SI2493-C-FT Silicon Laboratories Inc, SI2493-C-FT Datasheet - Page 85

• Manufacturer Part Number: SI2493-C-FT
• Description: 56 KBPS, V.92 ISOMODEM SYSTEM-SIDE - LEAD-FREE TSSOP 0 TO 7
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FT

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3.28. U63 (DAAC2)
U63(DAAC2) is a bit-mapped register with bits 3:0 reserved and should be modified through a read-modify-write
operation.
Bits 15:8 (LCS) function as an 8-bit unsigned measure of off-hook loop current with a resolution of 1.1 mA/bit.
Bits 7:4 (ACT) set the ac termination the Si3010/Si3018/Si3019 presents to tip and ring. The ac impedance setting
is dictated by the certification requirements for the country in which the modem is used.
Bit
15:8
10
Bit
7:4
3:0
7
Name
Full 2
Full 1
Reserved Read returns 0011b.
Name
LCS
ACT
This bit is available on Si3019 Rev E and later only, and is reserved on all other revisions
and DAA chips. When enabled, allows +6 dBm max into 600 Ω and guarantees >+3.2 dBm
in all 16 ac terminations of the Si3019E and later revisions.
0 = Disable
1 = Enable.
0 = Disable
1 = Enable. +3.2 dBm maximum into 600 Ω.
Off-hook loop current (1.1 mA/bit).
AC Termination Select.
ACT AC Termination
0000
0011
0100
1111
Real 600 Ω
220 Ω + (820 Ω || 120 nF) and 220 Ω + (820 Ω || 115 nF)
370 Ω + (620 Ω || 310 nF)
Global complex impedance
Table 51. U63 Bit Map
Table 50. U62
Rev. 0.9
Function
Function
AN93
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