ADI公司的AD5767是16路12位电压输出denseDAC数模转换器(DAC), 采用外部2.5 V 基准电压产生输出电压,集成了输出缓冲器,后者具有20 mA的吸电流或源电流能力.结合这些缓冲器,通过专用扰动引脚可以将低频信号叠加在各DAC输出上.采用多功能四线式串行接口，写入模式下能够以最高50 MHz 的时钟速率工作,并与串行外设接口(SPI),QSPI™, MICROWIRE™和DSP 接口标准兼容.主要用在Mach Zehnder调制器偏置控制,光学模块,偏置控制和模拟输出模块.本文介绍了AD5767主要特性,功能框图,以及评估板EVAL-AD5767SD2Z主要特,电路图,材料清单和PCB设计图.

　　The DAC generates output voltage ranges from an external 2.5 V reference. Depending on the voltage range selected, the midpoint of the output span can be adjusted, allowing a minimum output voltage as low as −20 V or a maximum output voltage of up to +14 V. Each of the 16 channels can be monitored with an integrated output multiplexer.

　　The AD5767 has integrated output buffers that can sink or source up to 20 mA. In conjunction with these buffers, a low frequency signal can be superimposed onto each DAC output via dedicated dither pins. These dedicated dither pins simplify the system design by reducing the number of external components required for a similar external implementation, like operational amplifiers or resistors. The reduction of external components makes the AD5767 suitable for indium phosphide Mach Zehnder modulator (InP MZM) biasing applications.

　　The device incorporates a power-on reset (POR) circuit that ensures that the DAC outputs are clamped to GND on power up and remain at this level until the output range of the DAC is configured. The outputs of all DACs are updated through register configuration, with the added functionality of user-selectable DAC channels to be simultaneously updated.

　　The AD5767 utilizes a versatile 4-wire serial interface that operates at clock rates of up to 50 MHz for write mode and is compatible with serial peripheral interface (SPI), QSPI™, MICROWIRE™, and DSP interface standards. The AD5767 also contains a VLOGIC pin intended for 1.8 V/3 V/5 V logic.

　　The AD5767 is available in a 4 mm × 4 mm WLCSP package and a 40-lead LFCSP package. The AD5767 operates at a temperature range of −40 ℃ to +105℃.

　　AD5767主要特性:

　　Complete 16-channel, 12-bit digital-to-analog converter

　　4 mm × 4 mm WLCSP package

　　Integrated DAC output buffers with ±20 mA output current capability

　　Integrated reference buffers

　　Channel monitoring multiplexer

　　1.8 V logic compatibility

　　Temperature range: −40℃ to +105℃

　　AD5767应用:

　　Mach Zehnder modulator bias control

　　Optical modules

　　Bias control

　　Analog output modules

　　图1. AD5767功能框图

　　评估板EVAL-AD5767SD2Z

　　The EVAL-AD5767SD2Z is a fully featured evaluation board that allows the user to easily evaluate all the features of the AD5767 16-channel, 12-bit, voltage output digital-to-analog converter (DAC).

　　This board also integrates a power solution using the ADP5071 switching regulator to generate a bipolar supply of +8 V and −22 V from a +3.3 V input, allowing a DAC voltage output range of −20 V to +6 V. Alternatively, supplying the DAC with a linear power supply via the on-board connector (J9) achieves all ranges.

　　The AD5767 can be controlled using the on-board connector (J10) or the EVAL-SDP-CB1Z SDP board (via J1). The SDP allows the evaluation board to be controlled through the USB port of a Windows®-based PC using the AD5767 evaluation software.

　　The AD5767 is a 16-channel, 12-bit voltage output denseDAC®. The DAC generates output ranges from a 2.5 V reference. The AD5767 also integrates output buffers allowing the device to source or sink up to 20 mA. The range is software selectable, and any channel can be routed to the monitor pin for external monitoring. The integration of the reference and output buffers allows an easy to use universal solution.

　　The device requires four power supplies. AVDD and AVSS are the positive and negative high voltage power supplies, AVCC is the analog supply for the low voltage DAC circuitry, and a VLOGIC supply pin sets the logic levels for the digital interface pins.

