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PS20039 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 32 page PS20039 Data Sheet 2.1 PLL Registers There are four registers that control the PLL: The PLF bit is the PLL lock detect circuit output. The PLF bit is set after 64 consecutive comparison cycles in lock. A chip-wide reset initializes the lock detect output to 0. The 2[14:8] bits are the MSB bits of the LO Divider divide value. The 2[7:0] bits are the LSB bits of the LO Divider divide value. The division ratio of the LO divider is fully programmable to integer values within the range of 240 to 32767. Note that when the LO Divider divide value is to be changed, the new value is not actually presented to the LO Divider until all of the 15-bit control word 2[14:0] has been programmed. Register 0 and 1 must be therefore be programmed (in any order) before the LO divider is updated even if the only data change is in one of the registers. The C[1:0] bits set the programmed charge pump current . The charge pump current is automatically increased to the next setting dependent on the VCO sub band that has been selected by the VCO tuning algorithm. This is to compensate for changes in VCO gain and so provide consistent PLL performance across all sub bands. Programming the highest charge pump value will not allow the value to be incremented, therefore this value should not be programmed. The value read back for the charge pump current is the actual value in use for the selected sub band. Bit Field Name Default Type Description 7 PLF - R PLL Lock Flag 6:0 2[14:8] 0 R/W MSB bits of LO Divider register Table 3 - Register 0 Bit Field Name Default Type Description 7:0 2[7:0] 0 R/W LSB bits of LO Divider register Table 4 - Register 1 Bit Field Name Default Type Description 7:6 - 0 R/W Test modes 5:4 C[1:0] 0 R/W Charge pump current 3:0 R[3:0] 0 R/W Reference divider ratio Table 5 - Register 2 C[1] C[0] Typ Units 00 400 uA 01 550 uA 10 750 uA 1 1 1000 uA Table 6 - Charge Pump Currents Data Sheet 291467 issue 1 Plessey Semiconductors Ltd. Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE Tel: +44 1793 518000 Fax: +44 1793 518030 Web: www.plesseysemi.com 9 |
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