74HCT9046AD datasheet(10/40 Pages) PHILIPS

Part #	74HCT9046AD

Description	PLL with bandgap controlled VCO

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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10 / 40 page

1999 Jan 11

10

Philips Semiconductors

Product speciﬁcation

PLL with bandgap controlled VCO

74HCT9046A

MBD099

R3'

I P

up

down

C2

VCC

PC2 OUT

VC2 OUT

Fig.8 The current switch charge pump output of PC2.

b.

a.

MBD046 - 1

PC2 OUT

C2

VCC

I P

down

up

∆ Φ = Φ

pulse overlap of

approximately 15 ns

PCIN

a. At every

∆Φ, even at zero ∆Φ both switches are closed simultaneously for a short period (typically 15 ns).

b. Comparable voltage-controlled switch.

0

MSB306 - 1

20

1/2V

0

V

VDEMOUT(AV)

CC

π

Φ PCIN

2

π

I

x R

P

Φ PCIN = Φ SIGIN Φ COMPIN

20

π

Φ PCIN

2

π

I P

Fig.9 Phase comparator 2.

Two kinds of transfer functions may be regarded:

a. The current transfer:

b. The voltage transfer; this transfer can be observed at PC2OUT by connecting a resistor (R = 10 kΩ) between PC2OUT and 1⁄2VCC;

pump current

I

P

2

π

-------

Φ

PCIN

V

DEMOUT

V

PC2OUT

5

4

π

-------

Φ

PCIN

==

b.

a.

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74HCT9046AD Datasheet(PDF) 10 Page - NXP Semiconductors

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