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PSB4596

Analog Line Interface Solution ALIS

Siemens AG 

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Overview

PSB 4595 / PSB 4596

Analog Line Interface Solution

Overview

The PSB 4595 and PSB 4596 two-chip solution forms the complete front end of a modem

or fax machine. This Analog Line Interface Solution (ALIS) consists of a DAA, a codec

and a hybrid circuit, and bridges the gap between the phone line and the data pump. The

analog PSB 4595 is manufactured in low-power BiCMOS technology and the digital PSB

4596 in CMOS technology. The ALIS concept is a fully programmable modem front end

which allows a single design for the worldwide market:

• Adaptation to specific countries and applications is achieved by downloading

appropriate coefficient sets.

• Isolation is achieved by a digital capacitor interface, without a transformer; making the

ALIS particularly suitable for designing PCMCIA modems.

• Thanks to an advanced digital-filter concept in combination with the programmable

electronic DAA, ALIS provides both excellent transmission performance and high

adaptability. This second-generation digital filter concept also allows maximum

autonomy between the various filter blocks. This performance makes ALIS suitable for

V.34+ and V.90 modem applications.

A minimum number of external components is required to complete the functional range

of ALIS. Its internal precision is based on a very accurate band-gap reference. The

frequency behavior is determined largely by digital filters which exhibit no fluctuations.

As a result of the ADC and DAC concepts, its linearity is limited only by second-order

parasitic effects.

The ALIS chip set can be easily adapted and connected to various modem data pumps

or to host-based modem solutions. The flexible digital interface of ALIS allows easy

programming via the modem data pump or a controller.

Siemens offers a range of reference and evaluation tools for the ALIS chip set. For

appropriate tools, please contact your nearest Siemens representative.

Semiconductor Group

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Data Sheet 06.98

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