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AD7294:集成多通道ADC、DAC、温度传感器和电流检测功能的12位监控和控制系统

AD7294是一款单芯片解决方案,集电流、电压和温度监控和控制所需的全部通用功能于一体。该器件包括用于分流电阻电流监控的低压(±200 mV)模拟输入检测放大器、温度检测输入和四个非专用型模拟输入通道,这些通道以多路复用方式接入一个转换时间为3µs的SAR模数转换器(ADC)。数模转换器(DAC)和ADC均通过高精度内部参考电压驱动。四个12位DAC为电压控制提供所需输出。AD7294同时还包括用于警报功能的界限寄存器。该器件基于ADI高压DMOS工艺设计而成,符合其高电压要求:电流检测输入为59.4V,DAC输出电压最高可达15V。

AD7294是一款高度集成的解决方案,包括对蜂窝基站应用中的功率放大器进行精确控制所需要的全部功能。在这类应用中,DAC可提供12位分辨率,用以控制功率晶体管的偏置电流;同时集成基于热二极管的温度传感器,以补偿温度效应;ADC对高端电流和温度进行监控;所有这些功能全都集成在这款64引脚TQFP封装的器件之内,其工作温度为:-40°C至+105°C。

The AD7294 contains all the functions required for general-purpose monitoring and control of current, voltage, and temperature integrated into a single-chip solution. The part includes low voltage (±200 mV) analog input sense amplifiers for current monitoring across shunt resistors, temperature sense inputs, and four uncommitted analog input channels multiplexed into a SAR analog-to-digital converter (ADC) with a 3 μs conversion time. A high accuracy internal reference is provided to drive both the digital-to-analog converter (DAC) and ADC. Four 12-bit DACs provide the outputs for voltage control. The AD7294 also includes limit registers for alarm functions. The part is designed on Analog Devices, Inc., high voltage DMOS process for high voltage compliance, 59.4 V on the current sense inputs, and up to a 15 V DAC output voltage.

The AD7294 is a highly integrated solution that offers all the functionality necessary for precise control of the power amplifier in cellular base station applications. In these types of applications, the DACs provide 12-bit resolution to control the bias currents of the power transistors. Thermal diode-based temperature sensors are incorporated to compensate for temperature effects. The ADC monitors the high-side current and temperature. All this functionality is provided in a 64-lead TQFP operating over a temperature range of −40°C to +105°C.

AD7294 特性
AD7294 技术指标
AD7294 应用领域
AD7294 建议配套产品
AD7294 功能框图

AD7294 芯片订购指南
产品型号 封装 引脚 温度范围 包装和数量 报价*(100-499) 报价*1000 pcs RoHS
AD7294BCPZ 产品状态: 量产 56 ld LFCSP (8x8mm) 56 工业 Tray, 260 $ 11.56 $ 9.83
AD7294BCPZRL 产品状态: 量产 56 ld LFCSP (8x8mm) 56 工业 Reel, 2500 - $ 9.83
AD7294BSUZ 产品状态: 量产 64 ld TQFP(7x7mm) 64 工业 Tray, 250 $ 11.56 $ 9.83
AD7294BSUZRL 产品状态: 量产 64 ld TQFP(7x7mm) 64 工业 Reel, 2000 - $ 9.83
EVAL-AD7294EBZ 产品状态: 量产 评估板 -   1 $ 150.00 $ 150.00
AD7294 应用技术支持与电子电路设计开发资源下载
  1. AD7148 数据手册DataSheet下载 .PDF
  2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
  3. ADC模数转换器选型指南 .PDF