ICS840051AGLFT中文资料

LVCMOS/LVTTL C LOCK G ENERATOR

G ENERAL D ESCRIPTION

The ICS840051 is a G igabit Ethernet Clock Generator and a member of the HiPerClocks TM

family of high performance devices from ICS.The ICS840051 can synthesize 10 G igabit Ethernet, SONET, or Serial ATA reference clock

frequencies with the appropriate choice of crystal and output divider. The ICS840051 has excellent phase jitter performance and is packaged in a small 8-pin TSSOP ,making it ideal for use in systems with limited board space.

F EATURES

?1 LVCMOS/L VTTL output, 15? output impedance ?Crystal oscillator interface designed for 18pF parallel resonant crystals ?Output frequency range: 70MHz - 170MHz ?VCO range: 560MHz - 680MHz

?RMS phase jitter at 155.52MHz (1.875MHz - 20MHz):0.48ps (typical)?RMS phase noise at 155.52MHz Offset Noise Power

100Hz...............-99.7 dBc/Hz 1KHz................-120 dBc/Hz 10KHz................-128 dBc/Hz 100KHz................-127 dBc/Hz ?3.3V operating supply

?0°C to 70°C ambient operating temperature ?Lead-Free fully RoHS compliant

?Industrial temperature information available upon request

ICS840051

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm

package body G Package T op View

V DDA OE

XTAL_OUT XTAL_IN 1234

V DD Q0GND

FREQ_SEL

8765

B LOCK D IAGRAM

F REQUENCY T ABLE

s

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7P IN A SSIGNMENT

LVCMOS/LVTTL C LOCK G ENERATOR

T ABLE 2. P IN C HARACTERISTICS

T ABLE 1. P IN D ESCRIPTIONS

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o i t p i r c s e D 1V A D D r e w o P .

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B 3e l b a T e e S .s l e v e l e c a f r e t n i L T T V L /S O M

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n o i t i d n o C t s e T m

u m i n i M l a c i p y T m

u m i x a M s t i n U C N I e

c n a t i c a p a C t u p n I 4F p C D P e c n a t i c a p a C n o i t a p i s s i D r e w o P V D D V ,A D D V 564.3=7F p R P U L L U P r o t s i s e R p u l l u P t u p n I 15K ?R N W O D L L U P r o t s i s e R n w o

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T ABLE 3A. C ONTROL F UNCTION T ABLE

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u p n I l o r t n o C t u p t u O E O 0Q 0Z -i H 1

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v i t c A T ABLE 3B. FREQ_SEL F UNCTION T ABLE

t u p n I l o r t n o C r e d i v i D N L

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F 0)

t l u a f e d (4÷1

8

÷

LVCMOS/LVTTL C LOCK G ENERATOR

T ABLE 4A. P OWER S UPPLY DC C HARACTERISTICS , V DD = V DDA = 3.3V±5%, T A = 0°C TO 70°C

l o b m y S r

e t e m a r a P s

n o i t i d n o C t s e T m u m i n i M l a c i p y T m u m i x a M s t i n U V D D e g a t l o V y l p p u S e r o C 531.33.3564.3V V A D D e g a t l o V y l p p u S g o l a n A 5

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D D t

n e r r u C y l p p u S g o l a n A 0

1A

m T ABLE 5. C RYSTAL C HARACTERISTICS

A BSOLUTE M AXIMUM R ATINGS

Supply Voltage, V DD 4.6V

Inputs, V I -0.5V to V DD + 0.5 V Outputs, V O

-0.5V to V DD + 0.5V Package Thermal Impedance, θJA 101.7°C/W (0 mps)Storage T emperature, T STG

-65°C to 150°C

NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions be-yond those listed in the DC Characteristics or AC Character-istics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.

T ABLE 4B. LVCMOS/LVTTL DC C HARACTERISTICS , V DD = V DDA = 3.3V±5%, T A = 0°C TO 70°C

l o b m y S r e t e m a r a P s

n o i t i d n o C t s e T m

u m i n i M l

a c i p y T m u m i x a M s t i n U V H I e g a t l o V h g i H t u p n I 2V D D 3.0+V V L I e g a t l o V w o L t u p n I 3

.0-8.0V I H I t n e r r u C h g i H t u p n I E O V D D V =N I V 564.3=5A μL E S _Q E R F V D D V =N I V 564.3=0

