原标题：ADI ADAQ7980 16位ADC μModule 数据采集系统方案

　　ADI公司的ADAQ7980/ADAQ7988是16位模数转换器(ADC) μModule® 数据采集系统,集成了四个常见信号处理和调理模块,采用支持各种应用的系统级封装(SiP)设计.内置一个高精度低功耗16位SAR ADC,一个低功耗高带宽高输入阻抗ADC驱动器,一个稳定的低功耗基准电压缓冲器和一个高效的电源管理模块,可简化数据采集系统的设计过程.主要用在自动测试设备(ATE),电池供电仪器仪表,通信,数据采集,过程控制和医疗仪器.本文介绍了ADAQ7980主要特性,框图,以及评估板EVAL-ADAQ7980SDZ主要特性,简化框图,电路图,材料清单和PCB设计图.

　　易于使用

　　μModule数据采集系统

　　全部有源元件皆由ADI公司设计

　　节省50% PCB面积

　　包含关键无源元件

　　SPI/QSPI/MICROWIRE™/DSP兼容串行接口

　　以菊花链形式连接多个ADAQ7980/ADAQ7988器件

　　多功能电源配置，1.8 V/2.5 V/3 V/5 V逻辑接口

　　高性能

　　16位分辨率、无失码

　　吞吐速率：1 MSPS

　　积分非线性(INL)：±8 ppm(典型值)，20 ppm(最大值)

　　信噪比(SNR)：91.5 dB(典型值，10 kHz，单位增益)

　　总谐波失真(THD)：-105 dB (10 kHz)

　　零误差：±0.06 mV(典型值，单位增益)

　　零误差温度漂移：1.3 μV/°C(最大值)

　　低功耗

　　21 mW典型值(1 MSPS)

　　灵活的省电模式

　　24引脚5 mm × 4 mm小型LGA封装

　　出色的ESD额定值

　　3500 V人体模型(HBM)

　　1250 V场感应充电装置模型(FICDM)

　　宽工作温度范围：-55°C至+125°C

　　优势和特点

　　ADAQ7980的全功能评估板

　　多功能模拟信号调理电路

　　板载基准电压源、基准电压缓冲器和ADC驱动器

　　兼容SDP板(EVAL-SDP-CB1Z)

　　PC软件用于时域和频域的控制和数据分析

　　ADAQ7980/ADAQ7988均为16位模数转换器(ADC) μModule® 数据采集系统，系统中集成四个常见信号处理和调理模块，采用支持各种应用的系统级封装(SiP)设计。这些器件集成最关键的无源元件，从而消除与使用逐次逼近寄存器(SAR) ADC的传统信号链相关的许多设计挑战。这些无源元件是实现额定器件性能的关键因素。

　　ADAQ7980/ADAQ7988内置一个高精度、低功耗、16位SAR ADC，一个低功耗、高带宽、高输入阻抗ADC驱动器，一个稳定的低功耗基准电压缓冲器和一个高效的电源管理模块。这些产品采用5 mm × 4 mm小型LGA封装，可简化数据采集系统的设计过程。ADAQ7980/ADAQ7988的系统集成度解决了许多设计挑战难题，同时提供灵活的可配置ADC驱动器反馈环路，以便调整增益和/或共模。一组四个器件电源提供出色的系统性能;但是，可实现单电源工作且对器件工作规格的影响很小。

　　ADAQ7980/ADAQ7988集成在外形与集成电路(IC)一样紧凑的关键元件中，这些元件常用于数据采集信号链设计中。μModule系列将元件选型、优化和布局等设计负担从设计人员转移到器件上，缩短了整体设计时间，减少了系统故障，最终加快了产品上市时间。

　　串行外设接口(SPI)兼容串行接口能够将多个器件以菊花链形式连结到单三线式总线上，并提供一个可选的繁忙指示。用户接口与1.8 V、2.5 V、3 V或5 V逻辑兼容。

　　这些器件的额定工作温度范围为−55°C至+125°C。

　　应用

　　自动测试设备(ATE)

　　电池供电仪器仪表

　　通信

　　数据采集

　　过程控制

　　医疗仪器

　　The ADAQ7980/ADAQ7988 are 16-bit analog-to-digital converter (ADC) μModule® data acquisition systems that integrate four common signal processing and conditioning blocks into a system in package (SiP) design that supports a variety of applications. These devices contain the most critical passive components, eliminating many of the design challenges associated with traditional signal chains that use successive approximation register (SAR) ADCs. These passive components are crucial to achieving the specified device performance.

