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PSB4596V3.1

Analog Line Interface Solution ALIS V3

Siemens AG 

PSB 4595 / PSB 4596

Analog Line Interface Solution

Typical Applications

from the system to the on-chip coefficient RAM (CRAM, located in the DSP) to program

the filters.

Digital signals are then converted by oversampling converters to analog signals.

Oversampling converters ensure the required conversion accuracy. The converted

signals are applied to the capacitor interface which transfers them to the analog chip

PSB4595 and thus to the Tip/Ring wires in the telephone line. Since the capacitor

interface means there is no longer a transformer, it is now possible to achieve a very flat

frequency response over the entire voice band, even at low frequencies.The process is

reversed for incoming analog signals from the Tip/Ring wires.

4.2 The ALIS V3 Chip Set with Host-based Software Modem

The ALIS V3 chip set can also be used as a front end between V.34 and V.90 software

modem applications running on a host and the Tip/Ring wires in a telephone line.

PSB 4596

SDI

PSB 4595

Tip/Ring

Microcontroller with USB or PCI Interface

USB or PCI

Figure 5 Software Modem Application

The digital signals travel on the USB or PCI bus and then via a FIFO structure to an SDI

which carries signals to and from the digital chip PSB 4596. The digital signals are then

converted by oversampling converters, as above for a DSP-based modem, and on to the

Tip/Ring wires in the telephone line. The process is reversed for incoming analog signals

from the Tip/Ring wires.

Semiconductor Group

15

Product Overview 06.98

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