CS61884 datasheet(55/72 Pages) CIRRUS

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CS61884

DS485PP4

19.3 Digital Characteristics

(TA = -40

°Cto85°C; TV+, RV+ = 3.3 V ±5%; GND = 0 V)

19.4 Transmitter Analog Characteristics

(TA = -40

°Cto 85°C; TV+, RV+ = 3.3 V ±5%; GND = 0 V)

Parameter

Symbol

Min.

Typ

Max

Units

High-Level Input Voltage

Note 6

VIH

2.0

Low-Level Input Voltage

Note 6

VIL

0.8

LOOP[7:0] Low-Level Input Voltage

VIHL

1/3 VCCIO-0.2

LOOP[7:0] Mid-Level Input Voltage

VIHM

1/3 VCCIO +0.2 1/2 VCCIO 2/3 VCCIO-0.2

LOOP[7:0] High-Level Input Voltage

VIHH

2/3 VCCIO +0.2

High-Level Output Voltage

Notes 6, 7

IOUT =-400 µA

VOH

2.4

Low-Level Output Voltage

Notes 6, 7

IOUT =1.6 mA

VOL

0.4

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 100

Ω

2.14

2.7

2.4

2.37

3.0

2.6

3.3

3.6

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

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

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

-20

-19

-18

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

-19

-18

Jitter Added by the Transmitter

10 Hz - 8 kHz

8kHz -40kHz

Notes 11, 14

10 Hz - 40 kHz

Broad Band

0.010

0.009

0.007

0.015

0.020

0.025

0.050

Transmitter Short Circuit Current per channel

mA RMS

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