SI3015-BS Silicon Laboratories Inc, SI3015-BS Datasheet - Page 27

• Manufacturer Part Number: SI3015-BS
• Description: IC ISOMODEM LINE-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Type: Enhanced Global Direct Access Arrangementr

Specifications of SI3015-BS

• Package / Case: 16-SOIC (3.9mm Width)
• Data Format: V.90
• Interface: Serial
• Voltage - Supply: 3.3 V ~ 5 V
• Mounting Type: Surface Mount
• Product: Modem Module
• Supply Current: 0.3 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
• Baud Rates: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Although the DAA will remain off-hook during a billing
tone event, the received data from the line will be
corrupted when a billing tone occurs. If the user wishes
to receive data through a billing tone, an external LC
filter must be added. A modem manufacturer can
provide this filter to users in the form of a dongle that
connects on the phone line before the DAA. This keeps
the manufacturer from having to include a costly LC filter
internal to the modem when it may only be necessary to
support a few countries.
Alternatively, when a billing tone is detected, the system
software may notify the user that a billing tone has
occurred. This notification can be used to prompt the
user to contact the telephone company and have the
billing tones disabled or to purchase an external LC filter.
Billing Tone Filter (Optional)
In order to operate without degradation during billing
tones in Germany, Switzerland, and South Africa, an
external LC notch filter is required. (The Si3038 can
remain off-hook during a billing tone event, but modem
data will be lost in the presence of large billing tone
signals.) The notch filter design requires two notches,
one at 12 KHz and one at 16 KHz. Because these
components are fairly expensive and few countries
supply billing tone support, this filter is typically placed
in an external dongle or added as a population option
for these countries. Figure 25 shows an example billing
tone filter.
L1 must carry the entire loop current. The series
resistance of the inductors is important to achieve a
narrow and deep notch. This design has more than
25 dB of attenuation at both 12 KHz and 16 KHz.
SDATA_OUT
SDATA_IN
BIT_CLK
SYNC
prev. fram e
prev. frame
s lot 12
slot 12
TAG
TAG
Power Down Fram e
Figure 24. AC-Link Power-Down/Up Sequence
W rite to
56th
MLNK
Data
Sleep State
Rev. 2.01
‘
The billing tone filter effects the ac termination and
return loss. The current complex ac termination will
pass worldwide return loss specifications both with and
without the billing tone filter by at least 3 dB. The ac
termination is optimized for frequency response and
hybrid cancellation, while having greater than 4 dB of
margin with or without the dongle for South Africa,
Australia, CTR21, and German and Swiss country-
specific specifications.
Table 20. Component Values—Optional Billing
RING
Symbol
From
C1,C2
Line
W ake Event
TIP
C3
L1
L2
Figure 25. Billing Tone Filter
3.3 mH, >120 mA, <10 Ω, ±10%
10 mH, >40 mA, <10 Ω, ±10%
Tone Filters
0.027 µF, 50 V, ±10%
0.01 µF, 250 V, ±10%
C1
C2
L1
TAG
TAG
New Audio Fram e
Value
C3
L2
Slot 1
Slot 1
Slot 2
Slot 2
Si3038
DAA
To
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