Abstract: Analog switches can be used to enable the transmission of digital signals and power over the same two wires. The signal waveform is rectified at the remote location to provide a stable supply voltage and modest load current (about 1mA maximum) for the receiver. This signaling system enables the transmission of digital signals and power over the same two wires (Figure 1). The signal waveform is rectified at the remote location to provide a stable supply voltage and modest load current (about 1mA maximum) for the receiver. Figure 1. This digital signaling system accepts single-ended data, transmits differential data, and produces a supply voltage for the receiver by full-wave rectifying the remote-end signal. For conventional single-ended data, a series of "0s" can allow excessive droop in the receiver's supply voltage. To avoid that problem differential data (±5V to ±18V) is transmitted, pseudo RS-485 style, from a single-ended logic-level input. The full-wave rectifier and differential drive ensures that a supply voltage is always present Current-limiting resistors at the supply inputs prevent damage in the event of a line short. Values of 1kΩ are optimum. Higher values produce excessive switching noise at the chip side of the resistors, caused by charge injection from the switches. Adequate decoupling of the supply rails also helps to minimize noise. With +5V and -5V supplies powering the MAX4526/4527 as shown in Figure 1, the measured output for various loads is as follows: Load (Ω) VSUPPLY(V) 1M 9.60 47k 9.00 10k 8.60 8.2k 8.40 5k 8.20 의견을 보내주세요! 위 내용이 도움이 되셨나요? 여러분의 의견을 기다립니다 — Maxim은 보내주신 정정이나 제안사항을 반영하고 있습니다. 이 페이지를 평가하고 의견을 보내주십시오. 자동 업데이트 관심있는 분야의 애플리케이션 노트가 나올 때 자동으로 업데이트 받고 싶으세요? 그렇다면 EE-Mail™을 신청하십시오. 추가 정보   APP 1863: Jan 31, 2003 MAX4526 위상 반전 아날로그 스위치 전체 데이터 시트 (PDF, 120kB) 무료 샘플 MAX4527 위상 반전 아날로그 스위치 전체 데이터 시트 (PDF, 120kB) 무료 샘플   다운로드, PDF 형식 (32kB)  AN1863, AN 1863, APP1863, Appnote1863, Appnote 1863