltage Input current Pull down current Symbol ISBY Icc VHIGH VLOW Iin Ipd Condition ENTX=0 ENTX=1, VPS=1.1V ENTX pin ENTX pin ENTX=0 ENTX=1 7 0.7*Vcc -0.3 -1 2 8 Min Typ 0.05 9 Max 0.1 10 Vcc+0.3 0.3*Vcc 1 15 Unit A mA V V A A 3901071071 Rev. 004 Page 5 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source AC Characteristics all parameters under normal operating conditions, unless otherwise stated; typical values at Ta = 23 C and Vcc = 3 V; ENTX = 1, VPS = 1.1V, fc = 433.6 MHz, test circuit shown in Fig. 2 Parameter Output power FM deviation Modulation frequency FM Data rate ASK Reference spurs Harmonic content Spurious output signal Phase noise VCO gain Charge pump current Start-up time Symbol Po fFM fmod RASK Pref Pharm Poff PN KVCO ICP ton from "all OFF" to any other mode NRZ @ fc fref @ 2fc , 3fc , 4fc VPS 0.1V @ fc 500kHz adjustable with varactor and VFM Condition Min Typ -1 6 5 40 -44 -40 -60 -87 200 260 0.9 Max Unit dBm kHz kHz kbit/s dBm dBm dBm dBc/Hz MHz/V A ms Output Power Selection typical values at Ta = 23 C and Vcc = 3 V: ENTX = 1, fc = 433.6 MHz, test circuit shown in Fig. 2 R1 / k R2 / k VPS / V Icc / mA Po / dBm Pharm / dBm 2 11.5 2 -40 0 7.5 4.7 1.1 8.6 -1 -40 11 4.7 0.9 7.3 -4 -40 15 4.7 0.7 6.2 -7 -45 24 4.7 0.5 5.3 -10 -45 43 4.7 0.3 4.8 -12 -50 If the transmitter is operated at any supply voltage Vcc, the values for R1 and R2 can be calculated as allows: V R1 = R2 * cc - 1 V PS Crystal Parameter Parameter Crystal frequency Load capacitance Static capacitance Resonance resistance Spurious response Symbol fcrystal Cload C0 Rm aspur Condition fundamental mode, AT Min 9.69 10 Max 14 15 7 60 -10 Unit MHz pF pF dB 3901071071 Rev. 004 Page 6 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source Test Circuit L2 L1 C1 Fig. 2: Test circuit for ASK with 50 matching network C4 L3 OUT C3 C2 C5 6 OUT2 ENTX 3 8 OUT1 7 1 2 CX RF1 CF2 CF1 XTAL R2 R1 C6 4 PS DATA 12 12 DATA GND RO LF 12 3 VCC VEE 5 Test circuit component list to Fig. 2 Part CF1 CF2 CX C1 C2 C3 C4 C5 C6 L1 L2 L3 RF1 R1 R2 XTAL Size 0603 0603 0603 0603 0805 0805 0603 0603 0805 0603 0603 0603 0603 0603 0603 HC49/S Value 10 nF 56 pF 68 pF 2.7 pF 100 pF 3.9 pF 330 pF 330 pF 33 nF 22 nH 27 nH 33 nH 1.5 k See output power selection table See output power selection table 13.55 MHz fundamental wave Tolerance 10% 10% 10% 5% 5% 5% 10% 10% 10% 5% 5% 5% 10% 10% 10% 30ppm calibration 30ppm temp. loop filter capacitor loop filter capacitor XOSC capacitor Description impedance matching capacitor impedance matching capacitor impedance matching capacitor blocking capacitor blocking capacitor blocking capacitor impedance matching inductor impedance matching inductor impedance matching inductor loop filter resistor ASK power-select resistor, not requirement at CW mode ASK or CW mode power-select resistor crystal, Cload = 12 pF to 15 pF, C0, max = 7 pF, Rm, max = 60 3901071071 Rev. 004 Page 7 of 10 VCC ENTX GND Data Sheet Dec. 2001 VCC GND TH71071 315/433MHz ASK Transmitter / LO Source Spectrum Plots All plots depict TH71071`s typical performance at Vcc = 3.0 V and Ta = 23 C, derived with the test circuit shown in Fig. 2. Fig. 3: RF output signal and spurious emissions, CW mode Fig. 4: Single-sideband phase noise at 500 kHz offset, CW mode Fig. 5: ASK modulation with RASK = 4 kbit/s NRZ 3901071071 Rev. 004 Page 8 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source Package Information E1 E 123 D A1 A e b L Fig. 6: SOIC8 (Small Outline Package) all Dimension in mm, coplanarity < 0.1mm D min max min max 4.80 4.98 0.189 0.196 E1 3.81 3.99 E 5.80 6.20 A 1.32 1.72 A1 0.10 0.25 e 1.27 b 0.36 0.46 L 0.41 1.27 0.016 0.050 0 8 0 8 all Dimension in inch, coplanarity < 0.004" 0.150 0.2284 0.060 0.0040 0.05 0.014 0.157 0.2440 0.068 0.0098 0.018 3901071071 Rev. 004 Page 9 of 10 Data Sheet Dec. 2001 TH71071 315/433MHz ASK Transmitter / LO Source Your Notes Important Notice Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis' rendering of technical or other services. (c) 2000 Melexis NV. All rights reserved. For the latest version of this document. Go to our website at www.melexis.com Or for additional information contact Melexis Direct: Europe and Japan: Phone: +32 1361 1631 E-mail: sales_europe@melexis.com All other locations: Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com QS9000, VDA6.1 and ISO14001 Certified 3901071071 Rev. 004 Page 10 of 10 Data Sheet Dec. 2001 |
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