SI3201-KS Silicon Laboratories Inc, SI3201-KS Datasheet - Page 44

• Manufacturer Part Number: SI3201-KS
• Description: IC LINEFEED INTRFC SI321X 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3201-KS

• Package / Case: 16-SOIC (3.9mm Width) Exposed Pad, 16-eSOIC, 16-HSOIC
• Function: CODEC
• Interface: PCM, Serial, SPI
• Number Of Circuits: 1
• Voltage - Supply: 3.13 V ~ 5.25 V
• Current - Supply: 88mA
• Power (watts): 800mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Includes: BORSCHT Functions, Ring Trip Detection
• Product: SLIC
• Supply Voltage (min): 3.13 V
• Supply Current: 88 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si3210/Si3211
In addition, the user must select the sinusoidal ringing
waveform by writing TSWS = 0 (direct Register 34,
bit 0).
2.4.3. Trapezoidal Ringing
In addition to the sinusoidal ringing waveform, the
ProSLIC
illustrates a trapezoidal ringing waveform with offset
V
To configure the ProSLIC for trapezoidal ringing, the
user should follow the same basic procedure as in the
Sinusoidal Ringing section, but using the following
equations:
RCO is a value added or subtracted from the waveform
to ramp the signal up or down in a linear fashion. This
value is a function of rise time, period, and amplitude,
where rise time and period are related through the
following equation for the crest factor of a trapezoidal
waveform.
where T = ringing period, and CF = desired crest factor.
44
ROFF
Figure 22. Trapezoidal Ringing Waveform
RNGX
.
V
RCO
TIP-RING
V
supports
ROFF
=
=
RNGX
1
-- -
4
RNGY
0.99211

t
RCO
RISE
0.00789
-------------------- -
1.99211
=
t
=
RISE
trapezoidal
RNGY
Desired V
-----------------------------------

=
=
1
-- -
2

2

3
-- - T 1
4
-------------------------------- -
t
RISE
15

96 V
2 RNGX
Period
T=1/freq
2




15
=
=
–


0
32509
---------- -
CF
8000
PK
70
----- -
96
1


2
ringing.
8000
=



2
376
=
15

7EFDh
=
time
0177h
Figure 22
Rev. 1.45
For example, to generate a 71 V
signal, the equations are as follows:
For a crest factor of 1.3 and a period of 0.05 seconds
(20 Hz), the rise time requirement is 0.0153 seconds.
In addition, the user must select the trapezoidal ringing
waveform by writing TSWS = 1 in direct Register 34.
2.4.4. Ringing DC voltage Offset
A dc offset can be added to the ac ringing waveform by
defining
Register 19). The offset, V
signal when RVO is set to 1 (direct Register 34, bit 1).
The value of ROFF is calculated as follows:
2.4.5. Linefeed Considerations During Ringing
Care must be taken to keep the generated ringing signal
within the ringing voltage rails (GNDA and V
maintain proper biasing of the external bipolar
transistors. If the ringing signal nears the rails, a
distorted ringing signal and excessive power dissipation
in the external transistors results.
To prevent this invalid operation, set the V
(direct Register 74) to a value higher than the maximum
peak ringing voltage. The discussion below outlines the
considerations and equations that govern the selection
of the V
voltage.
First, the required amount of ringing overhead voltage,
V
current through the load, I
gain of Q5 and Q6, and a reasonable voltage required
to keep Q5 and Q6 out of saturation. For ringing signals
up to V
However, to determine V
equations below.
OVR
RNGY 20 Hz
I
LOAD , PK
, is calculated based on the maximum value of
RNGX 71 V
BATH

PK
the
RCO 20 Hz, 1.3 crest factor

=
= 87 V, V
setting for a particular desired peak ringing
=
------------------------------------- -
0.0153 8000
V
------------------ -
R
offset


2
AC , PK
ROFF
LOAD
PK
=

24235
1
-- -
2



=
+
OVR
--------------- -
20 Hz
71
----- -
96
=
voltage
OVR
I
OS
1
LOAD,PK
V
----------------- -
ROFF

= 7.5 V is a safe value.
=
ROFF
2
96
=
for a specific case, use the

15
396
V
8000
, is added to the ringing
=
AC , PK

=
24235
, the minimum current
in
2
018Ch
15
=
PK

200
ROFF

, 20 Hz ringing
----------------- -
6.9 k
N
=
REN
5EABh
=
BATH
C8h
+
(indirect
I
BAT
OS
value
) to