AXSEM AX5043 Programming Manual
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Contents
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Programming the Chip 37Crystalor TCXO÷LPOSCREFFDLPOSCKFILT LPOSCFREQFigure 14: Low Power Oscillator Calibration LogicWhen enabled (LPOSCCALIBR or LPOSCCALIBF enabled in register LPOSCCONFIG), thecalibration logic is only activated when the crystal oscillator or TCXO is enabled as well. Thisallows “opportunistic” calibration – the Low Power Oscillator is calibrated whenever thereference frequency is enabled.3.8. AU X I L I A RY DACThe AX5043 contains an auxiliary DAC. It can be used to output various receiver signals,such as RSSI or Frequency Ofset, or just a value under program control. The DAC signal canbe output either on the PWRAMP or ANTSEL pad.The DAC may be operated in two modes. ΣΔ mode employs a digital modulator to output ahigh resolution signal. Its output voltage range is ¼ VDDIO to ¾ VDDIO for a DACVALUErange from −2048 to 2047.PWM mode outputs a pulse width modulated signal. It is only suitable for low frequencysignals. Its output voltage range is 0 to VDDIO for a DACVALUE range from −2048 to 2047.PWRAMPor ANTSELRCGNDDAC VoltageFigure 15: DAC RC FilterA low pass filter, such as a simple R-C filter as shown in Figure 15, must be used to obtainthe analog voltage.Version 1.9 Programming Manual AX5043 |
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