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LMX2332LTMX Datasheet(PDF) 16 Page - National Semiconductor (TI) |
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LMX2332LTMX Datasheet(HTML) 16 Page - National Semiconductor (TI) |
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16 / 23 page  Functional Description (Continued) TABLE 3. The F oLD (Pin 10) Output Truth Table RF R[19] IF R[19] RF R[20] IF R[20] F o Output State (RF LD) (IF LD) (RF F o) (IF F o) 0 0 0 0 Disabled (Note 12) 0 1 0 0 IF Lock Detect (Note 13) 1 0 0 0 RF Lock Detect (Note 13) 1 1 0 0 RF/IF Lock Detect (Note 13) X 0 0 1 IF Reference Divider Output X 0 1 0 RF Reference Divider Output X 1 0 1 IF Programmable Divider Output X 1 1 0 RF Programmable Divider Output 0 0 1 1 Fastlock (Note 14) 0 1 1 1 IF Counter Reset (Note 15) 1 0 1 1 RF Counter Reset (Note 15) 1 1 1 1 IF and RF Counter Reset (Note 15) X = don’t care condition Note 12: When the FoLD output is disabled, it is actively pulled to a low logic state. Note 13: Lock detect output provided to indicate when the VCO frequency is in “lock.” When the loop is locked and a lock detect mode is selected, the pins output is HIGH, with narrow pulses LOW. In the RF/IF lock detect mode a locked condition is indicated when RF and IF are both locked. Note 14: The Fastlock mode utilizes the FoLD output pin to switch a second loop filter damping resistor to ground during fastlock operation. Activation of Fastlock occurs whenever the RF loop’s lcpo magnitude bit #17 is selected HIGH (while the #19 and #20 mode bits are set for Fastlock). Note 15: The IF Counter Reset mode resets IF PLL’s R and N counters and brings IF charge pump output to a TRI-STATE condition. The RF Counter Reset mode resets RF PLL’s R and N counters and brings RF charge pump output to a TRI-STATE condition. The IF and RF Counter Reset mode resets all counters and brings both charge pump outputs to a TRI-STATE condition. Upon removal of the Reset bits then N counter resumes counting in “close” alignment with the R counter. (The maximum error is one prescaler cycle.) POWERDOWN OPERATION Synchronous and asynchronous powerdown modes are both available by MICROWIRE selection. Synchronously powerdown occurs if the respective loop’s R18 bit (Do TRI-STATE) is LOW when its N20 bit (Pwdn) becomes HI. Asynchronous powerdown occurs if the loop’s R18 bit is HI when its N20 bit becomes HI. In the synchronous powerdown mode, the powerdown function is gated by the charge pump to prevent unwanted frequency jumps. Once the powerdown program bit N20 is loaded, the part will go into powerdown mode when the charge pump reaches a TRI-STATE condition. In the asynchronous powerdown mode, the device powers down immediately after the LE pin latches in a HI condition on the powerdown bit N20. Activation of either the IF or RF PLL powerdown conditions in either synchronous or asynchronous modes forces the respective loop’s R and N dividers to their load state condition and debiasing of its respective f IN input to a high impedance state. The oscillator circuitry function does not become disabled until both IF and RF powerdown bits are activated. The MICROWIRE control register remains active and capable of loading and latching data during all of the powerdown modes. The device returns to an actively powered up condition in either synchronous or asynchronous modes immediately upon LE latching LOW data into bit N20. Powerdown Mode Select Table R18 N20 Powerdown Status 0 0 PLL Active 1 0 PLL Active (Charge Pump Output TRI-STATE) 0 1 Synchronous Powerdown Initiated 1 1 Asynchronous Powerdown Initiated www.national.com 16 |
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