CS61880-IB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS61880-IB

Octal E1 Line Interface Unit

Cirrus Logic 

CS61880

19.6 Jitter Attenuator Characteristics

(TA = -40° C to 85° C; TV+, RV+ = 3.3 V ±5%; GND = 0 V)

Parameter

Jitter Attenuator Corner Frequency

Note 10, 18

(Depends on JACF Bit in host mode)

E1 Jitter Attenuation

Note 10, 17

Attenuator Input Jitter Tolerance before FIFO

over flow and under flow Note 10

Delay through Jitter Attenuator Only

Note 10

Intrinsic Jitter in Remote Loopback

Min.

Typ

Max

Units

-

1.25

-

Hz

-

2.50

-

3 Hz to 40 Hz + 0.5

-

400 Hz to 100 kHz -19.5

-

-

dB

-

32-bit FIFO

-

24

-

UI

64-bit FIFO -

56

-

UI

32-bit FIFO -

16

-

UI

64-bit FIFO -

32

-

UI

Notes 10, 16 -

-

0.11

UI

Notes: 17. Attenuation measured with sinusoidal input filter equal to 3/4 of measured jitter tolerance. Circuit

attenuates jitter at 20 dB/decade above the corner frequency. Output jitter can increase significantly

when more than 28 UI’s are input to the attenuator.

18. Measurement is not effected by the position of the Jitter Attenuator.

+ 10

+ 0.5

0

-6

- 10

- 19.5

- 20

- 30

ITU G.736

- 40

TYP. E1 @ 2.5 Hz CF

- 50

- 60

- 70

12

TYP. E1 @ 1.25 Hz CF

10 20 40 57 100

400 1K 1.4K

10K

Frequency in Hz

Figure 18. Jitter Transfer Characteristic vs. G.736 & TBR 12/13

56

100K

DS450PP2

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