51A μI L I t

n e r r u C w o L t u p n I E O V D D V ,V 564.3=N I V 0=051-A μL

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"t i u c r i C t s e T d a o L t u p t u O V 3.3"r e t e m a r a P s

n o i t i d n o C t s e T m

u m i n i M l a c i p y T m

u m i x a M s

t i n U n o i t a l l i c s O f o e d o M l

a t n e m a d n u F y

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LVCMOS/LVTTL C LOCK G ENERATOR

T ABLE 6. AC C HARACTERISTICS, V

DD = V

DDA

= 3.3V±5%, T A = 0°C TO 70°C

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LVCMOS/LVTTL C LOCK G ENERATOR

T YPICAL P HASE N OISE AT 155.52MH Z

0-10-20-30-40-50

-60-70-80-90-100-110-120-130-140-150-160

-170-180-190

O FFSET F REQUENCY (H Z )

N O I S E P O W E R d B c H z

Phase Noise Result by adding 10GigE Filter to raw data

Raw Phase Noise Data

10GigE Filter

??

?155.52MHz

RMS Phase Jitter (Random)

1.875Mhz to 20MHz = 0.48ps (typical)

100

1k

10k

100k

1M

10M

100M

T YPICAL P HASE N OISE AT 77.76MH Z

0-10-20-30-40-50

-60-70-80-90-100-110-120-130-140-150-160

-170-180-190

O FFSET F REQUENCY (H Z )

N O I S E P O W E R d B c H z

Phase Noise Result by adding 10GigE Filter to raw data

Raw Phase Noise Data

10GigE Filter

?

?

?

77.76MHz

RMS Phase Jitter (Random)

1.875Mhz to 20MHz = 0.45ps (typical)

100

1k 10k 100k

1M

10M

100M

LVCMOS/LVTTL C LOCK G ENERATOR P ARAMETER M EASUREMENT I NFORMATION

LVCMOS/LVTTL C LOCK G ENERATOR

A PPLICATION I NFORMATION

C RYSTAL I NPUT I NTERFACE

The ICS840051 has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 2 below were determined using an 18pF parallel reso-nant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts.

As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS840051 provides separate power supplies to isolate any high switching noise from the out-puts to the internal PLL. V DD and V DDA should be individually con-nected to the power supply plane through vias, and bypass ca-pacitors should be used for each pin. To achieve optimum jitter performance, power supply isolation is required. Figure 1illustrates how a 10? resistor along with a 10μF and a .01μF bypass capacitor should be connected to each V DDA pin.

P OWER S UPPLY F ILTERING T ECHNIQUES

IGURE OWER UPPL Y ILTERING

LVCMOS/LVTTL C LOCK G ENERATOR

R ELIABILITY I NFORMATION

T RANSISTOR C OUNT

The transistor count for ICS840051 is: 1927

T ABLE 7. θJA VS . A IR F LOW T ABLE FOR 8 L EAD TSSOP

θJA by Velocity (Meters per Second)

1

2.5

Multi-Layer PCB, JEDEC Standard Test Boards

101.7°C/W

90.5°C/W

89.8°C/W

LVCMOS/LVTTL C LOCK G ENERATOR

P ACKAGE O UTLINE - G S UFFIX FOR 8 L EAD TSSOP

T ABLE 8. P ACKAGE D IMENSIONS

Reference Document: JEDEC Publication 95, MO-153

L

O B M Y S s

r e t e m i l l i M m

u m i n i M m

u m i x a M N 8

A --02.11A 50.051.02A 08.050.1b 91.003.0c 90.002.0D 0

9.201.3E C

I S A B 04.61E 0

3.40

5.4e C

I S A B 56.0L 54.057.0α°0°8a

a a --0

1.0

LVCMOS/LVTTL C LOCK G ENERATOR

T ABLE 9. O RDERING I NFORMATION

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.The aforementioned trademarks, HiPerClockS? and FemtoClocks? are a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.r e b m u N r e d r O /t r a P g n i k r a M e g a k c a P g

n i g a k c a P g n i p p i h S e r u t a r e p m e T G A 150048S C I A 1500P O S S T d a e L 8e b u t C °07o t C °0T G A 150048S C I A 1500P O S S T d a e L 8l

e e r &e p a t 0052C °07o t C °0F L G A 150048S C I L A 150P O S S T "e e r F -d a e L "d a e L 8e b u t C °07o t C °0T

F L

G A 150048S C I L

A 150P

O S S T "e e r F -d a e L "d a e L 8l

e e r &e p a t 0052C

°07o t C °0

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