DS2155L+

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Introduction

The DS2155L+ is a single-chip, ultra-low power, low cost, V.22bis / V.22 / V.21 / Bell 212A compliant Data Access Arrangement (DAA) and Digital Subscriber Line (DSL) Line Interface Unit (LIU) chip. This article will give an overview of the application fields and working principle of the DS2155L+.

Application Field

The DS2155L+ integrates a DAA and LIU for connecting systems to line-powered, point-to-point telephone networks. Its electrical features and interfaces are compliant with standard international telecom specifications. It is specialized in ISDN, PSTN, USB and network modem applications such as optical fiber modems and cordless/wireless modems. This chip can be used in a variety of data communication applications, including analog and digital fax, authentication, and dial-up remote access control applications.

Working Principle

The DS2155L+ integrates various functions, such as an on-chip amplifier, hybrid transformer, line power detection, and loop current detect, into one chip. It efficiently senses incoming signals through an adjustable gain and impedance matching network, as well as a programmable phase-locked loop oscillator. Moreover, it has an on-chip digital signal processor (DSP) and an ARM7 microcontroller and provides a fast remote wake-up response that complements the low power and low cost requirements of the ISDN/ PSTN systems. The DSP also enables the chip to perform data communication applications with a maximum data rate of 56K bps. In addition, a dedicated power management circuit enables the chip to operate reliably in the low power (3.3V) and low noise conditions, thus allowing it to be used in a wide variety of applications.

Conclusion

To sum up, the DS2155L+ is an ultra-low power, low cost, V.22bis / V.22 / V.21 / Bell 212A compliant Data Access Arrangement (DAA) and Digital Subscriber Line (DSL) Line Interface Unit (LIU) chip that is suited for a range of data communication applications. It integrates various functions, such as an on-chip amplifier, hybrid transformer, line power detection, and loop current detect, into one chip, and it has an on-chip digital signal processor and an ARM7 microcontroller which provides a fast remote wake-up response. Moreover, it has a dedicated power management circuit which enables the chip to operate reliably in the low power and low noise conditions.

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