5 receiver analog characteristics, Notes – Cirrus Logic CS61884 User Manual
Page 56
CS61884
56
DS485F3
19.5 Receiver Analog Characteristics
(TA = -40
°C to 85°C; TV+, RV+ = 3.3 V ±5%; GND = 0 V))
Notes: 11. Parameters guaranteed by design and characterization.
12. Using components on the CDB61884 evaluation board in Internal Match Impedance Mode.
13. Return loss = 20log10 ABS((Z1 + Z0) / (Z1 - Z0)) where Z1 - impedance of the transmitter or receiver,
and Z0 = cable impedance.
14. Assuming that jitter free clock is input to TCLK.
15. Jitter tolerance for 0 dB for T1/J1 input signal levels and 6 dB for E1 input signal levels. Jitter tolerance
increases at lower frequencies. HDB3/B8ZS coders enabled.
16. In Data Recovery Mode.
17. Jitter Attenuator in the receive path.
Parameter
Min.
Typ
Max
Units
Allowable Cable Attenuation @ 1024kHz and 772kHz
-
-
- 12
dB
RTIP/RRING Input Impedance
T1/J1 100
Ω Load
(Internal Line matching mode)
E1 120
Ω Load
75
Ω Load
-
-
-
140
14k
50
-
-
-
Ω
RTIP/RRING Input Impedance
T1/J1 100
Ω Load
(External Line matching mode)
E1 120
Ω Load
75
Ω Load
-
-
-
14K
14k
14K
-
-
-
Ω
Receiver Dynamic Range
0.5
-
-
Vp
Signal to Noise margin (Per G.703, O151 @ 6dB cable Atten). Note
-
- 18
-
dB
Receiver Squelch Level
-
150
-
mV
LOS Threshold
-
200
-
mV
LOS Hysteresis
-
50
-
mV
Data Decision Threshold
E1 Modes
41
50
59
% of
peak
Data Decision Threshold
T1/J1 Modes
56
65
74
% of
peak
Input Jitter Tolerance - E1
1 Hz - 1.8 Hz
20 Hz - 2.4 kHz
18 kHz - 100 kHz
18
1.5
0.2
-
-
-
-
-
-
UI
Input Jitter Tolerance - T1/J1
0.1 Hz - 1 Hz
4.9 Hz - 300 kHz
10kHz - 100 kHz
138
28
0.4
-
-
-
-
-
-
UI
Input Return Loss - E1/T1/J1
51 kHz - 102 kHz
102 kHz - 2048 kHz
2048 kHz - 3072 kHz
- 18
- 18
- 18
- 28
- 30
- 27
-
-
-
dB