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TDA5150 Datasheet(PDF) 63 Page - Infineon Technologies AG |
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TDA5150 Datasheet(HTML) 63 Page - Infineon Technologies AG |
63 / 106 page Data Sheet 63 V 1.0, July 2009 TDA 5150 TDA 5150 Functional Description 2.4.11.3 Channel Hopping TDA 5150 offers the possibility for usage of up to 4 preconfigured RF channels, called A, B, C, and D frequency channels. The preconfiguration assumes proper programming PLL’s Multi-Modulus Integer Value registers A/B/C/D (0x09/0x0D/0x11/0x15) and the PLL Fractional Division Ratio registers A/B/C/D (0x0A:0x0C/0x0E:0x10/0x12:0x14/0x16:0x18. Bit-filed <E:F> in Transmit Command is used for frequency channel selection. Thus it is possible to quickly switch between RF frequency channels, without reconfiguration (assuming channels A...D have been preconfigured in advance). Any frequency hop inside the band requires a new Transmit Command and100 µs idle time for the PLL to perform the VCO Auto Calibration and to settle (achieve locked state). For frequency hops to frequencies not more than 1 MHz apart from the frequency on which the VCO Auto Calibration was performed, it is possible to skip the VCO Auto Calibration and thus to reduce the PLL settling time to 20µs instead of 100µs. In this case it is allowed to start the transmission, triggered by a rising edge on the SCK line, by waiting for only 20 µs after the Transmit Command was completed. The VCO Auto Calibration can be skipped by setting the bit FHBLANK (0x1E.7) in SFR GFXOSC (0x1E) to 1. There should be no more than 4 consecutive jumps without VCO Auto Calibration during transmissions. If bit B of the Transmit Command is set, the PA will stay active, until the time-out condition is reached (i.e. for a duration of 65536 / fsys corresponding to ~5 ms for a 13 MHz reference clock) 2.4.11.4 SFRs related to Channel Hopping ADDR 0x1E GFXOSC—Gaussian Filter Configuration Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 FHBLANK reserved reserved reserved GFBYP GFDIV GFDIV GFDIV w/0 w/1 w/1 w/1 w/1 w/0 w/0 w/0 Bit 7 FHBLANK Frequency Hopping VAC Disable FHBLANK Frequency Hopping, enable/disable VCO Auto Calibration for Channel Hopping 0 : enable VCO Auto Calibration (default) 1 : Skip VCO Auto Calibration for frequency hops <1MHz |
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