Features • Very High Transmitting Frequency Accuracy Compared to SAW Solutions (Enables Receivers at Lower Bandwidth than With SAW Resonators) • Lower Cost than the Usual Discrete Solutions Using SAW and Transistors • Supply Voltage 2.2V to 4.0V in the Temperature Range of –40°C to 85°C • XTO Output for Clocking the Microcontroller, Thereby, Together with the ATAR090 or ATAR890, Resulting in the Optimum System Cost-effectiveness • One-chip Solution With Minimum External Circuitry • Single-ended Open-collector Output (Same Antennas Can Be Used as in Discrete Solutions, Simpler Matching of Magnetic Loop Antennas) • ESD Protection According to MIL-STD 883 (4 KV HBM) Except Pins XTO1, XTO2, ANT and LF • Very Small SSO16 Package, Pitch 0.635, 150 mil 1. Description UHF ASK Transmitter ATA2745 The ATA2745 is a PLL transmitter IC which has been developed especially for the demands of RF low-cost data transmission systems at data rates up to 20 kBaud. The transmitting frequency range is 310 MHz to 440 MHz. It can be used in ASK systems. The main applications of the ATA2745 are in the areas of outside temperature metering, socket control, garage door openers, consumption metering, light/fan or airconditioning controls, jalousies, wireless keyboards, and various other consumer market applications. 4898B–RKE–08/06 Figure 1-1. System Block Diagram UHF ASK/FSK Remote control transmitter UHF ASK/FSK Remote control receiver 1 Li cell ATA2745 ATA3745 1 to 3 Demod Keys Encoder ATARx9x Microcontroller PLL Antenna XTO IF Amp Antenna VCO PLL Power amp. Figure 1-2. Control LNA XTO VCO Block Diagram ASK GND OR PWRSET EN Power up VCC PWRVCC VCO PA CLK ANT f GND PWRGND1 64 LFVCC PWRGND2 f LF 2 XTO n LFGND ATA2745 XTO1 NC ATA2745 4898B–RKE–08/06 ATA2745 2. Pin Configuration Figure 2-1. Pinning SSO16 ASK 1 16 GND EN 2 15 PWRSET VCC 3 14 PWRVCC CLK 4 13 ANT GND 5 12 PWRGND1 LFVCC 6 11 PWRGND2 LFGND 7 10 XTO1 LF 8 9 NC ATA2745 Table 2-1. Pin Description Pin Symbol Function 1 ASK Modulation input ASK 2 EN Enable input 3 VCC Supply voltage 4 CLK Clock output 5 GND Ground 6 LFVCC Supply voltage VCO 7 LFGND VCO ground 8 LF Circuit PLL loop 9 NC Not connected 10 XTO1 11 PWRGND2 Connection for crystal Power GND2 12 PWRGND1 Power GND1 13 ANT 14 PWRVCC Supply voltage power amplifier 15 PWRSET Applied to VCC 16 GND RF output Ground 3 4898B–RKE–08/06 3. General Description The fully integrated VCO and the single-ended open-collector output allow particularly simple, low-cost RF miniature transmitters to be assembled. The single-ended output enables a considerably simplified adaptation of both a magnetic loop antenna of any form or a / 4 antenna. This is because the load impedance must not be balanced as would be the case with a differential output. The XTO's frequency can be selected to be either 13.56 MHz or 9.844 MHz (USA). At these frequencies, crystals have a very fast start-up time (< 1.5 ms), whereby a wait time of 5 ms to 10 ms is required until the transmitter IC is locked. This means that the processor does not need to poll a lock detect output. 4. Functional Description 4.1 ASK Transmission The ATA2745 is activated by EN = VS. VASK must remain 0V for 5 ms, then the output power can be modulated by means of pin ASK. VEN remains equal to VS during the transmission of the message. The ASK input activates the power amplifier and the PLL. 4.2 Take-over of the Clock Pulse in the Microcontroller The clock of the crystal oscillator can be used for clocking the microcontroller. The ATAR090 and ATAR890 have the special feature of starting with an integrated RC oscillator to switch on the ATA2745 with VEN = VS. 5 ms later, the 3.39-MHz clock frequency is present, so that the message can be sent with crystal accuracy. 5. Application Circuit The following component values are recommendations for a typical application. C4, C5, and C6 are block capacitors. The values of these capacitors depend on the board layout. C4 = 1 nF, C5 = 1 nF, and C6 = 22 nF are typically used here. For C5, the impedance between f = 100 MHz and f = 1 GHz should be as low as possible. CLoop1 and CLoop2 are selected so that the antenna oscillates in resonance and the matching to the appropriate impedance transformation is possible. LFeed is an inductor for the antenna's DC current supply. A typical value is LFeed = 220 nH. LFeed can be either printed on the PC board or be a discrete component. 