84427 datasheet(1/17 Pages) RENESAS

Part #	84427

Description	Crystal-to-LVDS Integrated Frequency Synthesizer/Fanout Buffer

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Manufacturer	RENESAS [Renesas Technology Corp]

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Crystal-to-LVDS Integrated

Frequency Synthesizer/Fanout Buffer

84427

DATASHEET

84427 REVISION B 5/6/15

1

GENERAL DESCRIPTION

The

84427

is

a

Cr ystal-to-LVDS

F requency

Synthesizer/Fanout Buffer. The output frequency can be

programmed using the frequency select pins. The low phase

noise characteristics of the 84427 make it an ideal clock source

for 10 Gigabit Ethernet, 10 Gigabit Fibre Channel, OC3 and

OC12 applications.

BLOCK DIAGRAM

PIN ASSIGNMENT

FEATURES

• Six LVDS outputs

• Crystal oscillator interface

• Output frequency range: 77.76MHz to 625MHz

• Crystal input frequency: 19.44MHz, 25MHz or 25.5MHz

• RMS phase jitter at 155.52MHz, using a 19.44MHz crystal

(12kHz to 20MHz): 3.4ps (typical)

Phase noise:

Offset

Noise Power

100Hz ..................-95 dBc/Hz

1kHz ................-110 dBc/Hz

10kHz ................-120 dBc/Hz

100kHz ................-121 dBc/Hz

• 3.3V supply voltage

• 0°C to 70°C ambient operating temperature

• Available in lead-free RoHS-compliant package

Q0:Q5

84427

24-Lead, 300-MIL SOIC

7.5mm x 15.33mm x 2.3mm body package

M Package

Top View

Q0

nQ0

Q1

nQ1

Q2

nQ2

Q3

nQ3

Q4

nQ4

Q5

nQ5

1

2

3

4

5

6

7

8

9

10

11

12

VDD

F_SEL0

F_SEL1

MR

XTAL_IN

XTAL_OUT

F_SEL2

VDDA

VDD

PLL_SEL

GND

VDD

PLL

6/

Feedback

Divider

OSC

6/

Output

Divider

0

1

XTAL_IN

XTAL_OUT

F_SEL2

PLL_SEL

MR

F_SEL0

nQ0:nQ5

24

23

22

21

20

19

18

17

16

15

14

13

F_SEL1

FUNCTION TABLE

Inputs

Output

Frequency

F_XTAL

MR

F_SEL2

F_SEL1

F_SEL0

F_OUT

X1

X

LOW

19.44MHz

0

1

0

77.76MHz

19.44MHz

0

1

0

1

155.52MHz

19.44MHz

0

1

0

311.04MHz

19.44MHz

0

1

622.08MHz

25MHz

0

78.125MHz

25MHz

0

1

156.25MHz

25MHz

0

1

0

312.5 MHz

25MHz

0

1

625MHz

25.5MHz

0

1

159.375MHz

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