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[原创] ADI AD5679R 16路16位nanoDAC+解决方案

关键词:无线通信 基站 过程控制 工业自动化 数据采集系统 AD5679R

时间:2019-09-25 11:26:09       来源:中电网

ADI公司的AD5679R是低功耗16路16位缓冲电压输出的数模转换器(nanoDAC),集成了2.5V 2 ppm/℃内部基准电压(默认使能),它的增益选择引脚可获得输出电压2.5V(增益=1)或5V(增益=2).器件工作电压从2.7V到5.5V.器件具有高性能和相对精确度(INL)在16位时为±4 LSB,TUE为FSR的±0.14%,失调误差±1.5 mV,增益误差为FSR的±0.06%,2.5V基准电压温度系数低飘移,典型为2 ppm/℃,短路电流40mA,工作温度−40℃ 到+125℃,1.8V逻辑兼容,50MHz 带回读或菊化链的SPI,24引脚4mmx4mm RoHS兼容LFCSP封装,主要用在光收发器,基站功率放大器,过程控制(PLC输入/输出卡),工业自动化,和数据采集系统.本文介绍了AD5679R产品亮点和主要特性,功能框图,菊花链接到Motorola 68HC11连接图以及评估板EVAL-AD5679RSDZ主要特性,电路图,材料清单和PCB设计图.

The AD5679R is a low power, 16-channel, 16-bit, buffered voltage output, digital-to-analog converter (DAC) that includes a 2.5 V, 2 ppm/℃ internal reference (enabled by default), and a gain select pin, resulting in a full-scale output of 2.5 V (gain = 1) or 5 V (gain = 2). The device operates from a single, 2.7 V to 5.5 V supply range and is guaranteed monotonic by design. The AD5679R is available in a 28-lead lead frame chip scale package (LFCSP) and incorporates a power-on reset (POR) circuit that ensures that the DAC outputs power up to and remains at zero- scale until a valid write. The AD5679R contains a power-down mode that reduces the current consumption to 2 μA typical when in power-down mode.

AD5679R产品亮点:

1. High channel density 16 channels in 4 mm × 4 mm LFCSP
2. High relative accuracy (integral nonlinearity (INL)) ±4 LSB maximum
3. Low drift, 2.5 V, on-chip reference

AD5679R主要特性:

High performance
High relative accuracy (INL): ±4 LSB maximum at 16 bits
TUE: ±0.14% of FSR maximum
Offset error: ±1.5 mV maximum
Gain error: ±0.06% of FSR maximum
Low drift 2.5 V voltage reference temperature coefficient: 2 ppm/℃ typical
40 mA short-circuit current
Wide operating ranges −40℃ to +125℃ temperature range
2.7 V to 5.5 V power supply range
Simplified implementation
User selectable gain of 1 or 2 (GAIN pin)
1.8 V logic compatibility
50 MHz SPI with readback or daisy chain
28-lead, 4 mm × 4 mm, RoHS compliant LFCSP

AD5679R应用:

Optical transceivers
Base station power amplifiers
Process control (programmable logic controller (PLC) input/output cards)
Industrial automation
Data acquisition systems

图1.AD5679R功能框图

图2.AD5679R菊花链接到Motorola 68HC11连接图

评估板EVAL-AD5679RSDZ

 This user guide details the operation of the EVAL-AD5679RSDZ for the AD5679R 16-bit, 16-channel, voltage output, digital-to- analog converter (DAC). The EVAL-AD5679RSDZ allows users to quickly prototype AD5679R circuits and reduce design time. The AD5679R operates from a single 2.7 V to 5.5 V supply range. The AD5679R incorporates an internal 2.5 V reference to give an output voltage of 2.5 V or 5 V. The EVAL-AD5679RSDZ also incorporates additional voltage references. The EVAL-AD5679RSDZ interfaces to the USB port of a PC via a system demonstration platform (SDP-B) board. The Analysis | Control | Evaluation (ACE) software is available for download from the EVAL-AD5679RSDZ product page to use with the evaluation board to allow the user to program the AD5679R. A peripheral module interface (PMOD) connection is also available to allow the connection of microcontrollers to the evaluation board without the SDP-B board. When a microcontroller is used through the PMOD connection, the SDP-B board must be disconnected, and the user is unable to operate the ACE software. The EVAL-AD5679RSDZ is compatible with any Analog Devices, Inc., SDP-B board, which can be purchased separately. A typical connection between the EVAL-AD5679RSDZ and the SDP-B controller board is shown in Figure 1. For full details, see the AD5679R data sheet, which must be used in conjunction with this user guide when using the EVAL- AD5679RSDZ.

评估板EVAL-AD5679RSDZ主要特性:

Full featured evaluation board for the AD5679R
Various link options
PC control in conjunction with the Analog Devices, Inc., SDP board
EVALUATION KIT CONTENTS
EVAL-AD5679RSDZ
USB cable

图3.评估板EVAL-AD5679RSDZ外形图

图4.评估板EVAL-AD5679RSDZ电路图(1):SDP, Arduino兼容,PMOD连接器

图5.评估板EVAL-AD5679RSDZ电路图(2):主电路

图6.评估板EVAL-AD5679RSDZ电路图(3):输出连接器
评估板EVAL-AD5679RSDZ材料清单:


图7.评估板EVAL-AD5679RSDZ PCB设计图(1):顶层元件布放图


图8.评估板EVAL-AD5679RSDZ PCB设计图(2):顶层走线图

图9.评估板EVAL-AD5679RSDZ PCB设计图(3):底层元件布放图

图10.评估板EVAL-AD5679RSDZ PCB设计图(4):底层走线图
详情请见:


AD5679R.pdf
EVAL-AD5679RSDZ-UG-1463.pdf

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