TRF4903PWRG4

     
  
 

 SWRS023B − MAY 2004 − REVISED MARCH 2005 D Single-Chip RF Transmitter for 315-MHz, D D D D D D D Programmable Brownout Detector D Integrated Data Bit Synchronizer and Baud 433-MHz, 868-MHz, and 915-MHz Industrial, Scientific, and Medical (ISM) Bands 2.2-V to 3.6-V Operation Low Power Consumption FSK/OOK Operation Integer-N Synthesizer With Fully Integrated Voltage Controlled Oscillator (VCO) On-Chip Reference Oscillator and Phase-Locked Loop (PLL) Power Amplifier With 8-dBm Typical Output Power Rate Selection D Flexible 3-Wire Serial Interface D Minimal Number of External Components D D D D Required 24-Pin Plastic Thin-Shrink Small Outline Package (TSSOP) Programmable XTAL Trimming Lock Detect Indicator Companion Transmitter to the TRF6903 Transceiver PW PACKAGE (TOP VIEW) TX_DATA MODE STDBY PA_OUT PA_GND1 PA_VCC PA_GND2 VCO_PRE_VCC VCO_GND VCO_CORE_VCC VCO_BYPASS VCO_TUNE 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 CLOCK DATA STROBE GND XTAL_SW XTAL DGND DVDD DET_LD_DCLK CP_GND CP_OUT CP_VCC These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the gates. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright  2005, Texas Instruments Incorporated 
 
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 SWRS023B − MAY 2004 − REVISED MARCH 2005 description The TRF4903 single-chip solution is an integrated circuit intended for use as a low-cost multiband FSK or OOK transmitter to establish a frequency-programmable, half-duplex RF link. The multichannel transmitter is intended for digital (FSK, OOK) modulated applications in the North American and European 315-MHz, 433-MHz, 868-MHz, and 915-MHz ISM bands. The single-chip operates down to 2.2 V and is designed for low power consumption. The synthesizer has a typical channel spacing of better than 200 kHz and features a fully-integrated VCO. Only the PLL loop filter is external to the device. Two fully-programmable operation modes, Mode0 and Mode1, allow extremely fast switching between two preprogrammed settings (for example, TX_frequency_0/TX_frequency_1; …) without reprogramming the device. ISM band standards Europe has assigned an unlicensed frequency band of 868 MHz to 870 MHz. This band is specifically defined for short range devices with duty cycles from 0.1% to 100% in several subbands. The new European frequency band, due to the duty cycle assignment, allows a reliable RF link and makes many new applications possible. The North American unlicensed ISM band covers 902 MHz to 928 MHz (center frequency of 915 MHz) and is suitable for short range RF links. transmitter The transmitter consists of an integrated VCO and tank circuit, a complete integer-N synthesizer, and a power amplifier. The dividers, prescaler, and reference oscillator require only the addition of an external crystal and a loop filter to provide a complete PLL with a typical frequency resolution of better than 200 kHz. Since the typical RF output power is approximately 8 dBm, no additional external RF power amplifier is necessary in most applications. Four attenuation setting for the power amplifier are offered. This feature allows the user to fine tune the amplifier for optimal output power. baseband interface The TRF4903 can easily be interfaced to a baseband processor such as the Texas Instruments MSP430 ultralow-power microcontroller (see Figure 1). The TRF4903 serial control registers are programmed by the MSP430 and the MSP430 performs baseband operations in the software. A synchronized data clock, programmable for most common data rates, is provided by the TRF4903. During transmit, the data clock can be used to clock the transmit data from the microcontroller to the TRF4903 at predefined data rates. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 
     
  
 

