Cirrus-logic CS61884 Instrukcja Użytkownika Pobierz pdf (Strona 51)

CS61884

DS485F3 51

18. APPLICATIONS

Figure 17. Internal RX/TX Impedance Matching

RGND

+3.3V

RV+

T1 1:2

REF

CS61884

One Channel

TRING

TTIP

TRANSMIT

LINE

T2 1:2

RTIP

RRING

13.3k

GND

CBLSEL

TV+

VCCIO

+3.3V

TGND

GNDIO

100

Cable

120

Cable

+3.3V

0.1

RECEIVE

LINE

Note 2

Note 1

Notes:1) Required Capacitor between each TV+, RV+, VCCIO and TGND, RGND, GNDIO respec-

tively.

2) Common decoupling capacitor for all TVCC and TGND pins.

Component

T1/J1 100Ω

Twisted Pair

Cable

E1 75Ω

Coaxial

Cable

E1 120Ω

Twisted Pair

Cable

R1 (Ω) 15 15 15

R2 (Ω) 15 15 15

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 71 72

Features 1
Description 1
TABLE OF CONTENTS 2
LIST OF FIGURES 5
LIST OF TABLES 6
1. PINOUT - LQFP 7
2. PINOUT - LFBGA 8
3. PIN DESCRIPTIONS 9
3.1 Power Supplies 9
3.2 Control 10
3.3 Address Inputs/Loopbacks 14
3.4 Cable Select 15
3.6 Digital Rx/Tx Data I/O 16
3.7 Analog RX/TX Data I/O 19
3.9 Miscellaneous 21
3.8 JTAG Test Interface 21
4. OPERATION 22
5. POWER-UP 22
6. MASTER CLOCK 22
7. G.772 MONITORING 22
DS485F3 23 23
9. TRANSMITTER 24
9.1 Bipolar Mode 25
9.2 Unipolar Mode 25
9.3 RZ Mode 25
9.5 Transmit All Ones (TAOS) 25
26 DS485F3 26
10.3 RZ Output Mode 27
10.5 Loss-of-Signal (LOS) 27
11. JITTER ATTENUATOR 28
12. OPERATIONAL SUMMARY 29
12.1 Loopbacks 29
12.2 Analog Loopback 29
12.3 Digital Loopback 30
12.4 Remote Loopback 30
DS485F3 31 31
13. HOST MODE 32
13.1 SOFTWARE RESET 32
13.2 Serial Port Operation 32
13.3 Parallel Port Operation 33
13.4 Register Set 34
TAOS Enable Register (03h) 35
DFM Status Register (05h) 35
(Continued) 37
14.33 Status Registers 42
15. ARBITRARY WAVEFORM 43
GENERATOR 43
44 DS485F3 44
16. JTAG SUPPORT 45
16.1 TAP Controller 45
16.1.1 JTAG Reset 45
16.1.2 Test-Logic-Reset 45
16.1.3 Run-Test-Idle 45
46 DS485F3 46
18. APPLICATIONS 51
18.4 Line Protection 53
19.3 Digital Characteristics 55
58 DS485F3 58
RPOS/RNEG 60
CLKE = 1 60
CLKE = 0 60
DS485F3 63 63
64 DS485F3 64
66 DS485F3 66
DS485F3 67 67
DS485F3 69 69
21. LFBGA PACKAGE DIMENSIONS 70
144L LQFP PACKAGE DRAWING 71
23. ORDERING INFORMATION 72
25. REVISION HISTORY 72

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