原标题：TI DAC8775四路模拟输出模块参考设计TIPD215

　　TI公司的DAC8775是具有自适应功率管理的四路全集成16位数模转换器(DAC),可编程电流和电压输出,自适应功率管理可使芯片的功耗最小化,工作电压+12 V到+36 V,工作温度–40°C到+125°C,主要用在4mA-20mA电流回路,模拟输出模块,PLC,建筑物自动化,传感器发送器和过程控制.本文介绍了DAC8775主要特性,框图,以及具有自适应功耗管理的总功耗小于1W的四路模拟输出模块TIPD215参考设计主要特性,框图,电路图,材料清单和PCB设计图.

　　The DAC8775 is a quad-channel precision, fullyintegrated, 16-bit, digital-to-analog converter (DAC)with adaptive power management, and is designed tomeet the requirements of industrial controlapplications. The adaptive power managementcircuit, when enabled, minimizes the powerdissipation of the chip. When programmed as acurrent output, the supply voltage on the currentoutput driver is regulated between 4.5 V and 32 Vbased on continuous feedback of voltage on thecurrent output pin via an integrated buck/boostconverter. When programmed as a voltage output,this circuit generates a programmable supply voltagefor the voltage output stage (±15 V). DAC8775 alsocontains an LDO to generate the digital supply (5 V)from a single power supply pin.

　　DAC8775 is also implemented with a HighwayAddressable Remote Transducer (HART) SignalInterface to superimpose an external HART signal onthe current output. The slew rate of the current outputDAC is register programmable. The device canoperate with a single external power supply of +12 Vto +36 V using the integrated buck/boost converters

　　or with external power supplies when the buck/boostconverters are disabled.

　　DAC8775主要特性:

　　1• Output Current:

　　– 0 mA to 24 mA; 3.5 mA to 23.5 mA; 0 mA to20 mA; 4 mA to 20 mA; ±24 mA

　　• Output Voltage (with/without 20% over-range):

　　– 0 V to 5 V; 0 V to 10 V; ±5 V; ±10 V

　　– 0 V to 6 V; 0 V to 12 V; ±6 V; ±12 V

　　• Adaptive Power Management

　　• Single Wide Power Supply Pin (12 V – 36 V )

　　• ±0.1% FSR Total Unadjusted Error (TUE)

　　• DNL: ±1 LSB Max

　　• Internal 5-V Reference (10 ppm/°C max)

　　• Internal 5-V Digital Power Supply Output

　　• CRC/Frame Error Check, Watchdog Timer

　　• Thermal Alarm, Open/Short Circuit for SystemReliability

　　• Safe Actions on Alarm Condition

　　• Auto Learn Load Detection

　　• Wide Temperature Range: –40°C to +125°C

　　DAC8775应用:

　　• 4-mA to 20-mA Current Loops

　　• Analog Output Modules

　　• Programmable Logic Controllers (PLCs)

　　• Building Automation

　　• Sensor Transmitters

　　• Process Control

　　具有自适应功耗管理的总功耗小于1W的四路模拟输出模块TIPD215参考设计

　　This quad-channel, analog output module delivers voltage and current outputs using the highly integrated DAC8775 digital-to-analog converter (DAC). Integrated adaptive power management, along with the LM5166 buck converter, reduces the total power dissipation of the reference design to less than 1 W, even when driving all four channels at 20 mA simultaneously.

　　TIPD215参考设计主要特性:

　　<1-W of Total Power Dissipation driving all four-channels at 20-mA

　　<0.1 %FSR of Total Unadjusted Error in either Voltage or Current mode

　　8-µA of Peak-to-Peak Current Output Ripple

　　200-µV of Peak-to-Peak Voltage Output Ripple

　　Adaptive Power Management for Current Outputs

　　TIPD215参考设计应用:

　　• Factory Automation & Control

　　• Building Automation

　　• Motor Drives

　　图.TIPD215参考设计外形图

　　TIPD215参考设计材料清单: