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SX1242 Datasheet(PDF) 6 Page - Semtech Corporation |
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SX1242 Datasheet(HTML) 6 Page - Semtech Corporation |
6 / 14 page SX1242, Rev 1, November 2010 ©2010 Semtech Corp. SX1242 www.semtech.com Page 6 Integrated Transmitter IC ADVANCED COMMUNICATIONS & SENSING DATASHEET 2.4. Electrical Specifications The table below gives the electrical specifications of the transmitter under the following conditions: Supply voltage = 3.3 V, temperature = 25 °C, fXOSC = 26 MHz, fRF = 344.94 MHz, bit rate = 5 kbit/s and output power = +12 dBm terminated in a matched 50 ohm impedance, unless otherwise specified. Table 4 Transmitter Specifications * Logic “1” transmission indicated by transmission of carrier frequency at power level RFOP. ** Ramp-up time of the internal regulator turning the PA on. The typical 10% - 90% power ramp-up time is 10us Symbol Description Conditions Min Typ Max Unit Current Consumption IDDSL Supply current in sleep mode - 0.5 1 µA IDDT Supply current in transmit mode with appropriate external match- ing. Logic “1” or “Mark” frequency trans- mitted* -22- mA RF and Baseband Specifications BRO Bit rate, OOK Permissible range 0.5 - 10 kbps OOK_B OOK modulation depth - 50 - dB RFOP RF output power into 50 ohms Optimized matching network 9 12 - dBm DRFOPV Variation in RF output power with supply voltage 2.5 V to 3.3 V 1.8 V to 3.7 V - - - - 3 7 dB dB PHN Transmitter phase noise 100 kHz Offset from carrier - - -76 dBc/Hz FCN Carrier frequency - 344.94 - MHz FXOSC Crystal Oscillator Frequency 26 26 26 MHz DFXOSC Frequency Variation of the Oscilla- tor Circuit No crystal contribution - - +/-25 ppm Timing Specifications TS_TR Time from Sleep to Tx mode - - 2 ms RAMP PA Ramp up and down time** - 20 - us |
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