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LMX2330A Datasheet(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2330A
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)

LMX2330A Datasheet(HTML) 16 Page - National Semiconductor (TI)

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Application Information (Continued)
FASTLOCK CIRCUIT IMPLEMENTATION
A diagram of the Fastlock scheme as implemented in Na-
tional Semiconductors LMX233xA PLL is shown in
Figure 5.
When a new frequency is loaded, and the RF Icp
o bit is set
high the charge pump circuit receives an input to deliver 4
times the normal current per unit phase error while an open
drain NMOS on chip device switches in a second R2 resistor
element to ground. The user calculates the loop filter compo-
nent values for the normal steady state considerations. The
device configuration ensures that as long as a second iden-
tical damping resistor is wired in appropriately, the loop will
lock faster without any additional stability considerations to
account for. Once locked on the correct frequency, the user
can return the PLL to standard low noise operation by send-
ing a MICROWIRE instruction with the RF Icp
o bit set low.
This transition does not affect the charge on the loop filter
capacitors and is enacted synchronous with the charge
pump output. This creates a nearly seamless change be-
tween Fastlock and standard mode.
DS012331-29
FIGURE 4. Open Loop Response Bode Plot
DS012331-30
FIGURE 5. Fastlock PLL Architecture
www.national.com
16


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