Maxim 73M1922 MicroDAA数据接入PSTN调制解调器解决方案

Maxim公司的73M1822/73M1922是 低成本MicroDAA数据接入装置（DAA）,把调制解调器连接到公用电话交换网（PSTN），其中包括桥接电流环路电路、线路忙检测电路、摘机继电器、环路电流侦测电路和分机等.满足FCC,ETSI ES 203 021-2,JATE, NET4和其它PTT标准,线路电路多达8mA, 满刻度发送/接收为0dBm,THD为–80 dB,16位CODEC高达16kHz取样频率,基准时钟范围9-40 MHz,主要用在V.92调制解调器, 传真机/多功能外设(MFP),语音邮件系统,卫星机顶盒,POS终端以及工业和医疗信息处理系统.本文介绍了73M1822/73M1922主要特性, 简化的73M1x22 系统方框图, 73M1922和73M1822推荐应用电路图以及相应的材料清单, 3M1922 MicroDAA 20引脚TSSOP演示板电路图及其材料清单,PCB元件布局图.
The 73M1822 MicroDAA is the world’s first single-package silicon Data Access Arrangement (DAA) for data/fax modem and voice applications. It provides a serial Modem Analog Front End (MAFE) interface to popular DSP/host processors to implement a globally compliant low-cost soft modem solution.
The 73M1822 MicroDAA is available as a two-chip configuration (the 73M1922) that consists of a 73M1902 Host-Side Device and a 73M1912 Line-Side Device. The MicroDAA integrates all codec and DAA functions necessary to achieve reliable PSTN connection worldwide.
The MicroDAA uses a small pulse transformer, which can achieve more than 6 kV isolation. Power may be supplied along with data through this barrier interface to achieve superior performance in weak loop current conditions. Inherently immune to RFI and other forms of common mode interference, the patented MicroDAA technology achieves global DAA compliance with unparalleled flexibility, reliability, and cost structure and requires less than 2 square inches of a single sided PCB.
The MicroDAA supports Caller ID Type I and II, ring detection, tip/ring polarity reversal detection, hook switch control, pulse dialing, regulation of loop current (DC mask), configurable line impedance matching, line in use and parallel pickup detection.
The MicroDAA integrates billing tone filters, external clock refere...