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SX1257 Datasheet(PDF) 10 Page - Semtech Corporation |
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SX1257 Datasheet(HTML) 10 Page - Semtech Corporation |
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10 / 38 page  Page 10 SX1257 WIRELESS & SENSING PRODUCTS DATASHEET SX1257 Rev 1 February 2012 ©2012 Semtech Corp. www.semtech.com 2.4. Electrical Specifications The table below gives the electrical specifications of the transceiver under the following conditions: supply Voltage = 3.3 V, temperature = 25 °C, fXOSC = 36 MHz, fRF = 915 MHz, OFDM with 16-QAM, 3/4 rate coded with 26 active tones (IEEE 802.15.4g MR-OFDM Option 3). Output power = -5 dBm (100 ohm differential transmission), TXBWANA = 250 kHz, RXBWANA = 250 kHz, External baseband RX filter = 150 kHz, unless otherwise specified. 2.4.1. Power Consumption 2.4.2. Frequency Synthesis Table 4 Power Consumption Specification Symbol Description Conditions Min Typ Max Units IDDSL Supply Current in Sleep Mode -0.5 1 uA IDDST Supply Current in Standby Mode Crystal oscillator enabled -1.15 1.5 mA IDDRX Supply Current in Receive Mode -20 25 mA IDDTX Supply Current in Transmit Mode RFOutput Power = -5 dBm -58 85 mA Table 5 Frequency Synthesizer Specification Symbol Description Conditions Min Typ Max Units FR Synthesizer Frequency Range Programmable 862 - 1020 MHz FXOSC Crystal Oscillator Frequency See Section 5 32 36 36 MHz TS_OS Crystal Oscillator Wake-up Time From sleep mode - 300 500 us TS_FS RX Frequency Synthesizer Wake-up Time Crystal Oscillator Enabled - 100 150 us FSTEP Frequency Synthesizer Step Size FSTEP = FXOSC / 219 61 68.7 68.7 Hz TS_HOP_RX RX Frequency Synthesizer Hop Time (to within 10 kHz of target frequency) 200 kHz step 400 kHz step 1.2 MHz step 25 MHz step - - - - tbd tbd tbd tbd - - - - us us us us TS_HOP_TX RX Frequency Synthesizer Hop Time (to within 10 kHz of target frequency) 200 kHz step 400 kHz step 1.2 MHz step 25 MHz step - - - - tbd tbd tbd tbd - - - - us us us us |
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