Specifications

AN93
Rev. 0.9 7
2. Hardware Design Reference
The Si2493/57/34/15/04 chipset family consists of a 24-
pin TSSOP or a 16-pin SOIC 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 (parallel, PCM, and EEProm
interfaces are only available on the 24-pin TSSOP
package option)
. 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 "3.
Software Design Reference" on page 21.
2.1. Modulations and Protocols
Tables 1 through 3 list the modulations, protocols,
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.