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LMX2430 Datasheet(PDF) 46 Page - National Semiconductor (TI) |
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LMX2430 Datasheet(HTML) 46 Page - National Semiconductor (TI) |
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46 / 49 page  2.0 Programming Description (Continued) 2.9 R5 REGISTER The R5 Register contains the IF_TOC control word. The IF_TOC is used to setup the IF syhnthesizer’s Fastlock circuitry. The IF_TOC is a 12-bit binary counter programmable from 0 to 4095. Reg 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9876543210 DATA[20:0] FIELD ADDRESS [2:0] FIELD R5 000000000 IF_TOC[11:0] 1 0 1 2.9.1 IF_TOC[0:11] - IF Synthesizer Timeout Counter (R5[14:3]) The OSCout/ FLoutIF pin can be configured as a general purpose CMOS TRI-STATE output or as a Fastlock output by programming the IF_TOC appropriately. When the IF_TOC is programmed from 0 to 3, Automatic Fastlock is disabled, and the OSCout/ FLoutIF pin is configured as a general purpose CMOS TRI-STATE output or Manual Fastlock is enabled. When the IF_TOC is programmed to 0, the OSCout/ FLoutIF pin will be in TRI-STATE (high impedance) mode. The charge pump current is then the value specified by IF_CPG (R3[19]). When the IF_TOC is programmed to 1, the OSCout/ FLoutIF pin is pulled to a LOW state. The charge pump current is then set to a HIGH gain state (IF_CPG bit = 1). This condition is known as the Manual Fastlock. When the IF_TOC is programmed to 2, the OSCout/ FLout_IF pin will again be pulled to a LOW state, but this time the charge pump current is the value specified by IF_CPG (R3[19]). When the IF_TOC is programmed to 3, the OSCout/ FLoutIF pin is pulled to a HIGH state. Again, the charge pump current is the value specified by IF_CPG (R3[19]). When the IF_TOC is programmed from 4 to 4095, Fastlock is enabled and the OSCout/ FLoutIF pin is pulled to a LOW state. Fastlock will time-out after the specified number of PFD events. At this time, the OSCout/ FLoutIF pin will switch to TRI-STATE (high impedance) mode. The value programmed into IF_TOC represents the number of PFD events that the IF synthesizer will spend in the Fastlock state. Note that any write to the IF_TOC requires a PFD event on the IF synthesizer to latch the contents. This means that writes to the IF_TOC take effect synchronously with the next PFD event. IF_TOC[11:0] FastLock Mode Fastlock Period [PFD Events] OSCout/ FLoutIF Pin Functionality/ State I CPoutIF Magnitude 0 Disabled N/A General Purpose. High Impedance State I CPoutIF magnitude controlled by R3[19] 1 Enabled Manual Fastlock N/A General Purpose. Logic LOW State I CPoutIF =4 mA 2 Disabled N/A General Purpose. Logic LOW State I CPoutIF magnitude controlled by R3[19] 3 Disabled N/A General Purpose. Logic HIGH State I CPoutIF magnitude controlled by R3[19] 4 Enabled Automatic Fastlock 4 FastLock. Logic LOW State. Switches to High Impedance after 4 PFD events I CPoutIF =4 mA Switches to 1 mA after 4 PFD events … ……… … 4095 Enabled Automatic Fastlock 4095 FastLock. Logic LOW State. Switches to High Impedance after 4095 PFD events I CPoutIF =4 mA Switches to 1 mA after 4095 PFD events www.national.com 46 |
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