ACS8946 datasheet(11/40 Pages) SEMTECH

Part #	ACS8946

Description	Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for OC-12/STM-4 and GbE

Download	40 Pages

Scroll/Zoom	100%

Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

Logo

11 / 40 page

ADVANCED COMMUNICATIONS

FINAL

DATASHEET

Revision 3/November 2006 © Semtech Corp.

Page 11

www.semtech.com

ACS8946 JAM PLL

Characteristic is defined solely by the loop filter

bandwidth and is shown in Figure 5, which shows the

transfer characteristic using the recommended loop filter

bandwidth of 2 kHz with a damping factor of 1.2.

Figure 5 Jitter Transfer Characteristic, ACS8946

Stand-alone

In the combined solution, the ACS8525 device provides

additional low frequency jitter filtering. The Jitter Transfer

Characteristic of the combined ACS8946 and ACS8525 is

shown in Figure 6.

Figure 6 Jitter Transfer Characteristic, ACS8525 and

ACS8946 combined

Phase Noise Performance

The inherent jitter generation by the ACS8946 is shown in

the phase noise plot in Figure 7 measured on a

155.52 MHz output clock using an input reference of

19.44 MHz.

Figure 7 Phase Noise Offset from Carrier of ACS8946

622.08 MHz output clock

In the combined line card solution, the inherent jitter

generated by the ACS8525 is attenuated by the ACS8946

as shown in the phase noise plot in Figure 8.

Figure 8 Phase Noise Offset from Carrier, ACS8525

155.52 MHz output clock, with and without ACS8946

Clock Cleaner

Lock Detector

A simple lock detector is incorporated which combines the

plus and minus phase errors from the phase detector,

TBIL

ACS8944 RMS Jitter Transfer Curve

-27.0

-24.0

-21.0

-18.0

-15.0

-12.0

-9.0

-6.0

-3.0

0.0

3.0

100

1000

10000

100000

Frequency (Hz)

ACS8946 RMS Jitter Transfer Curve

TBIL

-160

-140

-120

-100

-80

-60

-40

-20

0

1.0E+02

1.0E+03

1.0E+04

1.0E+05

1.0E+06

1.0E+07

Frequency (Hz)

Typical Phase Noise @ 155.52MHz

TBIL

Typical Phase Noise Cleaning of ACS8525

-170

-150

-130

-110

-90

-70

-50

-30

-10

1.0E+02

1.0E+03

1.0E+04

1.0E+05

1.0E+06

1.0E+07

1.0E+08

Frequency (Hz)

ACS8525 alone

ACS8525 + ACS8946

Similar Part No. - ACS8946

Manufacturer	Part #	Datasheet	Description
Semtech Corporation	ACS8944	472Kb / 24P	Jitter Attenuating, Multiplying Phase Locked Loop for OC-12/STM-4
	ACS8944EVB	472Kb / 24P	Jitter Attenuating, Multiplying Phase Locked Loop for OC-12/STM-4
	ACS8944T	472Kb / 24P	Jitter Attenuating, Multiplying Phase Locked Loop for OC-12/STM-4
	ACS8947T	1Mb / 30P	Jitter Attenuating, Multiplying Phase-Locked Loop with Automatic Input Switch and Data Resynchronization Path

More results

Similar Description - ACS8946

Manufacturer	Part #	Datasheet	Description
Semtech Corporation	ACS8944	472Kb / 24P	Jitter Attenuating, Multiplying Phase Locked Loop for OC-12/STM-4
Semtech Corporation	ACS8947T	1Mb / 30P	Jitter Attenuating, Multiplying Phase-Locked Loop with Automatic Input Switch and Data Resynchronization Path
Renesas Technology Corp	894D115I-01	423Kb / 17P	OC-12/STM-4 and OC-3/STM-1 Clock/Data Recovery Device Rev C 2/19/15
Renesas Technology Corp	894D115I-04	441Kb / 16P	OC-12/STM-4 AND OC-3/STM-1 Clock/Data Recovery Device January 27, 2016
OPLINK Communications I...	SRC12-0403	621Kb / 4P	OC-12/STM-4 Receiver with Clock Recovery
NXP Semiconductors	74HC4046A	467Kb / 34P	Phase-locked-loop with VCO 1997 Nov 25
NXP Semiconductors	HEF4046B	416Kb / 15P	Phase-locked loop January 1995
Z-Communications, Inc	PSA4230C-LF	93Kb / 2P	PHASE LOCKED LOOP
	PSN1100A	74Kb / 2P	PHASE LOCKED LOOP
	PSA3005A	75Kb / 2P	PHASE LOCKED LOOP

More results

ACS8946 Datasheet(PDF) 11 Page - Semtech Corporation

ACS8946 Datasheet(HTML) 11 Page - Semtech Corporation

Similar Part No. - ACS8946

Similar Description - ACS8946

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Datasheet Download

Link URL