ADVANCED COMMUNICATIONS

FINAL

DATASHEET

Revision 3/November 2006 © Semtech Corp.

Page 33

www.semtech.com

ACS8946 JAM PLL

Notes: (i) Measured on the ACS8946 Evaluation Board using output clock OUT1, with a 0 dBm reference clock from an ESG E4400B signal

(ii) “*” Derived values using the normal Gaussian crest value ratio of 10.

(iii) PLL Closed Loop bandwidth set to 2 KHz with a damping factor of 1.2.

(iv) All measurement results are derived from the phase noise plots using integration ranges defined by the telecommunication

standards' specifications.

Table 28 Output Jitter Generation: ACS8946 Stand-alone @19.44 MHz Input/155.52 MHz Output

Test Definition

Measured Results

Specification

Interface

Frequency

Spec Limit

Typical

Max

Units

G.813

Option 1[4],

and ETSI

EN 300 462 -

7 - 1[1]

STM-1 (optical)

155 MHz

65 kHz to

1.3 MHz

0.1 UI p-p = 643 ps

*

6.6

16.0

ps p-p

-0.7

1.6

ps rms

500 Hz to

1.3 MHz

0.5 UI p-p = 3215 ps

*

137.1

376.0

ps p-p

-13.7

37.6

ps rms

STM-4 622 MHz 250 kHz to

5MHz

0.1 UI p-p = 161 ps

*

3.4

5.6

ps p-p

-0.3

0.6

ps rms

1 kHz to 5 MHz

0.5 UI p-p = 804 ps

*

117.5

303.5

ps p-p

-11.7

30.3

ps rms

STM-16 2.5 GHz 1 MHz to

20 MHz

0.1 UI p-p = 40 ps

*

3.7

6.2

ps p-p

-0.4

0.6

ps rms

5 kHz to 20 MHz 0.5 UI p-p = 201 ps

*

55.9

149.6

ps p-p

-

5.6

15.0

ps rms

ETSI

EN 300 462 -

7 - 1[1]

STM-1

(electrical)

155 MHz

65 kHz to

1.3 MHz

0.075 UI p-p = 482 ps

*

6.6

16.0

ps p-p

-0.7

1.6

ps rms

G.813

Option 2[4]

STM-1 155 MHz 12 kHz to

1.3 MHz

0.1 UI p-p = 643 ps

*

27.8

80.6

ps p-p

-2.8

8.1

ps rms

STM-4 622 MHz 12 kHz to 5 MHz 0.1 UI p-p = 161 ps

*

27.9

73.3

ps p-p

-2.8

7.3

ps rms

STM-16 2.5 GHz 12 kHz to

20 MHz

0.1 UI p-p = 40 ps

*

28.0

73.6

ps p-p

2.8

7.4

ps rms

GR-253-

CORE[8]

OC-3/STS-3

155 MHz

12 kHz to

1.3 MHz

0.1 UI p-p = 643 ps

*

27.8

80.6

ps p-p

0.01 UI rms = 64.3 ps

2.8

8.1

ps rms

OC-12/STS-12

622 MHz

12 kHz to 5 MHz 0.1 UI p-p = 161 ps

*

27.9

73.3

ps p-p

0.01 UI p-p = 16.1 ps

2.8

7.3

ps rms

OC-48/STS-48

2.5 GHz

5 kHz to 20 MHz 1.5 UI p-p = 600 ps

*

55.9

149.6

ps p-p

-

5.6

15.0

ps rms

1 MHz to

20 MHz

0.15 UI p-p = 60 ps

*

3.7

6.2

ps p-p

-0.4

0.6

ps rms