SI3203-B-FM Silicon Laboratories Inc, SI3203-B-FM Datasheet - Page 25

• Manufacturer Part Number: SI3203-B-FM
• Description: IC PROSLIC LINE FEED 100V 40QFN
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3203-B-FM

• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: No
• Longitudinal Balanced: 60
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Package Type: TQFP
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Function: Subscriber Line Interface Concept (SLIC)
• Interface: GCI, PCM, SPI
• Number Of Circuits: 4
• Voltage - Supply: 3.3V
• Current - Supply: *
• Power (watts): *
• Operating Temperature: *
• Mounting Type: Surface Mount
• Package / Case: 40-VFQFN Exposed Pad
• Includes: *
• Lead Free Status / RoHS Status: Compliant

4. Functional Description
The Dual ProSLIC
voltage IC and the Si3208/9 high-voltage linefeed IC.
The Dual ProSLIC provides all SLIC, codec, DTMF
detection, and signal generation functions needed for
two complete analog telephone interfaces. The Dual
ProSLIC performs all battery, over-voltage, ringing,
supervision, codec, hybrid, and test (BORSCHT)
functions; it also supports extensive metallic loop testing
capabilities.
The Si3226 provides a standard voice-band (200 Hz–
3.4 kHz) audio codec. The Si3227 provides an audio
CODEC with both wideband (50 Hz–7 kHz) and
standard voice-band (200 Hz– 3.4 kHz) modes. The
wideband mode provides an expanded audio band with
a 16 kHz sample rate for enhanced audio quality while
the standard voice-band mode provides standard
telephony audio compatibility. The Si3226/7 provides
two independent, programmable, dc-dc converter
controllers, each of which reacts to line conditions to
provide the optimal battery voltage required for each
line-state.
The linefeed chips (Si3208/9) provide programmable
on-hook voltage, programmable off-hook loop current,
reverse battery operation, loop or ground start
operation, and on-hook transmission. Loop current and
voltage are continuously monitored using an A/D
converter in the Si3226/7. The Si3208 supports battery
voltages up to 110 V, sufficient for most ringing signals.
The Si3209 supports battery voltages up to 130 V for
higher-voltage ringing applications.
The Dual ProSLIC supports balanced 5 REN ringing
with or without a programmable dc offset. The available
offset, frequency, waveshape, and cadence options are
designed to ring the widest variety of terminal devices
and to reduce external controller requirements.
A complete audio transmit and receive path is
integrated, including ac impedance and hybrid gain.
These features are software-programmable, allowing a
single hardware design to meet global requirements.
Digital voice data transfer occurs over a standard PCM
bus. Control data is transferred using a standard SPI.
The Si3226/7 is available in a 64-pin TQFP; the Si3208
is available in a 32-pin QFN, and the Si3209 is available
in a 40-pin QFN or a 48-pin eTQFP.
4.1. DC Feed Characteristics
Dual ProSLIC internal linefeed circuitry provides
completely programmable dc feed characteristics.
Linefeed
independently configurable.
characteristics
®
chipset includes the Si3226/7 low-
for
each
channel
Preliminary Rev. 0.33
are
When in the active state, each ProSLIC channel
operates in one of three dc linefeed operating regions: a
constant-voltage region, a constant-current region, or a
resistive region, as shown in Figure 11. The constant-
voltage region has a low resistance, typically 160 Ω.
The constant-current region approximates infinite
resistance.
4.2. Linefeed Operating States
The linefeed interface includes eight different register-
programmable operating states as listed in Table 16.
The Open state is the default condition in the absence
of any preloaded register settings. The device may also
automatically enter the open state in the event of a
linefeed fault condition.
4.3. Line Voltage and Current Monitoring
The Dual ProSLIC continuously monitors the TIP, RING,
and battery voltages and currents via an on-chip ADC
and stores the resulting values in individual register
addresses. Additionally, the loop voltage (V
loop current, and longitudinal current values are
calculated based on the TIP and RING measurements
and are stored in unique register locations for further
processing. The ADC updates all registers at a rate of
2 kHz or greater.
4.4. Power Monitoring and Power Fault
The Dual ProSLIC's line monitoring functions are used
to continuously protect the linefeed IC (LFIC) against
excessive power conditions. The LFIC contains an on-
chip, analog sensing diode that provides real-time
temperature data to the Si3226/7 and turns off the LFIC
when a preset threshold is exceeded. The LFIC status
is reflected in a Si3226/7 register bit.
V_RFEED
V_VLIM
Detection
V_ILIM
V
TR
Figure 11. Dual ProSLIC DC Feed
(V)
I_VLIM
Constant V Region
Characteristics
I_RFEED
Resistive Region
Si3208/9
I_ILIM
TIP
I
LOOP
–V
(mA)
RING
25
),