Altec AL2094S Series, Руководство дизайнера

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AL2094S Designers Guide
Doc. No. DG_2094A Altec Electronic AG Seite 4 / 30
3.1.1 Phone Line Interface...................................................................................15
3.1.2 Call Progress Speaker Interface .................................................................15
3.1.3 Serial DTE Interface and Indicator Outputs ................................................15
3.1.4 External Reset Input ...................................................................................15
3.1.5 AL2094S Modem Pin Assignments and Signal Definitions ................................15
3.3 Electrical and Environmental Specifications...............................................................19
3.3.1 Operating Conditions, Maximum Ratings, Power Requirements........................19
3.3.2 Interface and Timing Waveforms............................................................................20
3.3.2.1 Serial DTE Interface................................................................................20
3.4 DAA Interface .............................................................................................................21
4. DESIGN CONSIDERATIONS ....................................................................................23
4.1 PC Board Layout Guidelines ......................................................................................23
4.1.1 General...................................................................................................................23
4.1.2 Electromagnetic Interference (EMI) Considerations ...............................................24
4.2 Other Considerations..................................................................................................24
4.3 Manufacturing Considerations....................................................................................25
5. PACKAGE DIMENSIONS ..........................................................................................26
6. SOCKET MODEM APPROVALS ...............................................................................27
6.1 Considerations for Telecom Approvals.......................................................................27
6.1.1 PSTN Connection...................................................................................................27
6.2 Considerations for Electrical Safety............................................................................27
6.2.1 Conditions for Maintaining Safety Compliance (European Countries)....................27
6.2.2 Power Supply [EN60950-1:2001, 1.6] ....................................................................28
6.2.3 Clearances, Creepage Distances and Distances through Insulation [EN60950-
1:2001, 2.10.3 and 2.10.4] ................................................................................................28
6.3 Considerations for EMC .............................................................................................30
6.3.2 Installation in Host Systems (European Countries) ...............................................30
List of Figures
F
IGURE
3-1. AL2094S M
ODEM
H
ARDWARE
S
IGNALS
................................................................16
F
IGURE
3-5. W
AVEFORMS
- S
ERIAL
DTE I
NTERFACE
................................................................20
F
IGURE
3-3. R
ECOMMENDED
T
ELEPHONE
L
INE
I
NTERFACE FOR
U.S. S
OCKET
M
ODEM
..............21
F
IGURE
3-4. R
ECOMMENDED
T
ELEPHONE
L
INE
I
NTERFACE FOR
W
ORLD CLASS SOCKET MODEM
.22
F
IGURE
5-1. AL2094S S
OCKET
M
ODEM
P
HYSICAL
D
IMENSIONS
...............................................26
List of Tables
Table 2-1. +MS Command Automode Connectivity ...............................................................10
Table 3-1. AL2094S Modem DIL-40 Pin Signals....................................................................16
Table 3-2. Signal Descriptions ...............................................................................................17
Table 3-3. Signal Descriptions (Cont'd)..................................................................................18
Table 3-4. AL2094S Modem I/O Type Definitions..................................................................18
Table 3-5. AL2094S Modem DC Electrical Characteristics....................................................18
Table 3-9. Operating Conditions ............................................................................................19
Table 3-10. Absolute Maximum Ratings ................................................................................19
Table 3-11. Current and Power Requirements.......................................................................19
Table 3-7. DAA Part List.........................................................................................................22