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
--0.8V
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
--0.4V
Input Leakage Current -10 - +10 μA
Input leakage for LOOP pins -150 - +150 μA
Parameter Min. Typ Max Units
Output Pulse Amplitudes E1 75Ω
Notes 8, 9, 10 E1 120Ω
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
