AD7982 18位、1 MSPS PulSAR® 7.0 mW ADC，采用MSOP或QFN封装

The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.The AD7982 is available in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.

AD7982是一款18位、逐次逼近型模数转换器（ADC）,采用单电源（VDD）供电。它内置一个低功耗、高速、18位采样ADC和一个多功能串行接口端口。在CNV上升沿,AD7982对IN+与IN-引脚之间的电压差进行采样,这两个引脚上的电压摆幅通常在0 V至V REF之间、相位相反。基准电压（REF）由外部提供,并且可以独立于电源电压（VDD）。其功耗和吞吐量呈线性变化关系。SPI兼容串行接口还能够利用SDI输入,将几个ADC以菊花链形式连结到单三线式总线上,并提供一个可选的忙闲指示。采用独立电源VIO时,该器件与1.8V、2.5V、3V和5V逻辑兼容。AD7982采用10引脚MSOP封装或10引脚QFN （LFCSP）封装,工作温度范围为−40°C至+85°C

AD7982 特点

• 18位分辨率、无失码
• 呑吐量：1 MSPS
• 积分非线性（INL）：典型值±1 LSB，最大值±2 LSB
• 低功耗
  7.0 mW（1 MSPS）
  70 µW（10 kSPS）
• 真差分模拟输入范围：±VREF
  0 V至V REF（V REF在2.5 V至5.0 V之间）
  可使用任一输入范围
  可采用ADA4941轻松驱动
• 动态范围：99 dB
• 无流水线延迟
• 采用2.5 V单电源供电，含1.8 V/2.5 V/3 V/5 V逻辑接口
• 串行接口：SPI®-/QSPI™-/MICROWIRE™-/DSP-兼容
• 以菊花链形式连接多个ADC和忙闲指示功能
• 10引脚封装：MSOP（MSOP-8尺寸）和3 mm × 3 mm QFN （LFCSP）（SOT-23尺寸）

AD7982 技术指标

• Resolution (Bits): 18bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• ADC Architecture: SAR
• Pkg Type: SOP

AD7982 应用领域

• 电池供电设备
• 数据采集系统
• 医疗仪器
• 地震数据采集系统

AD7982 功能框图

AD7982 建议配套产品

• Recommended Driver Amplifiers for the AD7982
  • For low noise and low power applications, we recommend the ADA4941 or the ADA4841-1.
  • For low noise and high frequency, we recommend the AD8021 or the ADA4899.
  • For a fully differential attenuating precision amplifier, we recommend the AD8475.
  • Recommended Reference Buffer Amplifier for the AD7982
  • For driving the voltage reference input, we recommend the AD8031 or the AD8605.
• Recommended Voltage References for the AD7982
  • For low drift and high current output applications, we recommend the ADR435 family of voltage references.
  • For low drift and lower cost sensitive applications, we recommend the ADR440 family of voltage references.
• Recommended Digital Isolators for the AD7982
  • For a 4-channel, 150Mbps data rate, we recommend the ADuM3441.
  • For a 3-channel, 90 Mbps data rate, we recommend the ADuM1300.
  • Recommended Voltage Regulators for the AD7982
  • For low dropout regulators with inputs up to 5V, we recommend the low noise ADP151 or the low power ADP160.
  • For high current switching regulators with inputs up to 5V, we recommend the low noise ADP2114.
• Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.
  • For selecting supervisor products, use the Supervisor Parametric Search.

AD7982 芯片订购指南

AD7982 应用技术支持与电子电路设计开发资源下载

1. AD7982 数据手册DataSheet下载 .PDF
2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
3. ADC模数转换器选型指南 .PDF