74HCT9046A 데이터 시트보기 (PDF) - Philips Electronics

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74HCT9046A

PLL with bandgap controlled VCO

Philips Electronics 

Philips Semiconductors

PLL with bandgap controlled VCO

Product specification

74HCT9046A

SIG IN

COMP IN

VCO OUT

UP

DOWN

OPC IN

CURRENT AT

PC2 OUT

PC2 OUT /VCO IN

high impedance OFF state,

(zero current)

PCPOUT

The pulse overlap of the up and down signals (typically 15 ns).

Fig.10 Timing diagram for PC2.

MBD047 - 1

2.75

VCO IN

2.50

(1)

(1)

(2)

2.75

VCO IN

2.50

2.25

25

0

25

phase error (ns)

a.

2.25

25

0

25

phase error (ns)

MBD043

b.

a. Response with traditional voltage-switch charge-pump PC2OUT (4046A).

(1) Due to parasitic capacitance on PC2OUT.

(2) Backlash time (dead zone).

b. Response with current switch charge-pump PC2OUT as applied in the HCT9046A.

Fig.11 The response of a locked-loop in the vicinity of the zero crossing of the phase error.

1999 Jan 11

11

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