2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL
Preliminary Information
SP5848
SP5848
2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL Preliminary Information
DS5076 Is...
Description
Preliminary Information
SP5848
SP5848
2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL Preliminary Information
DS5076 Issue 1.6 October 1999
Features
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Ordering Information
SP5848/KG/QP1S SP5848/KG/QP1T
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Dual independent PLL frequency synthesisers in a single package, optimised for double conversion cable tuners, offering improved application 2.2GHz up-synthesiser optimised for low phase noise up to comparison frequencies of 4MHz 1.3GHz down-synthesiser optimised for low phase noise AND small step size Common reference oscillator and divider with independently selectable ratios for each synthesiser 10:1 programmable charge pump current ratio in up synthesiser 3-Wire bus programmable, each synthesiser indepently addressable Low power consumption, typ 100mW at 5V ESD protection, (Normal ESD handling procedures should be observed)
Description
The SP5848 is a dual PLL frequency synthesizer controlled by a 3-wire bus optimised for application in double conversion tuners. Each synthesiser loop within the SP5848 is independently addressable and contains an RF programmable divider, phase/frequency detector and charge pump/loop amplifier section; a common reference frequency oscillator and divider chain is provided, whose ratios for each loop are independently programmable. Both synthesisers are optimised for low phase noise performance and in addition synthesiser 2 is capable of operation with a low comparison frequency.
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Applications
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TV, VCR, and cable tuning s...
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