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RF96 Datasheet(PDF) 78 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Datasheet(HTML) 78 Page - HOPE Microelectronics CO., Ltd. |
78 / 121 page Page 78 RF96/97/98 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 5.4. Transmitter Description The transmitter of RF96/97/98 comprises the frequency synthesizer, modulator (both LoRaTM and FSK/OOK) and power amplifier blocks, together with the DC biasing and ramping functionality that is provided through the VR_PA block. 5.4.1. Architecture Description The architecture of the RF front end is shown in the following diagram. Figure 40. RF Front-end Architecture Shows the Internal PA Configuration. 5.4.2. RF Power Amplifiers PA_HF and PA_LF are high efficiency amplifiers capable of yielding RF power programmable in 1 dB steps from -4 to +14dBm directly into a 50 ohm load with low current consumption. PA_LF covers the lower bands (up to 525 MHz), whilst PA_HF will cover the upper bands (from 860 MHz). The output power is sensitive to the power supply voltage, and typically their performance is expressed at 3.3V. PA_HP (High Power), connected to the PA_BOOST pin, covers all frequency bands that the chip addresses. It permits continuous operation at up to +17 dBm and duty cycled operation at up to +20dBm. For full details of operation at +20dBm please consult Section 5.4.3 Table 77 Power Amplifier Mode Selection Truth Table PaSelect Mode Power Range Pout Formula 0 PA_HF or PA_LF on RFO_HF or RFO_LF -4 to +15dBm Pout=Pmax-(15-OutputPower) Pmax=10.8+0.6*MaxPower [dBm] 1 PA_HP on PA_BOOST, any frequency +2 to +17dBm Pout=17-(15-OutputPower) [dBm] Notes - For +20 dBm restrictions on operation please consult the following section. - To ensure correct operation at the highest power levels ensure that the current limiter OcpTrim is adjusted to permit delivery of the requisite supply current. - If the PA_BOOST pin is not used it may be left floating. |
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