　　The ADAQ7980/ADAQ7988 contain a high accuracy, low power, 16-bit SAR ADC, a low power, high bandwidth, high input impedance ADC driver, a low power, stable reference buffer, and an efficient power management block. Housed within a tiny, 5 mm × 4 mm LGA package, these products simplify the design process for data acquisition systems. The level of system integration of the ADAQ7980/ADAQ7988 solves many design challenges, while the devices still provide the flexibility of a configurable ADC driver feedback loop to allow gain and/or common-mode adjustments.A set of four device supplies provides optimal system performance; however,single-supply operation is possible with minimal impact on device operating specifications. The ADAQ7980/ADAQ7988 integrate within a compact, integrated circuit (IC)-like form factor key components commonly used in data acquisition signal chain designs. The μModule family transfers the design burden of component selection,optimization, and layout from designer to device, shortening overall design time, system troubleshooting, and ultimately improving time to market. The serial peripheral interface (SPI)-compatible serial interface features the ability to daisy-chain multiple devices on a single, 3- wire bus and provides an optional busy indicator. The user interface is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic. Specified operation of these devices is from −55℃ to +125℃.

　　ADAQ7980主要特性:

　　Easy to use

　　μModule data acquisition system

　　All active components designed by Analog Devices, Inc.

　　50% PCB area savings

　　Includes critical passive components

　　SPI-/QSPI-/MICROWIRE™-/DSP-compatible serial interface

　　Daisy-chain multiple ADAQ7980/ADAQ7988 devices

　　Versatile supply configuration with 1.8 V/2.5 V/3 V/5 V logic interface

　　High performance

　　16-bit resolution with no missing codes

　　Throughput: 1 MSPS (ADAQ7980) and 500 kSPS (ADAQ7988)

　　INL: ±8 ppm typical and 20 ppm maximum

　　SNR: 91.5 dB typical at 10 kHz (unity gain)

　　THD: −105 dB at 10 kHz Zero error: ±0.06 mV typical (unity gain)

　　Zero error temperature drift: 1.3 μV/°C maximum

　　Low power dissipation

　　21 mW typical at 1 MSPS (ADAQ7980)

　　16.5 mW typical at 500 kSPS (ADAQ7988)

　　Flexible power-down modes

　　Small, 24-lead, 5 mm × 4 mm LGA package

　　Excellent ESD ratings

　　3500 V human body model (HBM)

　　1250 V field-induced charged device model (FICDM)

　　Wide operating temperature range: −55℃ to +125℃

　　ADAQ7980应用:

　　Automated test equipment (ATE)

　　Battery powered instrumentation

　　Communications

　　Data acquisition

　　Process control

　　Medical instruments

　　评估板EVAL-ADAQ7980SDZ

　　The EVAL-ADAQ7980SDZ is an evaluation board designed to demonstrate the low power ADAQ7980 performance and provide an easy to understand interface for a variety of system applications. The ADAQ7980 is a 16-bit, 1 MSPS, μModule data acquisition system that integrates four common signal processing and conditioning blocks into a system in package (SiP) design that supports a variety of applications.

　　The EVAL-ADAQ7980SDZ can also evaluate the ADAQ7988, despite being populated with the ADAQ7980. To mimic the evaluation of the ADAQ7988 performance, limit the maximum sample rate of the ADAQ7980 to 500 kSPS in the ADAQ798x Evaluation Software.

　　The evaluation board is ideal for use with the Analog Devices, Inc., system demonstration platform (SDP) board, EVAL-SDP-CB1Z. The EVAL-ADAQ7980SDZ interfaces to the SDP board via a 120-pin connector. P1, P2, P3, and P4 SMA connectors are provided to connect a low noise analog signal source.

　　The ADAQ798x Evaluation Software executable controls the evaluation board over the USB through the EVAL-SDP-CB1Z. See the Related Links section for a list of on-board components.

　　A full description and complete specifications for the ADAQ7980 are provided in the ADAQ7980/ADAQ7988 data sheet and must be consulted in conjunction with this user guide when using the evaluation board. Full details on the EVAL-SDP-CB1Z are available on the SDP-B product page.

　　评估板EVAL-ADAQ7980SDZ主要特性:

　　Full featured evaluation board for the ADAQ7980

　　Versatile analog signal conditioning circuitry

　　On-board reference, reference buffers, and ADC drivers

　　SDP board-compatible (EVAL-SDP-CB1Z)

　　PC software for control and data analysis of time and frequency domain

　　评估板EVAL-ADAQ7980SDZ包括:

　　EVAL-ADAQ7980SDZ evaluation board

　　Wall power supply 9 V dc adapter

　　Daughter card power connector

　　Nylon screws

　　图.评估板EVAL-ADAQ7980SDZ外形图