PSB4595

The PSB4595 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 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. PSB4595's 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 PSB4595 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 PSB4595. For appropriate tools, please contact your nearest Siemens representative.