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[原创] ADI AD5753单路16位电流和电压DAC解决方案

关键词:电源管理 数模转换器(DAC) 工业控制 PLC HART网络 过程控制

时间:2019-06-04 10:52:06       来源:中电网

ADI公司的AD5753是单路16位具有动态功率控制和HART连接的电流和电压数模转换器(DAC),工作电压从AVSS的-33V到AVDD1的+33V,两轨间电压高达60V,单端可获得电压或电流输出,电流输出范围:0mA到20mA,4mA到20mA,0mA到24mA,±20mA,±24 mA和−1 mA 到+22 mA,电压输出范围: 0V到5V,0V到10V,±5V和±10V,用户可编程失调和增益,具有片上诊断包括12位ADC,2个ADC输入引脚,片上基准,包括输出故障保护的功能强大的架构,工作温度−40℃到+115℃,主要用在过程控制,激励器控制,通路隔离模拟输出,可编程逻辑控制器(PLC)和分布控制系统(DCS)应用,HART网络连接.本文介绍了AD5753产品亮点和主要特性,功能框图,包含AD5753模块样品框图以及评估板EVAL-AD5753SDZ主要特性,电路图,材料清单和PCB设计图.

The AD5753 is a single-channel, voltage and current output digital-to-analog converter (DAC) that operates with a power supply range from a minimum of −33 V on AVSS to a maximum of +33 V on AVDD1 with a maximum operating voltage of 60 V between the two rails. On-chip dynamic power control (DPC) minimizes package power dissipation. This minimization is achieved by using buck dc-to-dc converters optimized for minimum on-chip power dissipation to regulate the voltage (VDPC+ and VDPC−) that is sent to the VIOUT output driver circuitry from the ±5 V to ±27 V supply voltage. The CHART pin enables a Highway Addressable Remote Transducer® (HART) signal to be coupled on the current output. The AD5753 uses a versatile, 4-wire, serial peripheral interface (SPI) that operates at clock rates of up to 50 MHz and is compatible with standard SPI, QSPI™, MICROWIRE™, digital signal processor (DSP), and microcontroller interface standards. The interface features an optional SPI cyclic redundancy check (CRC) and a watchdog timer (WDT). The AD5753 offers improved diagnostic features from earlier versions of similar DACs, such as output current monitoring and an integrated, 12-bit diagnostic analog-to-digital converter (ADC). The inclusion of a line protector on the VIOUT, +VSENSE, and −VSENSE pins provides additional robustness.

AD5753产品亮点:

1. Range of advanced diagnostic features, including integrated ADC with two external input pins.
2. DPC, using integrated buck dc-to-dc converters for thermal management, which enables higher channel count in small size module housing.
3. Programmable power control (PPC) mode to enable faster than DPC settling time (15 μs typical).
4. Highly robust with output protection from miswire events (±38 V).
5. HART compliant.

AD5753主要特性:

16-bit resolution and monotonicity
Positive and negative DPC for thermal management
Current or voltage output available on a single terminal
Current output ranges: 0 mA to 20 mA, 4 mA to 20 mA,0mA to 24mA, ±20mA, ±24 mA, and −1 mA to +22 mA
Voltage output ranges (with 20% overrange): 0V to 5V,0V to 10V,±5V,and ±10V
User programmable offset and gain
Advanced on-chip diagnostics, including a 12-bit ADC
2 external ADC input pins
On-chip reference
Robust architecture, including output fault protection
−40℃ to +115℃ temperature range
40-lead,6 mm×6 mm LFCSP package

AD5753应用:

Process control
Actuator control
Channel isolated analog outputs
Programmable logic controller (PLC) and distributed control systems (DCS) applications
HART network connectivity

图1.AD5753功能框图

图2.包含AD5753模块样品框图

评估板EVAL-AD5753SDZ

This user guide explains how to use the EVAL-AD5753SDZ to evaluate the AD5753, a single-channel, 16-bit voltage and current output, digital-to-analog converter (DAC) with on-chip positive and negative dynamic power control (DPC) that minimizes package power dissipation. The EVAL-SDP-CS1Z system demonstration platform (SDP-S) board is required when using the EVAL-AD5753SDZ board. The EVAL-AD5753SDZ (see Figure 1) interfaces to the USB port of the PC via the EVAL-SDP-CS1Z (SDP-S). Analysis Control Evaluation (ACE) software is available to use with the EVAL-AD5753SDZ, and allows the programming of the AD5753. For full details on the AD5753, refer to the AD5753 data sheet. Consult the AD5753 data sheet in conjunction with this user guide when using the EVAL-AD5753SDZ. The configuration of the various link options is explained in the Evaluation Board Hardware section. The installation of the companion software is discussed in the Software Quick Start Procedures section.

评估板EVAL-AD5753SDZ主要特性:

Fully featured evaluation board for the AD5753
On-board, 2.5 V ADR4525 reference
SPI communication
EVALUATION KIT CONTENTS
EVAL-AD5753SDZ evaluation board Analog Devices,Inc.,EVAL-SDP-CS1Z (SDP-S) board

图3.评估板EVAL-AD5753SDZ外形图

图4.评估板EVAL-AD5753SDZ电路图(1):电源和基准选择

图5.评估板EVAL-AD5753SDZ电路图(2):连接图,地址引脚,LDAC引脚和重置引脚

图6.评估板EVAL-AD5753SDZ电路图(3):AD5753

图7.评估板EVAL-AD5753SDZ电路图(4):AD5753输出级
评估板EVAL-AD5753SDZ材料清单:



图8.评估板EVAL-AD5753SDZ PCB设计图:丝印

图9.评估板EVAL-AD5753SDZ PCB设计图:层1

图10.评估板EVAL-AD5753SDZ PCB设计图:地和电源面,层2和层3

图11.评估板EVAL-AD5753SDZ PCB设计图:层4
详情请见:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD5753.pdf
https://www.analog.com/media/en/technical-documentation/user-guides/EVAL-AD5753SDZ-UG-1492.pdf
EVAL-AD5753SDZ-UG-1492.pdf
AD5753.pdf

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