Cirrus Logic CS61880 - Manual (Page 56)

CS61880
56 DS450PP3
19.6 Jitter Attenuator Characteristics
(TA = -40
°
C to 85
°
C; TV+, RV+ = 3.3 V
±
5%; GND = 0 V)
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.
Parameter Min. Typ Max Units
Jitter Attenuator Corner Frequency
Note
10 , 18
(Depends on JACF Bit in host mode)
-
- 1.25
2.50 -
- Hz
E1 Jitter Attenuation 3 Hz to 40 Hz
Note 10 , 17 400 Hz to 100 kHz
+ 0.5
-19.5 -
- -
- dB
Attenuator Input Jitter Tolerance before FIFO 32-bit FIFO
over flow and under flow Note
10 64-bit FIFO
-
- 24
56 -
- UI
UI
Delay through Jitter Attenuator Only 32-bit FIFO
Note 10 64-bit FIFO
-
- 16
32 -
- UI
UI
Intrinsic Jitter in Remote Loopback Notes 10 , 16 - - 0.11 UI
1 10 100 1K 10K
0
A
tt
e
nua
ti
on i
n
dB
Frequency in Hz
+ 0.5
2 57 1.4K 20 400 40
+ 10
- 10
- 20
- 30
- 50
- 40
- 60
- 19.5
- 6
- 70
100K
ITU G.736
TYP. E1 @ 1.25 Hz CF
TYP. E1 @ 2.5 Hz CF
Figure 18. Jitter Transfer Characteristic vs. G.736 & TBR 12/13