SI2400-KS Silicon Laboratories Inc, SI2400-KS Datasheet - Page 79

• Manufacturer Part Number: SI2400-KS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Type: Integrated Global DAAr

Specifications of SI2400-KS

• Package / Case: 16-SOIC (3.9mm Width)
• Data Format: V.21, V.22, V.23, Bell 103, Bell 212A
• Baud Rates: 2.4k
• Interface: UART
• Voltage - Supply: 3 V ~ 5.25 V
• Mounting Type: Surface Mount
• Product: Modem Chip
• Supply Voltage (min): 3 V
• Supply Current: 21 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 336-1166 - BOARD EVAL FOR SI2400 ISOMODEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 336-1093

DC Termination
The Si2400 has four programmable dc termination
modes which are selected with SF5[3:2] (DCT).
FCC mode (DCT = 10
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.
CTR21 mode DCT = 11
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
Figure 14. FCC Mode I/V Characteristics
20
45
40
35
30
25
15
10
5
12
11
10
.015 .02 .025 .03 .035 .04 .045 .05 .055 .06
8
9
7
6
.01 .02 .03 .04 .05 .06 .07 .08 .09 .1 .11
CTR21 DCT M ode
Loop Current (A )
Loop Current (A )
b
FCC DCT M ode
b
), shown in Figure 14, is the
, shown in Figure 15, provides
Rev. 1.3
Japan mode DCT = 01
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.
Low Voltage mode (DCT = 00
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 16. Japan Mode I/V Characteristics
10.5
10.5
9.5
8.5
7.5
6.5
5.5
9.5
8.5
7.5
6.5
5.5
10
10
Figure 17. Low Voltage Mode I/V
8
8
9
7
6
9
7
6
.01 .02 .03 .04 .05 .06 .07 .08 .09 .1 .11
.01 .02 .03 .04 .05 .06 .07 .08 .09 .1 .11
Characteristics
Low V oltage M ode
b
Japan DCT M ode
Loop Current (A )
Loop Current (A )
, shown in Figure 16, is a lower
b
), shown in Figure 17, is
Si2400
79