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主要特征

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Technical Docs

数据资料 ISDN、铃流、电源评估板 Sep 01, 1997

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主要特征

  • +3V to +16.5V Operating Range
  • Tightly Regulated, -24V Output for Off-Hook Voice Communication
  • -70V Output Supports a Five-Ringer-Equivalent Load (VIN > 10.5V)
  • Compact Construction
  • Proven PC Board Design
  • Uses Off-the-Shelf Components
  • Up to 84% Efficiency
  • 5µA Shutdown Current
  • Fully Assembled and Tested

应用/用途

  • 电池供电应用
  • 数据通信
  • 高效DC-DC转换器
  • LCD偏置发生器

描述

The MAX774 ISDN ring-tone power-supply (IRG) evaluation kit (EV kit) provides the high voltages required for implementing a plain old telephone system (POTS) interface on ISDN modems and line cards. It is a fully assembled and tested board that provides a tightly regulated, -24V output for powering off-hook voice communication and a -70V output for on-hook, ring-tone generation.

The EV kit is designed for applications that implement the telephone interface using subscriber line interface circuit (SLIC) ICs, such as the AM79R79 from AMD and comparable products from Lucent, Harris, and other vendors. Its design feeds back the -24V output, achieving tight regulation for clean voice-signal transmission. An economical, off-the-shelf, surface-mount transformer reduces system cost and size. Compact design conserves board area. High efficiency and reduced quiescent current make this design the optimal solution for green PC and portable designs.

The MAX774 IRG EV kit can also be used to evaluate the MAX775/MAX776. It has a layout that allows modification for -48V output operation as well as adaptation for lower-voltage European applications.

简化框图

Technical Docs

数据资料 ISDN、铃流、电源评估板 Sep 01, 1997

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心