Specifications

AN93
Rev. 0.8 5
Hardware Design Reference
The Si2493/57/34/15/04 chipset family consists of a 24-
pin TSSOP low-voltage modem device (Si2493/57/34/
15/04) and a 16-pin SOIC line-side DAA device
(Si3018/10) connecting directly with the telephone local
loop (TIP and RING). This modem solution is a
complete hardware (controller-based) modem that
connects to a host processor through a serial or parallel
interface. Isolation is provided by Silicon Laboratories’
isolation capacitor technology, which uses high-voltage
capacitors instead of a transformer. This isolation
technology complies with global telecommunications
standards including FCC, CTR21, JATE, and all known
country-specific requirements. Country, EMI/EMC, and
safety test reports are available. Check with your Silicon
Laboratories salesperson or distributor for more details.
Additional features include programmable ac/dc
termination and ring impedance, on-hook and off-hook
intrusion detection, caller ID, loop voltage/loop current
monitoring, overcurrent detection, ring detection, and
the switch-hook function.
All required program and data memory is included in the
modem device. When the modem receives a software
or hardware reset, all register settings revert to the
default values stored in the on-chip program memory.
The host processor interacts with the modem controller
through AT commands used to change register settings
and control modem operation. Changing register
settings and controlling the modem is described in the
Software Design Reference.
Modulations and Protocols
Tables 1 through 3 list the modulations and protocols
and carriers and tones supported by the Si2493/57/34/
15/04 modem family. The Si2493 supports all
modulations and protocols from Bell 103 through V.92.
The Si2457 supports all modulations and protocols from
Bell 103 through V.90. The Si2434 supports all
modulations and protocols from Bell 103 through V.34.
The Si2415 supports all modulations and protocols from
Bell 103 through V.32bis. The Si2404 supports all
modulations and protocols from Bell 103 through
V.22bis.
Table 1. Modulations and Protocols
Specification Data Rate (bps) Modulation Si2493 Si2457 Si2434 Si2415 Si2404
V.92 48k, 40k, 32k, 24k PCM
D
V.90 56k, 54.6k, 53.3k, 52k,
50.6k, 49.3k, 48k, 46.6k,
45.3k, 44k, 42.6k, 41.3k,
40k, 38.6k, 37.3k, 36k,
34.6k, 33.3k, 32k, 30.6k,
29.3k, 28k
PCM
DD
V.34 33.6k, 31.2k, 28.8k, 26.4k,
24k, 21.6k, 19.2k, 16.8k,
14.4k, 12k, 9600, 7200,
4800, 2400
TCM
DDD
V.32bis 14.4k, 12k, 9600, 7200,
4800
TCM
DDDD
V.32 9600
9600, 4800
TCM
QAM
DDDD
V.29FC 9600 QAM
DDDDD*
V.23 1200 FSK
DDDDD
V.22bis 2400, 1200 QAM
DDDDD
V.22 1200 DPSK
DDDDD
Bell212A 1200 DPSK
DDDDD
V.21 300 FSK
DDDDD
Bell103 300 FSK
DDDDD
*Note: With Si3018 DAA only.