Transceiver IC Generates ±30V,
transceiver ic generates ±30v,产生±30v的收发器集成电路
abstract: this application note explains how an rs-232 transceiver and a few external components can be combined to generate supply rails up to ±30v. the max202 transceiver is featured in the design.
this design idea appeared in the july 20, 2006 issue of electronic design magazine.
when applications require only a few millamps of supply current, an rs-232 transceiver ic (here, the max202) and a few external components can generate bipolar supply rails up to ±30v. this capability is useful in ±15v op-amp circuits that provide, for example, meter drive, lcd bias, and gas-detector bias.
in the standard application for which it was designed, the internal charge pump of the max202 generates ±10v for driving an rs-232 line. in figure 1 the ic's transmit section drives an external charge pump that generates up to ±30v. modifications allow the circuit to generate other voltages, such as ±20v. with the addition of external linear regulators it can produce ±15v for bipolar op-amp circuits.
figure 1. this rs-232 transceiver drives an external charge pump, which provides ±30v supply voltages at a few milliamps.
the maximum operating frequency for the external charge pump is approximately 120khz, so a jk flip-flop (or other divide-by-2 circuit connected between +5v and ground) is inserted in the oscillator line to lower the frequency applied to the pump. lower voltages can be obtained (±20v, for example) by connecting the anode of d1 and the cathode of d2 to ground instead of ±10v.
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abstract: this application note explains how an rs-232 transceiver and a few external components can be combined to generate supply rails up to ±30v. the max202 transceiver is featured in the design.
this design idea appeared in the july 20, 2006 issue of electronic design magazine.
when applications require only a few millamps of supply current, an rs-232 transceiver ic (here, the max202) and a few external components can generate bipolar supply rails up to ±30v. this capability is useful in ±15v op-amp circuits that provide, for example, meter drive, lcd bias, and gas-detector bias.
in the standard application for which it was designed, the internal charge pump of the max202 generates ±10v for driving an rs-232 line. in figure 1 the ic's transmit section drives an external charge pump that generates up to ±30v. modifications allow the circuit to generate other voltages, such as ±20v. with the addition of external linear regulators it can produce ±15v for bipolar op-amp circuits.
figure 1. this rs-232 transceiver drives an external charge pump, which provides ±30v supply voltages at a few milliamps.
the maximum operating frequency for the external charge pump is approximately 120khz, so a jk flip-flop (or other divide-by-2 circuit connected between +5v and ground) is inserted in the oscillator line to lower the frequency applied to the pump. lower voltages can be obtained (±20v, for example) by connecting the anode of d1 and the cathode of d2 to ground instead of ±10v.
统计数据“解码”电动汽车热失控
我们现在是多网络共同发展阶段吗
一篇文章看懂HLS中的数据类型
PCB线路板抄板方法及步骤
4层板到12层板层叠设计案例
Transceiver IC Generates ±30V,
WT2605立体声蓝牙芯片概述及功能特点
毫米波雷达元器件市场格局,产业链一览
国内上市的首款5G手机 华为Mate 20 X 5G版本月起全球开卖
石墨烯电池的优缺点
坚硬超乎你的想象：LG gram笔记本暴力测试
5G技术支持下将全面提升VR/AR的体验
关于智能手机将步PC的介绍和应用
CA3140(IC1)用作电阻／电压变换器
100脚的STM32F103VE单片机通过FSMC接口读写DS12C887时钟芯片中的寄存器
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