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LMX2335 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2335
Description  PLLatinum™ Dual Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2335 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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Functional Description (Continued)
Note 9: When the FoLD output is disabled it is actively pulled to a low logic state.
Note 10: 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 RF1/RF2 lock detect mode a locked condition is indicated when RF2 and RF1 are both locked.
Note 11: The Fastlock mode utilized 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 Icpo magnitude bit #17 is selected HIGH (while the #19 and #20 mode bits are set for Fastlock).
Note 12: The Counter Reset mode bits R19 and R20 when activated reset all counters. Upon removal of the Reset bits the N counter resumes counting in “close”
alignment with the R counter. (The maximum error is one prescaler cycle). If the Reset bits are activated the R counter is also forced to Reset, allowing smooth ac-
quisition upon powering up.
SERIAL DATA INPUT TIMING
PHASE COMPARATOR AND INTERNAL CHARGE PUMP CHARACTERISTICS
DS012332-8
Notes: Parenthesis data indicates programmable reference divider data.
Data shifted into register on clock rising edge.
Data is shifted in MSB first.
Test Conditions: The Serial Data Input Timing is tested using a symmetrical waveform around VCC/2. The test waveform has an edge rate of 0.6V/ns with
amplitudes of 2.2V @ VCC = 2.7V and 2.6V @ VCC = 5.5V.
DS012332-9
Notes: Phase difference detection range: −2
π to +2π
The minimum width pump up and pump down current pulses occur at the Do pin when the loop is locked.
www.national.com
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