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74HCT9046A Datenblatt(PDF) 11 Page - NXP Semiconductors |
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74HCT9046A Datenblatt(HTML) 11 Page - NXP Semiconductors |
11 / 40 page 1999 Jan 11 11 Philips Semiconductors Product specification PLL with bandgap controlled VCO 74HCT9046A MBD047 - 1 SIG IN COMPIN VCO OUT high impedance OFF state, (zero current) UP DOWN CURRENT AT PC2 OUT PC2 /VCO OUT IN PCPOUT OPC IN Fig.10 Timing diagram for PC2. The pulse overlap of the up and down signals (typically 15 ns). Fig.11 The response of a locked-loop in the vicinity of the zero crossing of the phase error. b. Response with current switch charge-pump PC2OUT as applied in the HCT9046A. MBD043 25 2.50 2.75 2.25 VCO IN 025 phase error (ns) (1) (1) (2) 25 2.50 2.75 2.25 VCO IN 025 phase error (ns) a. Response with traditional voltage-switch charge-pump PC2OUT (4046A). (1) Due to parasitic capacitance on PC2OUT. (2) Backlash time (dead zone). b. a. |
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