原标题：ADI ADAQ7980 16位模数转换器(ADC)子系统开发方案

　　ADI公司的ADAQ7980/ADAQ7988是16位模数转换器(ADC)子系统,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封装(SiP)设计.器件内置一个高精度低功耗16位SARADC,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,工作温度范围为−55°C至+125°C,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/ADAQ7988主要特性,功能框图,应用电路,以及评估板EVAL-ADAQ7980SDZ主要特性,框图,电路图,材料清单和PCB设计图.

　　The ADAQ7980/ADAQ7988 are 16-bit analog-to-digital converter (ADC) subsystems 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 systems 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. Using the SDI input, 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°C to +125°C.

　　ADAQ7980/ADAQ7988主要特性:

　　Easy to use

　　Integrated data acquisition subsystem

　　All active components designed by Analog Devices, Inc.

　　On-board ADC driver and reference buffer

　　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

　　Pseudo differential ADC input structure

　　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

　　Low input bias current: 470 nA typical

　　Low power dissipation

　　21 mW typical at 1 MSPS (ADAQ7980)

　　16.5 mW typical at 500 kSPS (ADAQ7988)

　　Flexible power-down mode

　　Dynamic power scaling

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

　　Wide operating temperature range: −55°C to +125°C

　　ADAQ7980/ADAQ7988应用:

　　Automated test equipment (ATE)

　　Battery powered instrumentation

　　Communications

　　Data acquisition

　　Process control

　　Medical instruments

　　图1.ADAQ7980/ADAQ7988功能框图

　　图2.ADAQ7980/ADAQ7988同相ADC驱动器,增益=2

　　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 analog-to-digital converter (ADC) subsystem 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 should 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

　　EVAL-ADAQ7980SDZ包括:

　　EVAL-ADAQ7980SDZ evaluation board

　　Wall power supply 9 V dc adapter

　　Daughter card power connector Nylon screws

　　图3.评估板EVAL-ADAQ7980SDZ外形图