Cirrus Logic CS61884 - Manual (Page 55)

CS61884
DS485F3 55
19.3 Digital Characteristics
(TA = -40
°C to 85°C; TV+, RV+ = 3.3 V ±5%; GND = 0 V)
19.4 Transmitter Analog Characteristics
(TA = -40 °C to 85°C; TV+, RV+ = 3.3 V ±5%; GND = 0 V)
Parameter Symbol Min. Typ Max Units
High-Level Input Voltage Note 6 V
IH
2.0 - - V
Low-Level Input Voltage Note 6 V
IL
- - 0.8 V
LOOP[7:0] Low-Level Input Voltage V
IHL
- - 1/3 VCCIO-0.2 V
LOOP[7:0] Mid-Level Input Voltage V
IHM
1/3 VCCIO +0.2 1/2 VCCIO 2/3 VCCIO-0.2 V
LOOP[7:0] High-Level Input Voltage V
IHH
2/3 VCCIO +0.2 - - V
High-Level Output Voltage Notes 6 , 7
I
OUT
= -400
μA
V
OH
2.4 - - V
Low-Level Output Voltage Notes 6 , 7
I
OUT
= 1.6 mA
V
OL
- - 0.4 V
Input Leakage Current -10 - +10 μA
Input leakage for LOOP pins -150 - +150
μA
Parameter Min. Typ Max Units
Output Pulse Amplitudes E1 75 Ω
Notes 8 , 9 , 10 E1 120
Ω
T1/J1
100Ω
2.14
2.7
2.4
2.37
3.0
3.0
2.6
3.3
3.6 V
V
V
Ratio of Positive to Negative pulses T1/J1 100
Ω
Notes 8 , 9 , 10 E1, amplitude at center of pulse interval
E1, width at 50% of nominal amplitude
0.95
0.95
0.95 -
-
- 1.05
1.05
1.05
Pulse Amplitude of a space T1/J1 100
Ω
E1 120
Ω
E1 75 Ω
-0.15
-0.3
-0.237
-
-
- 0.15
0.3
0.237
V
V
V
Power in 2 kHz band about 772 kHz
Notes
11 , 12 (T1/J1 100 Ω only) 12.6 - - dBm
Power in 2 kHz band about 1.544 MHz Notes 11 , 12
(referenced to power in 2 kHz band at 772 kHz, T1/J1 100 Ω only) -29 - - dBm
Transmit Return Loss - E1 51 kHz to 102 kHz
102 kH to 2048 kHz
Notes 11 , 12 , 13 2048 kHz to 3072 kHz
- 14
- 14
- 14 - 20
- 19
- 18 -
-
- dB
Transmit Return Loss - T1/J1 51 kHz to 102 kHz
102 kHz to 2048 kHz
Notes 11 , 12 , 13 2048 kHz to 3072 kHz
- 14
- 14
- 14 - 19
- 19
- 18 -
-
- dB
Jitter Added by the Transmitter 10 Hz - 8 kHz
8 kHz - 40 kHz
Notes 11 , 14 10 Hz - 40 kHz
Broad Band
-
-
-
- 0.010
0.009
0.007
0.015 0.020
0.025
0.025
0.050 UI
Transmitter Short Circuit Current per channel - - 50 mA RMS