RX2020 916.5 MHz ASH Receiver • • • • • Ideal for 916.5 MHz, 3 V Data Receivers in Europe High-Sensitivity Passive Design with No RF Oscillation Use with HX2000 for 19.2 kbps Data Rate Simple to Apply with External Parts Count Rugged, Surface-Mount Package with 130 mm2 Footprint SM-10 Case This amplifier-sequenced hybrid (ASH) receiver is based on several leading-edge technologies that allow outstanding performance in a small and simple-to-apply module. Two surface-accoustic-wave (SAW) devices are employed. Front-end filtering by a low-loss coupled-resonator SAW filter provides excellent selectivity. Typical sensitivity better than -72 dBm is achieved with no RF oscillating or regenerative circuits. This results in virtually no RF spurious emissions. A low-loss SAW delay line provides the time delay necessary to sequence the two RF amplifiers. Time sequencing of the RF gain eliminates the need for frequency conversion prior to AM detection. This receiver is designed to operate from a 3 V lithium battery with typically 2.5 mA current. For system design flexibility, the baseband output is accessible, and the comparator threshold can be changed externally between two settings. Typical applications include unlicensed wireless remote-controls, and digital data links operating in the USA under FCC Part 15.249 and in Canada under DOC RSS-210. Electrical Characteristics Characteristic Operating Radio Frequency Sym fC Received Carrier Modulation Type RF Band Sensitivity Operating Signal Strength Channel Width Input Impedance Interference Rejection Half-Frequency Spurious fC ± 1 MHz Sequencing (Sampling) Sample Duration Sample Repetition Rate Data Rate 3 dB Bandwidth Default (Terminal 5 NC) Override (Terminal 5 LOW) CMOS Load Capacitance Baseband Comparator Threshold Digital Output Power Supply Notes Minimum 2, 3 4, 5 6 Typical Maximum 916.50 Nominal MHz Pulse Modulation (OOK) -72 -10 fC±200 ZIN 7 9 10 W dB ns kHz kb/s kHz mV Output HIGH Voltage VOH VCC -0.2 VCC Output LOW Voltage VOL 0.0 0.2 Rise Time tR 3 Fall Time tF 3 Operating Voltage VCC Current at 25C and 3.0 V ICC Operating Ambient Temperature TA Lid Symbolization (in addition to Lot and/or Date Codes) RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. 1 1 2.7 kHz 80 15 10 11 dBm 50 Nominal 700 625 20 24 25 0 8 Units pF V µs 3.0 3.5 VDC 2.5 3.0 mA +85 °C -40 RFM RX2020 E-mail: [email protected] http://www.rfm.com RX2020-121198 Page 1 of 4 The RX Series SMT Hybrid ASH Receivers CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. Unless noted otherwise, specifications apply over the entire specified operating temperature and voltage ranges. 2. One or more of the following United States patents apply: 4,454,488; 4,616,197; 4,749,964; 4,902,925. Other patents are pending. 3. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufacturer. 4. The design, manufacturing process, and specifications of this device are subject to change without notice. 5. A variety of on-off-keyed (OOK) pulse modulation schemes are possible since digital decoding is an external function (not included in the ASH receiver). 6. These parameters apply over the absolute minimum operating passband which is referenced to fC. 7. With interfering signal matched to the receiver modulation and code. See “Typical Modulated Interference Rejection” for a more detailed view. 8. Sample repetition rates greater than 1 MHz are available in custom versions. Contact RFM for details. 9. Baseband data rates are available to 20 kbps, respectively, in custom versions. Contact RFM for details. See HX/RX Designer’s Guide for details on data rate limits. 10. The default comparator threshold (with terminal 5 not connected) is optimized for low duty-cycle, or “bursty” data and eliminates noise output when there is no RF signal. The override threshold (with terminal 5 connected to ground) is optimized for continuous data. 11. The ASH receiver is designed to drive a single CMOS load. 12. For ESD protection. Absolute Maximum Ratings Rating Incident RF Power Power Supply Voltage (VCC to Ground)(Observe ESD Precautions) ESD (100 pF, 1.5 kW) Value Units +10 dBm -0.3 to +4.0 VDC Terminals 2, 3, or 7 to Ground ±2000 All Other Terminals to Ground ±300 -40 to +100 Case Temperature1 V °C Block Diagram and Electrical Connections 50 ohm Antenna Note 12 10 9 8 7 RF Input Gnd Gnd Data Output 6 Voltage Reference 1 uF Top View Pulse Generator RF Amp. SAW Delay Line RF Amp. AM Detector LPF SAW BPF Comparator Baseband Output 2 Vcc 1 +3V Comparator Input 3 Gnd 4 Threshold Override 5 10 uF 0.1 to 10 uF RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RX2020-121198 Page 2 of 4 The RX Series SMT Hybrid ASH Receivers Demonstration Circuit + 1 Vcc Note 12 RF In 10 +3V Lithium CR2032 1 16 2 15 10 uF 2 BB Out Gnd 9 3 3 Comp In Gnd 8 4 Data Out 7 5 + .1 to 1uF 4 Gnd 5 Thres Override OPEN: Default 25mV CLOSED: Override OV Vref 6 6 + 1 uF 33 K + 7 MC145028 Decoder Top View 14 13 1 mA @ 3VDC RS 273-065A or equiv 12 + Piezo 11 Alarm 10 0.1 uF 0.1 uF + 620 K 8 9 Typical Modulated Interference Rejection (433.92 MHz RX1000 Shown) This plot is for an interfacing signal modulated with the receiver’s modulation and code. Continuous wave (CW) or signals with other modulation or codes typically result in significantly better rejection performance. Spurious Rejection Relative to Passband Sensitivity (dB) 0 0 10 10 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 100 100 110 110 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 216.96 Half Freq. Spurious Response 433.92 Operating Freq. RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. Frequency (MHz) E-mail: [email protected] http://www.rfm.com RX2020-121198 Page 3 of 4 The RX Series SMT Hybrid ASH Receivers Case Design 0.370 (9.40) 0.065 (1.65) 10 Places 0.050 (1.27) 10 Places 0.070 (1.78) 4 Places RFM Rxxxxx 0.540 (13.72) 0.241 (6.12) 0.10 (2.54) 0.100 (2.54) 4 Places Typical Antennas A B C D Ground Plane 50 Ω Enameled Wire, AWG = G Inner Dia = E No. Turns = F Frequency Dimensions A B C D E F G Units Inches Millimeters Inches Millimeters Inches Millimeters Inches Millimeters Inches Millimeters Number of Turns AWG 303.825 418.0 433.92 916.5 5.35 135.89 1.0 25.4 0.25 6.35 3.7 93.98 0.375 9.53 4T #20 3.9 99.06 0.6 15.24 0.6 15.24 2.7 68.58 0.1 2.54 16T #22 3.55 90.17 0.6 15.24 0.55 13.97 2.4 60.96 0.1 2.54 15T #22 1.58 40.13 0.4 10.16 0.18 4.57 1.0 25.4 0.1 2.54 7T #24 RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RX2020-121198 Page 4 of 4