　　The ACE software provides an intuitive graphic user interface (GUI), allowing all of the AD5767 modes of operation to be configured over the synchronous serial port (SPORT) interface. The ACE software also has plugin modules for many other Analog Devices evaluation boards and Circuits from the Lab® (CFTL) demo boards.

　　Complete specifications for the AD5767 are available in the AD5767 data sheet, which must be consulted in conjunction with this user guide when using this evaluation board.

　　评估板EVAL-AD5767SD2Z主要特性:

　　Full featured evaluation board for the AD5767 with the ADP5071 power solution

　　PC control in conjunction with the Analog Devices, Inc., EVAL-SDP-CB1Z system demonstration platform (SDP)

　　Power solution generated from a single 3.3 V supply

　　PC software for control using analysis/control/evaluation (ACE) software

　　图2.评估板EVAL-AD5767SD2Z外形图

　　图3.评估板EVAL-AD5767SD2Z电路图(1):SDP连接器和电源

　　图4.评估板EVAL-AD5767SD2Z电路图(2):ADP5071电源解决方案

　　图5.评估板EVAL-AD5767SD2Z电路图(3):AD5767(WLCSP)和外部参考电路

　　图6.评估板EVAL-AD5767SD2Z电路图(4):通路输出

　　评估板EVAL-AD5767SD2Z材料清单(BOM):

　　图7.评估板EVAL-AD5767SD2Z PCB设计图(1):顶层PCB图

　　图8.评估板EVAL-AD5767SD2Z PCB设计图(2):内部第一层PCB

　　图9.评估板EVAL-AD5767SD2Z PCB设计图(3):内部第二层PCB

　　图10.评估板EVAL-AD5767SD2Z PCB设计图(4):底层PCB

　　Analog Devices, Inc.(简称ADI)。中国注册公司名字为“亚德诺半导体技术(上海)有限公司。美国纳斯达克上市公司 (NASDAQ代码: ADI)。

　　将创新、业绩和卓越作为企业的文化支柱，并基此成长为该技术领域最持久高速增长的企业之一。ADI公司是业界认可的数据转换和信号处理技术全球领先的供应商，拥有遍布世界各地的60,000客户，涵盖了全部类型的电子设备制造商。作为领先业界40多年的高性能模拟集成电路(IC)制造商，ADI的产品用于模拟信号和数字信号处理领域。

　　公司总部设在美国马萨诸塞州诺伍德市，设计和制造基地遍布全球。ADI公司被纳入标准普尔500指数(S&P 500 Index)。

　　Analog Devices, Inc.(简称ADI)。中国注册公司名字为“亚德诺半导体技术(上海)有限公司。美国纳斯达克上市公司 (NASDAQ代码: ADI)。

　　将创新、业绩和卓越作为企业的文化支柱，并基此成长为该技术领域最持久高速增长的企业之一。ADI公司是业界认可的数据转换和信号处理技术全球领先的供应商，拥有遍布世界各地的60,000客户，涵盖了全部类型的电子设备制造商。作为领先业界40多年的高性能模拟集成电路(IC)制造商，ADI的产品用于模拟信号和数字信号处理领域。

　　公司总部设在美国马萨诸塞州诺伍德市，设计和制造基地遍布全球。ADI公司被纳入标准普尔500指数(S&P 500 Index)。

　　在科技革命的推动下，人类社会开启工业化革命的进程，客观上促进了经济全球化及城市化的进一步发展。全球化对通信技术提出了更高挑战，城市化的趋势则对交通等基础设施提出了更高的要求。与此同时，传统能源大量消耗带来的全球气候变暖及资源稀缺问题，人口老龄化的加速对医疗行业提出的更高要求，无疑都是当今面临的挑战。半导体技术的快速发展将在应对这些变化所带来的挑战中扮演重要的角色。ADI公司以创新为基石，致力于通信基础设施、工业自动化、工业仪表、汽车电子以及医疗保健等领域的研发与投入，为解决各行各业面对的挑战，提供高性能的产品及解决方案。

　　详情请见:

EVAL-AD5767SD2Z-UG-1070.pdf

AD5767.pdf