V-Tec AT16/C5 Spezifikationen Seite 79
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Si2400
Rev. 1.3 79
DC Termination
The Si2400 has four programmable dc termination
modes which are selected with SF5[3:2] (DCT).
FCC mode (DCT = 10
b
), shown in Figure 14, is the
default dc termination mode and supports a transmit full
scale level of –1 dBm at TIP and RING. This mode
meets FCC requirements in addition to the requirements
of many other countries.
Figure 14. FCC Mode I/V Characteristics
CTR21 mode DCT = 11
b
, shown in Figure 15, provides
current limiting while maintaining a transmit full scale
level of –1 dBm at TIP and RING. In this mode, the dc
termination will current limit before reaching 60 mA.
Figure 15. CTR21 Mode I/V Characteristics
Japan mode DCT = 01
b
, shown in Figure 16, is a lower
voltage mode and supports a transmit full scale level of
–2.71 dBm. Higher transmit levels for DTMF dialing are
also supported. See "DTMF Dialing" on page 80. The
low voltage requirement is dictated by countries such as
Japan and Malaysia.
Figure 16. Japan Mode I/V Characteristics
Low Voltage mode (DCT = 00
b
), shown in Figure 17, is
the lowest line voltage mode supported on the Si2400,
with a transmit full scale level of –5 dBm. Higher
transmit levels for DTMF dialing are also supported.
See “DTMF Dialing”. This low voltage mode is offered
for situations that require very low line voltage
operation. It is important to note that this mode should
only be used when necessary, as the dynamic range will
be significantly reduced and thus the ISOmodem will
not be able to transmit or receive large signals without
clipping them.
Figure 17. Low Voltage Mode I/V
Characteristics
12
11
10
9
8
7
6
.01 .02 .03 .04 .05 .06 .07 .08 .09 .1 .11
Loop Current (A)
FCC DCT Mode
Voltage Across DAA (V)
45
40
35
30
25
20
15
10
5
.015 .02 .025 .03 .035 .04 .045 .05 .055 .06
Loop Current (A)
CTR21 DCT Mode
Voltage Across DAA (V)
10.5
10
9.5
9
8.5
8
7.5
7
6.5
6
5.5
.01 .02 .03 .04 .05 .06 .07 .08 .09 .1 .11
Loop Current (A)
Japan DCT Mode
Voltage Across DAA (V)
10.5
10
9.5
9
8.5
8
7.5
7
6.5
6
5.5
.01 .02 .03 .04 .05 .06 .07 .08 .09 .1 .11
Loop Current (A)
Low Voltage Mode
Voltage Across DAA (V)
- Features 1
- Applications 1
- Description 1
- Functional Block Diagram 1
- 2 Rev. 1.3 2
- TABLE OF CONTENTS 3
- 1. Electrical Specifications 4
- Table 2. Loop Characteristics 5
- Table 3. DC Characteristics 6
- Table 4. DC Characteristics 6
- Table 5. AC Characteristics 7
- for K-Grade, T 8
- –40 to 85°C for B-Grade) 8
- = –40 to 85°C for B-Grade) 9
- 10 Rev. 1.3 10
- 3. Bill of Materials 11
- 12 Rev. 1.3 12
- 4. Analog Input/Output 13
- 5. Functional Description 14
- 5.1. Digital Interface 15
- 16 Rev. 1.3 16
- 5.3. Low Power Modes 17
- 5.4. Global DAA Operation 17
- 18 Rev. 1.3 18
- Rev. 1.3 19 19
- 20 Rev. 1.3 20
- 5.6. Loop Current Detection 21
- 5.7. Carrier Detect/Loss 21
- 5.8. Overcurrent Detection 21
- 5.11. PCM Data Mode 23
- Figure 10. Signal Routing 24
- 5.12. Analog Codec 25
- 5.14. V.42 HDLC Mode 26
- 5.15. Fast Connect 27
- Table 16. MCKR Configurations 28
- 6.1. Command Line Execution 29
- 30 Rev. 1.3 30
- 6.4. S-Register Control 31
- 32 Rev. 1.3 32
- 6.5.4. A1 34
- 6.5.5. !2 34
- 6.5.6. !7 34
- Table 19. !7 Parameters 35
- Figure 12. !7 Security Timing 36
- Progress 37
- S19 S1A S1B S16 S17 S18 38
- Table 23. DTMF 39
- 7.1. DSP Registers 40
- SE8 SE6 SE5 41
- DSP Reg. Addr 41
- 7.2. Call Progress Filters 42
- 8. S Registers 43
- 44 Rev. 1.3 44
- Rev. 1.3 45 45
- 46 Rev. 1.3 46
- Rev. 1.3 47 47
- 50 Rev. 1.3 50
- Rev. 1.3 51 51
- 52 Rev. 1.3 52
- Rev. 1.3 53 53
- 54 Rev. 1.3 54
- Rev. 1.3 55 55
- 56 Rev. 1.3 56
- 58 Rev. 1.3 58
- Kissoff Tone Detect Length) 58
- Rev. 1.3 59 59
- 60 Rev. 1.3 60
- Rev. 1.3 61 61
- 62 Rev. 1.3 62
- Rev. 1.3 63 63
- Rev. 1.3 65 65
- 66 Rev. 1.3 66
- Rev. 1.3 69 69
- 70 Rev. 1.3 70
- Rev. 1.3 71 71
- 72 Rev. 1.3 72
- Rev. 1.3 73 73
- 74 Rev. 1.3 74
- Rev. 1.3 75 75
- 76 Rev. 1.3 76
- Rev. 1.3 77 77
- DAA Isolation Barrier 78
- Emissions/Immunity 78
- DC Termination 79
- AC Termination 80
- Ringer Impedance 80
- DTMF Dialing 80
- Pulse Dialing 80
- Billing Tone Detection 80
- Symbol Value 81
- In-Circuit Testing 82
- Compliance Test Commands 83
- Introduction 84
- APPENDIX C—UL1950 3RD EDITION 85
- 9. Pin Descriptions: Si2400 86
- Rev. 1.3 87 87
- 10. Pin Descriptions: Si3015 88
- Receive Input 89
- Filter 2 89
- Pin # Pin Name Description 89
- 11. Ordering Guide 90
- Millimeters 91
- Revision 1.1 to Revision 1.2 92
- Revision 1.2 to Revision 1.3 92
- Rev. 1.3 93 93
- CONTACT INFORMATION 94
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