 SWRS023B − MAY 2004 − REVISED MARCH 2005 Antenna Microcontroller Section RF Section Transmit Data TX_DATA Brownout Detector, Lock Detect, Data Clock DET_LD_DCLK PA_OUT RF Out TRF4903 Transmitter + Discretes Mode Select Standby MODE STDBY MSP430 Family µC Serial Control Data DATA Serial Control Clock CLOCK Serial Control Strobe STROBE Figure 1. System Block Diagram for Interfacing to the MSP430 Microcontroller functional block diagram 16 DET_LD_DCLK Bit Synchronizer and Data Clock MUX Band-gap 8 /ACounter Brownout Detector 24 23 /Div. CTRL 6 /N Prescaler Serial Interface 22 3 2 /BCounter 32/33 CLOCK DATA STROBE STDBY MODE Lock Detect PA Output Divider 1, 2, 3 PFD CPs VCO VCO_TUNE 12 14 CP_OUT /Ref 2...255 1 XTAL Switch 19 XTAL_SW 4 XTAL PA_OUT TX_DATA 20 Loop Filter POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 
     
  
 

 SWRS023B − MAY 2004 − REVISED MARCH 2005 Terminal Functions TERMINAL NAME NO. I/O I DESCRIPTION CLOCK 24 Serial interface clock signal input CP_GND 15 CP_OUT 14 CP_VCC 13 DATA 23 I Serial interface data signal input DET_LD_DCLK 16 O Brownout detector (active high), PLL lock detect (active high), and data clock multiplexed output DGND 18 Digital and XTAL oscillator ground DVDD 17 Digital and XTAL oscillator power supply GND 21 MODE 2 PA_GND1 5 Power amplifier ground PA_GND2 7 Power amplifier ground PA_OUT 4 PA_VCC 6 STDBY 3 I Standby input signal; active low STROBE 22 I Serial interface strobe signal TX_DATA 1 I Buffered TX data input VCO_BYPASS 11 I VCO_GND 9 VCO_TUNE 12 VCO_CORE_VCC 10 VCO core supply voltage VCO_PRE_VCC 8 Divider and prescaler supply voltage XTAL 19 I/O XTAL_SW 20 I Charge pump ground O Charge pump output Charge pump supply voltage Substrate ground I O Mode select input Power amplifier output Power amplifier supply voltage VCO bypass; connect to ground through a 100-pF capacitor VCO ground I Tuning voltage for the integrated VCO Connection to an external crystal reference Connection to external capacitor, which sets the frequency deviation of the transmitted signal absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Supply voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.6 to 4.5 Vdc Input voltage, logic signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.6 to 4.5 Vdc Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 65°C to 150°C ESD protection, human body model (HBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. recommended operating conditions PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Analog supply voltage 2.2 3.6 V Digital supply voltage 2.2 3.6 V Operating free-air temperature −40 85 °C 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 
     
  
 

 SWRS023B − MAY 2004 − REVISED MARCH 2005 dc electrical characteristics, VCC = 2.7 V, TA = 25°C supply current PARAMETER TEST CONDITIONS Standby current TX current, PA disabled. PLL, VCO, dividers, and reference active TX current‡, PA enabled. PLL, VCO, dividers, reference, and data clock active TYP MAX STDBY low MIN 0.6 4 315-MHz band 12 15 433-MHz band 11 14 868-MHz band 10 12 915-MHz band 10 12 0-dB attenuation 315-MHz band 37 43 10-dB attenuation 315-MHz band 30 20-dB attenuation 315-MHz band 29 0-dB attenuation 433-MHz band 36 10-dB attenuation 433-MHz band 29 20-dB attenuation 433-MHz band 28 0-dB attenuation 868-MHz band 35 10-dB attenuation 868-MHz band 28 20-dB attenuation 868-MHz band 27 0-dB attenuation 915-MHz band 35 10-dB attenuation 915-MHz band 28 20-dB attenuation 915-MHz band 27 UNIT µA mA 42 40 mA 40 ‡ The TX current consumption is dependent upon the external PA matching circuit. The matching network is normally designed to achieve the highest output power at the 0-dB attenuation setting. Changing the external matching components to optimize the output power for other attenuation settings alters the typical current consumption from the typical values noted. digital interface PARAMETER VIH VIL High-level input voltage VOH VOL High-level output voltage TEST CONDITIONS MIN TYP VDD−0.4 0 Low-level input voltage IOH = 0.5 mA IOL = 0.5 mA Low-level output voltage MAX VDD 0.4 VDD−0.4 V V V 0.4 Digital input leakage current UNIT V µA