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LMX2335 Datasheet(PDF) 11 Page - Texas Instruments |
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LMX2335 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page Functional Description (Continued) TABLE 1. Programmable Modes C1 C2 R16 R17 R18 R19 R20 0 0 RF2 Phase Detector Polarity RF2 I CPo RF2 D o TRI-STATE RF2 LD RF2 F o 0 1 RF1 Phase Detector Polarity RF1 I CPO RF1 D o TRI-STATE RF1 LD RF1 F o C1 C2 N19 N20 10 RF2 Prescaler Pwdn RF2 11 RF1 Prescaler Pwdn RF1 TABLE 2. Mode Select Truth Table Phase Detector Polarity (Note 7) D oTRI-STATE I CPo (Note 5) RF1 Prescaler RF2 Prescaler Pwdn (Note 6) 0 Negative Normal Operation LOW 64/65 64/65 pwrd up 1 Positive TRI-STATE HIGH 128/129 128/129 pwrd dn Note 5: The ICPo LOW current state = 1/4 x ICPo HIGH current. Note 6: Activation of the RF2 PLL or RF1 PLL powerdown modes result in the disabling of the respective N counter divider and debiasing of its respective fIN inputs (to a high impedance state). The powerdown function is gated by the charge pump to prevent unwanted frequency jumps. Once the powerdown program mode is loaded, the part will go into powerdown mode when the charge pump reaches a TRI-STATE condition. The R counter and Oscillator functionality does not become disabled until both RF2 and RF1 powerdown bits are activated. The OSCin is connected to VCC through 100 kΩ resistor and the OSCout goes HIGH when this con- dition exists. The MICROWIRE control register remains active and capable of loading and latching data during all of the powerdown modes. Note 7: PHASE DETECTOR POLARITY Depending upon VCO characteristics, the R16 bits should be set accordingly: When VCO characteristics are positive like (1), R16 should be set HIGH; When VCO characteristics are negative like (2), R16 should be set LOW. Note 8: TABLE 3. The F oLD Output Truth Table RF1 R[19] (RF1 LD) RF2 R[19] (RF2 LD) RF1 R[20] (RF1 F o) RF2 R[20] (RF2 F o) F oLD Output State 0000 Disabled (Note 9) 0100 RF2 Lock Detect (Note 10) 1000 RF1 Lock Detect (Note 10) 1100 RF1/RF2 Lock Detect (Note 10) X 0 0 1 RF2 Reference Divider Output X 0 1 0 RF1 Reference Divider Output X 1 0 1 RF2 Programmable Divider Output X 1 1 0 RF1 Programmable Divider Output 0011 Fastlock (Note 11) 0111 For Internal use only 1011 For Internal use only 1111 Counter Reset (Note 12) X — don’t care condition VCO Characteristics DS012332-7 www.national.com 10 |
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