LCR1210-R100F datasheet(35/59 Pages) SKYWORKS

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Si32260/1

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5.9. Polarity Reversal

The Si32260/1 supports polarity reversal for message

waiting and various other signaling modes. The ramp

rate can be programmed for a smooth or abrupt

transition

accommodate

different

application

requirements.

5.10. Two-Wire Impedance Synthesis

The ac two-wire impedance synthesis is generated on-

chip using a DSP-based scheme to optimally match the

output impedance of the Si32260/1 to the reference

impedance. Most real or complex two-wire impedances

can be generated by using the coefficient generator

software to simulate the desired line conditions and

generate the required register coefficients.

5.11. Transhybrid Balance Filter

The trans-hybrid balance function is implemented on-

chip using a DSP-based scheme to effectively cancel

the reflected receive path signal from the transmit path.

The coefficient generator software is used to optimize

the filter coefficients.

5.12. Tone Generators

The Si32260/1 includes two digital tone generators that

allow a wide variety of single- or dual-tone frequency

and amplitude combinations. Each tone generator has

its own set of registers that hold the desired frequency,

amplitude, and cadence to allow generation of DTMF

and call progress tones for different requirements. The

tones can be directed to either receive or transmit paths.

5.13. DTMF Detection

The Dual ProSLIC performs DTMF detection.

5.14. Pulse Metering

The pulse metering system for the Si32260/1Si32260/1

is designed to inject a 12 or 16 kHz billing tone into the

audio path with maximum amplitude of 0.5 VRMS at TIP

and RING into a 200

 ac load impedance. The tone is

generated in the DSP via a table lookup that guarantees

spectral purity by not allowing drift. The tone will ramp

up until it reaches a host-programmed threshold, at

which point it will maintain that level until instructed to

ramp down, thus creating a trapezoidal envelope.

See AN381 for additional details and considerations on

Pulse Metering.

5.15. DC-DC Controller

The Si3226x integrates two dc-dc controllers that can

be used to control external dc-dc converters to generate

high voltage supplies to the SLIC channels.

The integrated line feeds are designed to work with

either a single tracking high voltage input, one for each

channel, or with two high voltage supplies shared by

both channels.

In tracking mode, the VBATa and VBATb inputs are

each directly connected to the high voltage output of

two tracking dc-dc converters, one for channel A and

one for channel B. In tracking mode, the VBAT voltage

for each channel is optimized to minimize power

consumption by closely tracking the SLIC state, even

tracking the ringing waveforms (see section 2.1 for

schematics).

In shared supply mode, a single flyback dc-dc converter

generates two rails using two taps on the dc-dc

converter's transformer. External power offloading

transistors are used to lower the power dissipated inside

the Si3226x device by shunting excess power away. In

tracking shared supply (TSS) mode, in a two channel

implementation, the dc-dc converter is controlled by the

integrated dc-dc controller which allows the high voltage

and low voltage outputs from the dc-dc converter to

track the combined state of the two channels of the

Si3226x ProSLIC, including the ringing waveforms.

Using the same schematic, the TSS mode of operation

reduces system power consumption significantly when

compared to typical fixed rail shared supply designs

(see section 2.2 for schematics).

Both of the dc-dc controller outputs DCDRVa/b are

driven by an internal charge pump which allows them to

connect directly to the gate of the MOSFET switch of a

flyback (transformer based) dc-dc converter. This

connection eliminates the need for the MOSFET pre-

drive circuit that is required when VTH is greater than

VDD. See Table 7.

5.16. Wideband Audio

The Si32260/1 dual ProSLIC devices support a

software-selectable

wideband

(50 Hz–7 kHz)

and

narrowband

(200 Hz–3.4 kHz)

audio

codec. The

wideband mode provides an expanded audio band at a

16-bit, 16 kHz sample rate for enhanced audio quality

while

maintaining

standard

telephony

audio

compatibility. In wideband operation, two time slots are

used to transmit the wideband signal and each slot

contains 8-bits of the 16-bit sample. These two time

slots are transmitted and received half a frame apart,

but within the same 8 kHz frame.

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