4 ATA2745 4898B–RKE–08/06 ATA2745 5.1 Output Power Measurement The following output network (Figure 5-1 on page 5) can be used for output power evaluation, the exact values of L10 and C10 are dependent on the layout. L10 and C10 form the transformation network to adopt the output impedance of the IC to 50. The following table shows the values for an output power of 2 mW and an RPWRSET = 1.2 k. Table 5-1. Transformation Network f [MHz] C10 [pF] L10 [nH] ZLoad-opt [] 315 2.7 56 260 + j330 433.92 1.8 33 185 + j268 Figure 5-1. Measurement Output Network VS PWRVCC L10 ZLoad-opt ANT C10 50Ω Figure 5-2. Application Circuit +VS = 2.2 to 4.0V GND ASK ASK 1 16 OR 2 VCC CLoop2 PWRSET EN EN 15 RPWRSET Power up PWRVCC 3 14 C6 C4 CLK CLK VCO PA 4 LFeed ANT 13 3.39MHz f 5 12 64 LFVCC PWRGND2 6 11 C5 f XTO LFGND n 7 R4 C1 XTO1 13.56MHz 10 C3 NC LF 8 C2 CLoop1 PWRGND1 GND ATA2745 9 Antenna 5 4898B–RKE–08/06 6. Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Max. Unit Supply voltage Symbol VS 6 V Power dissipation Ptot 250 mW Tj 150 C Junction temperature Min. Storage temperature Tstg –55 125 C Ambient temperature Tamb –40 85 C Electrostatic sensitive device. Observe precautions for handling. 7. Thermal Resistance Parameters Junction ambient Symbol Value Unit RthJA 180 K/W 8. Electrical Characteristics All parameters are refered to GND (pin 5), VS = 3V, Tamb = 25°C, unless otherwise specified The possible operating ranges refer to different circuit conditions: VS = 2.2V to 4.0V at Tamb = –40°C to +85°C Parameters Test Conditions Supply current (power down) VASK, VFSK 0.3V, VS < 3.6V Supply current (power up, output OFF) VASK = GND, VEN = VS, VS = 3V Supply current (power up, output ON) VASK = VS, VS = 3V, RPWRSET = 1.2 k Output power Output power variation for f = 315 MHz compared to f = 433.92 MHz VS = 3V, Tamb = 25C, f = 433.92 MHz RPWRSET = 1.2 k f = 315 MHz Pout = PRef + PRef Symbol Typ. Max. Unit ISoff 2 10 µA ISon 4.7 6.2 mA IStransmit 10 12.5 mA 3 5 dBm PRef 1 PRef 1.5 dB Voutmax VS – 0.7V V(peak) Maximum peak output antenna voltage At Pout = 2.0 mW, the load impedance must be selected to meet the Vout maximum requirement, the supply current is not dependent on the load impedance tolerance Spurious emission fo ±(n fPC) where fPC = 6.78 MHz Load capacitance at CLK 3 pF f = 230 MHz to 470 MHz f < 230 MHz, f > 470 MHz Em Em Oscillator frequency XTO Crystal frequency = 13.56 MHz fXTO 6 Min. 13.56 – 30 ppm 13.56 –40 –58 dBC dBC 13.56 + 30 ppm MHz ATA2745 4898B–RKE–08/06 ATA2745 8. Electrical Characteristics (Continued) All parameters are refered to GND (pin 5), VS = 3V, Tamb = 25°C, unless otherwise specified The possible operating ranges refer to different circuit conditions: VS = 2.2V to 4.0V at Tamb = –40°C to +85°C Parameters Test Conditions Loop bandwidth For best LO noise Loop filter components: C2 = 3.9 nF, C1 = 15 nF, R4 = 220 BLoop 100 Phase noise PLL Referring to the phase comparator fPC = 6.78 MHz PNPLL –111 Phase noise VCO At 1 MHz At 36 MHz PNVCO PNVCO –90 –122 Frequency range of the VCO Symbol fVCO Min. Typ. 310 Max. Unit kHz –105 dBC/Hz dBC/Hz 440 MHz Clock output (CMOS microcontroller compatible) Clkout Load capacitance at CLK CCLK 10 pF Rs Rs 80 100 20 kHz 100 µA µA µA µA Series resonance R of the crystal fXTO = 13.56 MHz fXTO = 9.84 MHz ASK modulation frequency rate Duty cycle of the modulation signal = 50% fout / 128 fmodASK 0 Iol Iol Ioh Ioh 150 200 –150 –200 ASK input - Low level input voltage - High level input voltage - Input current High VASKl VASKh IASKh 1.7 Enable ASK - Low level input voltage - High level input voltage - Input current High VEN VFSKl VFSKh IFSKh CLK output - Output current Low - Output current Low - Output current High - Output current High VCLK = 0.2 VS VCLK = 0.3 VS VCLK = 0.8 VS VCLK = 0.7 VS MHz 0.3 140 0.3 1.7 140 V V µA V V µA 7 4898B–RKE–08/06 9. Ordering Information Extended Type Number Package ATA2745M-TCQY SSO16 Remarks Taped and reeled, Pb-free 10. Package Information 5 max. 0.6 1.4 1.7 max. 4.9±0.1 0.1+0.15 0.2 0.25 3.95 max. 0.635 nom. 5±0.2 7 x 0.635 = 4.445 nom. 6±0.2 16 9 technical drawings according to DIN specifications 1 8 Dimensions in mm Package acc. JEDEC MO 137 AB 02/05/99 TITLE Package Drawing Contact: [email protected] 8 Package: SSO16 GPC DRAWING NO. REV. 6.543-5060.01-4 2 ATA2745 4898B–RKE–08/06 ATA2745 11. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 4898B-RKE-08/06 Put datasheet in a new template Section 9 “Ordering Information” on page 8 changed 9 4898B–RKE–08/06 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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