PDF TA0028 Data sheet ( Hoja de datos )

Número de pieza	TA0028
Descripción	Silicon Transceiver
Fabricantes	RF Micro Devices
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No Preview Available ! TA0028 TA0028 RF2905/2915/2925: Silicon Transceiver Family for Low-Power Wireless Communications A family of low-power RF transceivers has been devel- oped for wireless data communications devices oper- ating in the European 433MHz to 869MHz ISM bands or the U.S. 902MHz to 928MHz ISM band. All three IC's have been implemented in a 15GHz silicon bipolar process technology that allows low-power FSK/ASK transceiver operation in commercial wireless products. Typical applications include wireless security systems, wireless meter reading equipment, or virtually any wireless data link application operating up to 1Mb/s. All three devices include an inherent transmit/receive switch, a complete receiver/demodulator, a low-power voltage-controlled oscillator (VCO), and a complete modulator/transmitter. Additionally, the RF2905/2925 include an on-chip PLL frequency synthesizer that can be used to support up to 4-channel operation. For applications requiring more channels, the RF2915 is designed to interface directly to commercially available programmable PLL frequency synthesizers. The RF2905 provides for two-channel transceiver opera- tion, while the RF2925 is optimized for single channel operation in systems using Time Division Duplexing (TDD). The typical DC power consumption of these devices is less than [email protected] in the sleep mode, [email protected] in the receive mode, and [email protected] in the transmit mode. At 3.0V operation, the receiver achieves a typical cascaded noise figure of 10dB and the transmitter produces +4dBm (@ 915MHz) typically into a 50Ω load. The chip also provides for modulation flexibility and can be configured as an FSK/FM, or ASK/AM data transceiver. The RF2905/2925 are pack- aged in a low-cost 48-pin LQFP package. The RF2915 is packaged in a 32-pin LQFP package. This paper also discusses operation of the device as an unlicensed FSK transceiver in the U.S. 902MHz to 928MHz ISM band with regulatory compliance to FCC Part 15.249. In addition, a variety of application consid- erations are provided to assist system designers in implementing the device as a one-way transmitter/ receiver, or as a full two-way RF transceiver using FSK or OOK AM data modulation. Until recently, low-cost wireless data or voice products for a wide range of consumer and industrial applica- tions have predominately utilized lower VHF frequency bands for unlicensed operation of low-power RF devices. Operation in these frequency bands, such as the U.S. 49.82MHz to 49.90MHz band, has been an obvious choice for designers in these cost sensitive applications due to the abundant supply of low-cost highly integrated components. The success and wide market acceptance of wireless products, such as 49MHz analog cordless telephones, have resulted in the demand for next generation wireless products that achieve higher performance levels at lower cost. Fur- thermore, the crowded conditions that exist in the tradi- tional VHF frequency bands and the need for additional bandwidth to support advanced products using digital modulation techniques have motivated product design- ers to develop products that operate in spectrum allo- cated at UHF, such as the U.S. 902MHz to 928MHz ISM band. To reduce product development cycles in these next generation products three new monolithic RF transceiver products (RF2905/2915/2925) have been introduced by RF Micro Devices that provide product designers with "Antenna-to-Bits and Back" solutions for their wireless applications. Target wireless applications for the RF2905 transceiver family include utility meter reading, security systems, bar code scan- ners, cordless telephones, and RFID tags just to name a few. All three transceiver products were designed to achieve high performance levels while minimizing DC power consumption. Integral to the design process was the use of Optimum