关于说明书库
说明书库是一家公益性质网站，主要提供众多产品的说明书阅读和下载，为各行业产品用户提供使用学习便利。所有说明书均来自互联网和网友投稿贡献，如果您认为某些文件侵犯了您的权益，或不想继续公开，请与我们联系删除。同时我们也欢迎您的投稿。电话与微信：18977110085
The MAX4473 PA power control IC is intended for closed-loop bias control of GSM power amplifiers. The device facilitates accurate control of the current deliv- ered to the power amplifier (PA) through a control volt- age. The error amplifier senses the voltage drop across an external current-sense resistor placed between the supply and the PA. The output of the error amplifier adjusts the PA gain until the current is proportional to the power control voltage applied to the MAX4473. This unique topology is useful in time-division-multiple- access (TDMA) systems, such as GSM, where accurate transmit burst shaping and power control is required. User-selectable current sensing and gain setting resis- tors maximize flexibility. The MAX4473 operates from a single 2.7V to 6.5V sup- ply and typically draws 1.2mA of supply current. The error amplifier has a common-mode range that extends from 1V to VCC. The power control input and error amplifier outputs swing rail-to-rail. A low-power shut- down mode reduces supply current to less than 1µA and activates an on-board active pull-down at the error amplifier output. Fast enable/disable times of 0.9µs reduce average power consumption without compro- mising dynamic performance. The MAX4473 is avail- able in a space-saving 8-pin µMAX® package.