AD7984:  18-Bit,采样速率1.33 MSPS 的PulSAR型ADC,功耗为10.5 mW,采用MSOP/QFN封装

AD7984是一款18-bit、逐次逼近型模数转换器,采用单电源供电。它包含低功耗、高速、18-bit采样模数转换器以及一个多功能串行接口端口。在CNV上升沿,它对IN+和IN-引脚之间的电压差进行采样。这两个引脚上的电压通常在0V和VREF. 之间以相反相位摆动。参考电压（REF）是从外部施加的,并且可以独立于电源VDD设置。

SPI兼容串行接口还具有利用SDI输入将几个ADC以菊花链形式串联到单个三线式总线上的能力,并提供可选的忙指示。采用独立VIO电源,能兼容1.8V、2.5V、3V和5V逻辑。AD7984采用10引脚MSOP或10引脚QFN（LFCSP）封装,工作温度范围为−40°C至+85°C。

AD7984 特点

• 18-bit resolution with no missing codes
• Throughput: 1.33 MSPS
• Low power dissipation: 10.5 mW at 1.33 MSPS
• INL: ±2.25 LSB maximum
• Dynamic range: 99.7 dB typical
• True differential analog input range: ±VREF 0 V to VREF
  with VREF between 2.9 V to 5.0 V
  Allows use of any input range
  Easy to drive with the ADA4941
• No pipeline delay
• Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
• Serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
• Ability to daisy-chain multiple ADCs and busy indicator
• 10-lead MSOP (MSOP-8 size) and 10-lead 3 mm × 3 mm QFN (LFCSP), SOT-23 size

AD7984 技术指标

• Resolution (Bits): 18bit
• # Chan: 1
• Sample Rate: 1.33MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• ADC Architecture: SAR
• Pkg Type: CSP,SOP

AD7984 应用领域

• 电池供电设备
• 数据采集系统
• 医疗器械
• 地震数据采集系统

AD7984 建议配套产品

• Recommended Driver Amplifiers for the AD7984
  • For low noise, low power single-to-differential driver amplifier, we recommend the ADA4941-1.
  • For low noise, small size and low power, we recommend the ADA4841-1.
  • For low noise and high frequency, we recommend the ADA4898-1, AD8045, ADA4899-1 or the AD8021.
• For a fully differential attenuating precision amplifier, we recommend the AD8475.
• For 5V single supply and low noise, we recommend the AD8655.
• Recommended Reference Buffer Amplifiers for the AD7984
  • For a low impedance source, we recommend the AD8031 or the AD8605.
  • Recommended Precison External References for the AD7984
  • For a low noise, high accuracy 3V reference, we suggest the ADR433.
  • For a low noise, high accuracy 5V reference, we recommend the ADR435 or the ADR445.
• Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.
  • For selecting supervisor products, use the Supervisor Parametric Search.

AD7984 功能框图

AD7984 产品选型

产品型号	产品状态	封装	引脚	温度范围
AD7984BCPZ-R2	量产		10	工业
AD7984BCPZ-RL	量产	10 ld LFCSP (3x3mm)	10	工业
AD7984BCPZ-RL7	量产	10 ld LFCSP (3x3mm)	10	工业
AD7984BRMZ	量产	10 ld MSOP	10	工业
EVAL-AD7984CBZ	量产	评估板		工业
AD7984BRMZ-RL7	量产	10 ld MSOP	10	工业

AD7984 应用技术支持与电子电路设计开发资源下载

1. AD7984 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