SI2457-C-FS Silicon Laboratories Inc, SI2457-C-FS Datasheet - Page 50

• Manufacturer Part Number: SI2457-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-C-FS

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel, UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si2457/34/15/04
U63 DAAC3
Reset settings = 0x0003
U65 DAAC4
Reset settings = 0x00E0
50
*Note: Typically used only for board-level debug.
Name
Name
12:8
Type
Type
Bit
7:5
3:0
15
14
13
Bit
Bit
4
15:8
Bit
7:4
3:0
Reserved Read returns zero.
Reserved Read returns zero.
Reserved Must not change in a read-modify-write.
Reserved Must not change in a read-modify-write.
D15
D15
PWMG
Name
PDL*
PDN
Reserved Read returns 0x3.
ACT[3:0]
LCS[7:0]
PWMG PDN
D14
Name
D14
R/W
PWM Gain.
0 = No gain.
1 = 6 dB gain applied to AOUT.
Powerdown.
Completely powerdown the Si2457/34/15/04 and Si3018. Once set to 1, the Si2457/34/15/04
must be reset to power on.
0 = Normal.
1 = Powerdown.
Powerdown Line-Side Chip.
0 = Normal operation.
1 = Places the Si3018 in powerdown mode.
D13
D13
R/W
Off-Hook Loop Current (1.1 mA/bit).
AC Termination Select.
ACT[3:0]
D12
LCS[7:0]
D12
0000
0011
0100
1111
D11
D11
AC Termination
D10
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
D10
D9
D9
Rev. 1.1
D8
D8
Function
D7
D7
Function
D6
ACT[3:0]
D6
R/W
D5
D5
D4
PDL
R/W
D4
D3
D3
D2
D2
D1
D1
D0
D0