PDF RF2514 Data sheet ( Hoja de datos )

Número de pieza	RF2514
Descripción	VHF/UHF TRANSMITTER
Fabricantes	RF Micro Devices
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No Preview Available ! Preliminary 11 RF2514 VHF/UHF TRANSMITTER Typical Applications • 868MHz/915MHz ISM Band Systems • Local Oscillator Source • Remote Keyless Entry • AM/ASK/OOK Transmitter • Wireless Security Systems Product Description The RF2514 is a monolithic integrated circuit intended for use as a low-cost AM/ASK transmitter. The device is pro- vided in a 4mmx4mm, 16-pin leadless chip carrier and is designed to provide a phased locked frequency source for use in local oscillator or transmitter applications. The chip can be used in applications in the North American and European VHF/UHF ISM bands. The integrated VCO, phase detector, reference divider, and reference oscillator transistor require only the addition of an exter- nal crystal to provide a complete phase-locked oscillator. In addition to the standard power-down mode, the chip also includes an automatic lock detect feature that dis- ables the transmitter output when the PLL is out-of-lock. 3.75 3.75 0.75 0.50 0.45 0.28 2 0.80 TYP 1 1 + 1.60 4.00 INDEX AREA 3 12° Dimensions in mm. 0.75 0.65 1.00 0.90 0.05 0.00 1.50 SQ 3.20 4.00 NOTES: 1 Shaded Pin is Lead 1. 2 Dimension applies to plated terminal and is measured between 0.10 mm and 0.25 mm from terminal tip. The terminal #1 identifier and terminal numbering convention 3 shall conform to JESD 95-1 SPP-012. Details of terminal #1 identifier are optional, but must be located within the zone indicated. The identifier may be either a mold or marked feature. 4 Pins 1 and 9 are fused. 5 Package Warpage: 0.05 max. Optimum Technology Matching® Applied Si BJT üSi Bi-CMOS GaAs HBT SiGe HBT GaAs MESFET Si CMOS 10 11 12 16 15 TX OUT 3 Lock Detect 5 13 Phase Detector & Charge Pump Prescaler 32/64 14 DC Bias 2 PD Package Style: LCC, 16-Pin, 4x4 Features • Fully Integrated PLL Circuit • Integrated VCO and Reference Oscillator • 2.2V to 3.6V Supply Voltage • Low Current and Power Down Capability • 100MHz to 1000MHz Frequency Range • Out-of-Lock Inhibit Circuit Ordering Information RF2514 VHF/UHF Transmitter RF2514 PCBA Fully Assembled Evaluation Board 11 Functional Block Diagram RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev A2 010215 11-27 1 page Preliminary RF2514 RF2514 Theory of Operation Introduction Short range radio devices are becoming commonplace in today's environment. The most common examples are the remote keyless entry systems popular on many new cars and trucks and the ubiquitous garage door opener. Other applications are emerging along with the growth in home security and automation and the advent of various remote control applications. Typically these devices have been simplex, or one way, links. They are also typically built using surface acoustic wave (SAW) devices as the frequency control ele- ments. This approach has been attractive because the SAW devices have been readily available and a trans- mitter, for example, could be built with only a few addi- tional components. Recently, however, RF Micro Devices has introduced several new components that enable a new class of short range radio devices based on the use of crystals and phase locked loops for fre- quency control. These devices are superior in perfor- mance and comparable in cost to the traditional SAW based designs. The RF2514 is an example of such a device. The RF2514 is targeted for applications such as 315, 433, 868 and 915MHz band remote keyless entry systems, wireless security systems, and other remote control applications. The RF2514 Transmitter The RF2514 is a low cost AM/ASK VHF/UHF transmit- ter designed for applications operating within the fre- quency range of 100MHz to 1000MHz. In particular, it is intended for 868 and 915MHz band systems (ETS 300 220 applications and FCC Parts 15.231 and 15.249 transmitters) and remote keyless entry sys- tems. It can also be used as a local oscillator signal source. The integrated VCO, phase detector, pres- caler, and reference oscillator require only the addition of an external crystal to provide a complete phase- locked loop. In addition to the standard power down mode, the chip also includes an automatic lock detect feature that disables the transmitter output when the PLL is out-of-lock. The device is manufactured on a 25GHz silicon bipo- lar-CMOS process and packaged in an industry stan- dard MLF16 plastic package. This, combined with the low external parts count, enables the designer to achieve small-footprint, high-performance, low-cost designs. The RF2514 is designed to operate from a supply volt- age ranging from 2.2V to 3.6V, accommodating designs using three NiCd battery cells, two AAA flash- Rev A2 010215 light cells, or a lithium button battery. The device is capable of providing up to +5dBm output power into a 50Ω load and is intended to comply with FCC and ETSI requirements for unlicensed remote control trans- mitters. ESD protection is provided on all pins except for OSCB, OSCE, RESNTR-, RESNTR+, TXOUT, and the two analog ground pins (1 and 9). While this device is intended for OOK operation, it is possible to use narrowband FM. This is accomplished by modulating the reference oscillator rather than applying the data to the MOD IN input pin. The MOD IN pin should be tied high to cause the device to trans- mit. The deviation will be set by pulling limits of the crystal. Deviation sufficient for the transmission of voice and other low data rate signals can therefore be accomplished. Refer to the Application Schematic in the data sheet for details. RF2514 Functional Blocks A PLL consists of a reference oscillator, a phase detec- tor, a loop filter, a voltage controlled oscillator (VCO), and a programmable divider in the feedback path. The RF2514 includes all of these internally except for the loop filter and the reference oscillator's crystal and two feedback capacitors. The reference oscillator is a Colpitts type oscillator. Pins OSC B and OSC E provide connections to a tran- sistor that is used as the reference oscillator. The Col- pitts configuration is a low parts count topology with reliable performance and reasonable phase noise. Alternatively, an external signal could be injected into the base of the transistor. The drive level should, in either case, be around 500mVPP. This level prevents overdriving the device and keeps the phase noise and reference spurs to a minimum. The prescaler uses a series of flip-flops to divide the VCO frequency by either 64 or 32, depending upon the logic level present at the DIV CTRL pin. A high logic level will select the 64 divisor. A low logic level will select the 32 divisor. This divided signal is then fed into the phase detector where it is compared with the refer- ence frequency. The RF2514 contains an onboard phase detector and charge pump. The phase detector compares the phase of the reference oscillator to the phase of the prescaler output. The phase detector is implemented using flip- flops in a topology referred to as either "digital phase/ frequency detector" or "digital tri-state comparator". 11 11-31 5 Page Preliminary RF2514 Evaluation Board Schematic 868 MHz P1 1 GND, DGND P1-2 2 PD P1-3 3 VCC CON3 C1 3 - 10 pF X1 13.577 MHz C2 33 pF C3 68 pF C4 1 nF R1 0Ω R2 0Ω VCC PD J1 TX OUT VCC C17* 50 Ω µstrip C16 4 pF L3 10 nH C15 5 pF C14 L2 1.5 pF 18 nH C13* C12 0.1 uF 1 16 15 14 13 C5 7 pF R3 22 kΩ C6 100 pF 2 12 L1 is placed 130 mils from the edge of U1 so an 18 nH standard inductor can be used. VCC 3 11 L1 18 nH R5 1.5 kΩ C7 0.1 uF C8* 4 10 FLAG 56789 J2 MOD IN 50 Ω µstrip *Components not populated on PCB. R7 3.9 kΩ C11 10 nF R8 6.2 kΩ C10 10 nF R6 10 Ω C9 10 nF 2514400- VCC 11 Rev A2 010215 11-37 11 Page

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