Technology MatchingTM to select the appropriate IC technology to meet the prod- uct objective. Optimum Technology MatchingTM means that we consider all RFIC technologies at our disposal for new designs to develop the lowest cost solution that meets the technical requirements of a given applica- tion. In the case of the RF2905 transceiver family, the primary applications for these devices are in battery powered applications, such as those found in wireless utility meter reading applications where the primary battery may be expected to last for 10 years or more. In the case of the RF2905 transceiver family, a 15GHz sil- icon bipolar process technology was deemed as an Optimum Technology Match for this application. The silicon bipolar process we selected provides a mini- mum geometry device that exhibits a 15GHz FT under 3V and 0.5mA DC operation. Of the GaAs and silicon IC processes we considered, this process allows us to provide a monolithic, low-power, UHF transceiver IC that sells for less than $4.00 in volume. Copyright 1997-2000 RF Micro Devices, Inc. 13-131 13 1 page TA0028 !" #$%$&' (& ) * +(#, The RF2905/2915/2925 are available on evaluation PCB's that provide users with a convenient way to try out the transceiver in their wireless application. As an example, the RF2905 evaluation PCB can be used out- of-the-box to provide a 28.8Kb/s two-way data link in the U.S. 902MHz to 928MHz ISM band. Application considerations related to range of the transceiver, PLL bandwidth, and regulatory compliance required for device operating under FCC Part 15.249 are discussed in the paragraphs that follow. Similar issues apply to operation of the devices in the European ISM bands. A detailed schematic of the application circuit discussed is provided in Figure 2. VCC 4.7 uF VCC 10 Ω 10 nF VCC 10 Ω 10 nF 10 Ω 10 22 nF pF TX DATA LVL ADJ PLL ENABL 10 nF 22 pF 4 kΩ 4.7 4.7 nH D1 nH 5 pF 1uF 470 0.1uF 0.1 uF RX ENABL 1 TX ENABL 2 Filter 100 pF 3 48 47 46 34 Gain Control 31 30 5 100 pF 10 nH 22 pF 7 10 pF 9 8.2 uH 22 pF 11 12 41 43 42 Lock Detector Phase Detector & Charge Pump Prescaler 128/129 or 64/65 Linear RSSI 100 pF 100 100 pF pF 40 39 38 Ref Select LOCK DET+ 10 Ω VCC 22 pF 10 nF 44 32 10 Ω VCC 22 10 nF pF 37 OSC SEL 45 PRESCL OUT 36 MOD CTRL 35 DIV CTRL 24 25 FM OUT 26 DATA OUT 11 pF 13 14 15 16 Filter 10 nF 10 nF 10 nF 17 18 20 21 22 28 27 29 23 Filter 5 pF 10 nF 10 nF 10 nF FM Disc. 51 kΩ RSSI 10 pF MUTE VCC D1 : SMV1233-011 PLL LOOP BANDWIDTH ~1 kHz 22 pF 10 nF 10 Ω 13 Figure 2. Application Circuit for 915MHz 9.6KB/s FSK Transceiver ) - The RF2905 has four basic operating modes: sleep; lock; receive; and, transmit. The sleep mode allows the transceivers to be turned completely off to reduce the device current consumption to much less than 1µA. When the IC is in the lock mode, the VCO, prescaler, and LO buffer circuitry is enabled to allow the PLL to achieve lock prior to enabling the receiver or transmit- ter functions. This avoids the possibility of an inadvert- ent spurious emission during the interval when the PLL is locking. In operation, the receiver and transmitter functions are enabled once the PLL has achieved lock. Copyright 1997-2000 RF Micro Devices, Inc. 13-135 5 Page TA0028 13 Figures 9a & 9b. Observed Transmitter Output Waveforms . has also been demonstrated in a large commercial A family of transceiver IC's have been developed that office building. The IC's are manufactured on 8-inch sil- offer robust transceiver performance in wireless radio icon wafer ICs, and are currently available in volume for applications in the European and U.S. ISM bands. The under $4.00. IC's can be configured for FM/FSK or AM/ASK data modulation. Product differentiation with regard to the number of RF channels and the Rx/Tx turn-around time are provided in the RF2905 family to support a wide range of battery-powered applications. The viabil- ity of using the device as a wireless data transceiver Copyright 1997-2000 RF Micro Devices, Inc. 13-141 11 Page

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