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AX8052F143-1 Datasheet(PDF) 8 Page - ON Semiconductor |
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AX8052F143-1 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 45 page AX8052F143 www.onsemi.com 8 Table 4. SUPPLIES Units Max Typ Min Condition Description Sym IRX−SE Current consumption TX single ended 868 MHz, 0 dBm, FSK, Note 3 RF frequency generation subsystem: Internal VCO and internal loop−filter Antenna configuration: Single ended PA, external RX/TX switching 7.5 mA IMCU Microcontroller running power consumption All peripherals disabled 150 mA/ MHz IVSUP Voltage supervisor Run and standby mode 85 mA ILPXTAL Crystal oscillator current (RF reference oscillator) 16 MHz 160 mA ILFXTAL Low frequency crystal oscillator current 32 kHz 700 nA IRCOSC Internal oscillator current 20 MHz 210 mA ILPOSC Internal Low Power Oscillator current 10 kHz 650 nA 640 Hz 210 nA IADC ADC current 311 kSample/s, DMA 5 MHz 1.1 mA IWOR Typical wake−on−radio duty cycle current 1s, 100 kbps 6 mA 1. If VDD_IO ramps cannot be guaranteed, an external reset circuit is recommended, see the AX8052 Application Note: Power On Reset 2. Digital circuitry is functional down to typically 1 V. 3. Measured with optimized matching networks. For information on current consumption in complex modes of operation tailored to your application, see the software AX−RadioLab. Note on current consumption in TX mode To achieve best output power the matching network has to be optimized for the desired output power and frequency. As a rule of thumb a good matching network produces about 50% efficiency with the AX8052F143 power amplifier although over 90% are theoretically possible. A typical matching network has between 1 dB and 2 dB loss (Ploss). The theoretical efficiencies are the same for the single ended PA (ANTP1) and differential PA (ANTP and ANTN) therefore only one current value is shown in the table below. We recommend to use the single ended PA for low output power and the differential PA for high power. The differential PA is internally multiplexed with the LNA on pins ANTP and ANTN. Therefore constraints for the RX matching have to be considered for the differential PA matching. The current consumption can be calculated as ITX[mA] + 1 PAefficiency 10 Pout[dBm])Ploss[dB] 10 B 1.8V ) Ioffset Ioffset is about 6 mA for the fully integrated VCO at 400 MHz to 1050 MHz, and 3 mA for the VCO with external inductor at 169 MHz. The following table shows calculated current consumptions versus output power for Ploss = 1 dB, PAefficiency = 0.5, Ioffset= 6 mA at 868 MHz and Ioffset= 3.5 mA at 169 MHz. Table 5. CURRENT CONSUMPTION VS. OUTPUT POWER Pout [dBm] Itxcalc [mA] 868 MHz 169 MHz 0 7.5 4.5 1 7.9 4.9 2 8.4 5.4 3 9.0 6.0 4 9.8 6.8 5 10.8 7.8 6 12.1 9.1 7 13.7 10.7 8 15.7 12.7 9 18.2 15.2 10 21.3 18.3 11 25.3 22.3 12 30.3 27.3 13 36.7 33.7 14 44.6 41.6 15 54.6 51.6 Both AX8052F143 power amplifiers run from the regulated VDD_ANA supply and not directly from the battery. This has the advantage that the current and output power do not vary much over supply voltage and temperature. |
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