STX210A--集成编码功能大功率发射芯片.docx

STX210AOOK/ASK/TransmitterDescriptionSTX210A is one OOK/ASK transmitter with integrated transmitting data encoder. The circuit working frequency range is about 200MHz-500MHz. The encoder has single external input enable pin. The transmitted bit pattern is consistent with XX1527 encoder.STX210A integrates most transmitter components on-chip and only requires a few external components to work as a transmitter. The STX210A has transmission data encoder, low supply detection, and long-time mis-transmission shutdown protection features.FeaturesWorking frequency range： 200MHz-500MHz. Tunable output power: 15dBm 5V with 50 ohm load, typ. Transmitted data pattern consistent with XX1527 encoder. Wide supply voltage: 2.3V-5.5V for 315/433MHz. Low supply voltage detection Automatic shutdown protection Applications Wireless Door-bell. Remote Control, Garage door and gate openers AMR-Automatic Meter Reading Wireless alarm and security system. Block Diagram锐迪芯电子STX210AOOK/ASK/TransmitterPin ConfigurationTable 1. Pin DescriptionPinSymbolI/ODescription1VSSAIORF Gound2POUTOTransmitted RF output, can stand 20V DC voltage.3VDCCLDO Power for dig part, connected ext bypass cap.4RATEIOExt connected res， Control TX data rate5D1ITransmit input control, active high, default low6VACCIOLDO Power for RF part, connected ext bypass cap.7VDDAIOVdd for whol chip8XIIInput terminal of local oscillation signal. It is connected tothe crystal or driven by an external clock.Table 2. Absolute Maximum RatingItemRatingSupply Voltage, VDD+ 5.6VInputs and Clock Outputs- 0.5V to + 5.6VPout pin-0.5V to +20VStorage Temperature- 65 to + 150 oCSoldering Temperature+ 260 oCSTX210AOOK/ASK/TransmitterTable 3. Electrical SpecificationsParameterSymbolTest ConditionMinTypMaxUnitSupplyV2.25.5VVoltage200MHz-500MHzDDSupplyIFout=434MHz, 13dBm , 3V15mACurrentDDFout=434MHz, 18dBm , 5V25mARF PowerPratio200MHz-500MHzdBOn/Off Ratio60Pout supplyPvol200MHz-500MHz12VvoltageTransmittedPoutFin=315MHz , Vdd=5V20dBmPowerFin=434MHz , Vdd=5V20dBmData RateOOK/ASK mode0.520Kb/sOSCIoperatingF91020MHzFrequencyOSCOperatingT-402785TemperatureaLeakageIPower down mode1uACurrentSBTypical Application Circuit I 315/433MHz TransmitterSTX210AOOK/ASK/TransmitterFunctional DescriptionCrystal OscillatorThe crystal oscillator circuit consists of a colpit oscillator. Pin 8 can drive one off-chip 9MHz-30MHz crystal without external capacitors required. The driving capacitors are integrated on Chip.The crystal driver stage can also take input clock as input clock buffer. The crystal oscillator frequency is determined as followsfosc= fvco / 32Where Fvco is VCO oscillation frequency. 32 is PLL divider value. Below table lists the required Crystal frequency. The suggested crystal ESR must be less than 50.Transmitting FrequencyCrystal FrequencyNote(MHz)(MHz)3159.84434010.62539012.188433.9213.56PLL BlockThe PLL consists of phase-frequency detector (PFD), charge pump, loop filter, voltage-controlled oscillator (VCO), and divider (32). The PFD compares two signals and produces an error signal which is proportional to the two signal phase difference. The error signal is used to control the VCO to run fast or slow.The VCO oscillation frequency range is tunable between200MHz-500MHz.OOK/ASK ModulationThe OOK/ASK modulation is done by external Pin D1. D1 turn on/off the power amplifier when D1 is high or low. The PLL loop is on no matter DIN is high and low. However, to save power, the whole chip is turned off after D1 stay in low over one million crystal oscillation cycles. That is about 100ms for 10MHz crystal. When D1 is high, the whole chip is powered up. The On/Off power ratio is larger than 60dB.STX210AOOK/ASK/TransmitterTX RATE CONTROLThe transmitting rate is controllable with external control pin RATE connected with different resistor. Below table lists the transmitting rate with different ext resistor. The bit rate changes less with supply voltage.Table x The transmitting time vs external resistor when pins D1 is hold at high.Ext ResistorVcc=2.5V ,Vcc=2.5V ,note(K.)1T Bit widthBit Rate(ms),(kb/s)2200.128.03300.166.04700.254.06900.343.010000.502.0Fig. 1 Transmitting bit rate vs Supply voltage and ext bias resistor.STX210AOOK/ASK/TransmitterRF OUTPUTThe ANT pin can be matched to 50 Ohm with a -type circuit. The supply voltage can be as high as 12V. Below table is suggested inductor and capacitor value for different frequency.FrequencyL1L2C1C2C3C4R1Note(MHz)(nH)(nH)(uF)(pF)(pF)(pF)()3154701001.0NCNC10100433470821.0NCNC5100ENCODERT