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參數(shù)資料
| 型號(hào)： | L9219A |
| 英文描述： | CAP CER 390PF 3.15KVDC R3 RAD |
| 中文描述： | 低成本線接口，具有反向電池和雙電流限制 |
| 文件頁(yè)數(shù)： | 2/30頁(yè) |
| 文件大小： | 397K |
| 代理商： | L9219A |
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2
Agere Systems Inc.
Data Sheet
November 2001
with Reverse Battery and Dual Current Limit
L9219A/G Low-Cost Line Interface
Features ......................................................................1
Description...................................................................1
Pin Information ............................................................4
Functional Description.................................................6
Absolute Maximum Ratings (at TA = 25
°
C)................7
Recommended Operating Conditions .........................7
Electrical Characteristics.............................................8
Ring Trip Requirements..........................................12
Test Configurations ...................................................13
Applications...............................................................15
dc Applications........................................................19
Battery Feed.........................................................19
Current Limit.........................................................19
Overhead Voltage ............................................... 19
Rate of Battery Reversal......................................20
Loop Range..........................................................20
Off-Hook Detection...............................................20
Ring Trip Detection ............................................. 21
Longitudinal Balance...............................................21
ac Design................................................................22
Codec Types........................................................22
ac Interface Network ............................................22
Receive Interface .................................................22
Example 1: Real Termination (First-
Generation Codec)...............................................23
Example 2: Complex Termination (First-
Generation Codec)...............................................25
Power Derating.......................................................27
Pin-for-Pin Compatibility with L9217/L9218............27
PCB Layout Information ............................................27
Outline Diagram.........................................................28
28-Pin PLCC...........................................................28
Ordering Information..................................................29
Figures
Page
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10. ac Gains..................................................14
Figure 11. Basic Loop Start Application
Circuit Using T7504-Type Codec............15
Figure 12. Basic Loop Start Application
Circuit Using T8536-Type Codec............17
Functional Diagram...................................3
28-Pin PLCC.............................................4
Ring Trip Circuits....................................12
L9219 Basic Test Circuit.........................13
Metallic PSRR.........................................13
Longitudinal PSRR .................................13
Longitudinal Balance ..............................14
RFI Rejection..........................................14
Longitudinal Impedance..........................14
Figure 13. Loop Current vs. Loop Voltage.............. 19
Figure 14. Off-Hook Detection Circuit..................... 20
Figure 15. Ring Trip Equivalent Circuit
and Equivalent Application .................... 21
Figure 16. ac Equivalent Circuit.............................. 23
Figure 17. Interface Circuit Using First-
Generation Codec (
±
5 V Battery) .......... 26
Figure 18. Interface Circuit Using First-
Generation Codec (5 V Only Codec)..... 26
Tables
Page
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Pin Descriptions ..................................... 4
Input State Coding .................................. 6
Supervision Coding ................................ 6
Power Supply .......................................... 8
2-Wire Port .............................................. 9
Analog Pin Characteristics .................... 10
ac Feed Characteristics ........................ 11
Logic Inputs and Outputs ...................... 12
Parts List for Loop Start Application
Circuit Using T7504-Type Codec ......... 16
200 W + 680 W || 0.1 mF First-
Generation Codec Design Parameters . 17
Parts List for Loop Start Application
Circuit Using T8536-Type Codec ......... 18
FB1/FB2 Values vs. Typical Ramp
Time ...................................................... 20
Table 10.
Table 11.
Table 12.
Table of Contents
Contents
Page
Figures
Page
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