C2.5X6.3MM-RAD datasheet(25/38 Pages) SILABS

25 / 38 page

Preliminary Rev. 0.33

Si3226/7

Si3208/9

4. Functional Description

The Dual ProSLIC® chipset includes the Si3226/7 low-

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

characteristics

for

each

channel

are

independently configurable.

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.

Figure 11. Dual ProSLIC DC Feed

Characteristics

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 (VTIP–VRING),

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

Detection

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.

ILOOP (mA)

I_RFEED

VTR(V)

I_ILIM

I_VLIM

Resistive Region

Constant V Region

V_VLIM

V_RFEED

V_ILIM

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