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1、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 integ
2、rates 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.Features Working frequency range： 200MHz-500MHz. Tunable output
3、 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
4、 Reading Wireless alarm and security system. Block Diagram锐迪芯电子STX210AOOK/ASK/TransmitterPin ConfigurationTable 1. Pin DescriptionPin Symbol I/O Description1 VSSA IO RF Gound2 POUT O Transmitted RF output, can stand 20V DC voltage.3 VDCC LDO Power for dig part, connected ext bypass cap.4 RATE IO Ext
5、 connected res， Control TX data rate5 D1 I Transmit input control, active high, default low6 VACC IO LDO Power for RF part, connected ext bypass cap.7 VDDA IO Vdd for whol chip8 XI I Input terminal of local oscillation signal. It is connected tothe crystal or driven by an external clock.Table 2. Abs
6、olute Maximum RatingItem RatingSupply 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 SpecificationsParameter Symbol Test Condition Min Typ Max UnitSupply
7、 V 2.2 5.5 VDDVoltage 200MHz-500MHzSupply Fout=434MHz, 13dBm , 3V 15 mAIDDCurrent Fout=434MHz, 18dBm , 5V 25 mARF Power Pratio 200MHz-500MHz dBOn/Off Ratio 60Pout supply Pvol 200MHz-500MHz 12 VvoltageTransmitted Fin=315MHz , Vdd=5V 20 dBmPoutPower Fin=434MHz , Vdd=5V 20 dBmData Rate OOK/ASK mode 0.5
8、 20 Kb/sOSCIoperating F 9 10 20 MHzOSCFrequencyOperating T -40 27 85 aTemperatureLeakage I Power down mode 1 uASBCurrentTypical Application Circuit I 315/433MHz TransmitterSTX210AOOK/ASK/TransmitterFunctional DescriptionCrystal OscillatorThe crystal oscillator circuit consists of a colpit oscillator
9、. 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 os
10、cillation frequency. 32 is PLL divider value. Below table lists the required Crystal frequency. The suggested crystal ESR must be less than 50.Transmitting Frequency Crystal Frequency Note(MHz) (MHz)315 9.844340 10.625390 12.188433.92 13.56PLL BlockThe PLL consists of phase-frequency detector (PFD),
11、 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
12、 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 c
13、rystal 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.
14、 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 Resistor Vcc=2.5V , Vcc=2.5V , note(K.) 1T Bit width Bit Rate(ms), (kb/s)220 0.12 8.0330 0.16 6.0470
15、 0.25 4.0690 0.34 3.01000 0.50 2.0Fig. 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 dif
16、ferent frequency.Frequency L1 L2 C1 C2 C3 C4 R1 Note(MHz) (nH) (nH) (uF) (pF) (pF) (pF) ()315 470 100 1.0 NC NC 10 100433 470 82 1.0 NC NC 5 100ENCODERThe chip integrates the control data encoder. The transmitted data pattern is encoded within the internal OTP encoder. The data pattern is consistent with market available product XX1527.STX210AOOK/ASK/TransmitterPackage Information SOP-8
