AD7942: 14位、250 kSPS PulSAR®、伪差分ADC,采用MSOP或QFN封装

The AD7942 is a 14-bit, charge redistribution, successive approximation PulSAR® ADC that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input, IN+, between 0 V to VREF with respect to a ground sense, IN−. The reference voltage, VREF, is applied externally and is set up to be the supply voltage. Its power scales linearly with the 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, or 5 V logic using a separate supply (VIO).

The AD7942 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) package yet fits in the same size footprint as the 8-lead MSOP or SOT-23. Operation for the AD7942 is specified from −40°C to +85°C.

AD7942是一款14位、电荷再分配、逐次逼近型PulSAR® ADC,采用2.3 V至5.5 V单电源(VDD)供电。它内置一个低功耗、高速、14位无失码的采样ADC、一个内部转换时钟和一个多功能串行接口端口,还集成了一个低噪声、宽带宽、短孔径延迟的采样保持电路。在CNV上升沿,AD7942对IN+与IN-之间的模拟输入电压差进行采样,范围从0 V至VREF。基准电压(VREF)由外部提供,最高可设置为电源电压。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或5V逻辑兼容。AD7942采用10引脚MSOP或10引脚QFN (LFCSP)封装,其尺寸与8引脚MSOP或SOT-23封装相同,工作温度范围为−40°C至+85°C。

AD7942 特点
AD7942 技术指标
AD7942 应用领域
AD7942 建议配套产品
AD7942 功能框图

AD7942 芯片订购指南

产品型号 产品状态 封装 引脚 温度范围
AD7942BCPZRL 量产 10 ld LFCSP (3x3mm) 10 工业
AD7942BCPZRL7 量产 10 ld LFCSP (3x3mm) 10 工业
AD7942BRMZ 量产 10 ld MSOP 10 工业
AD7942BRMZ-RL7 量产 MICRO SOIC 10 工业
EVAL-AD7942CB 量产 评估板 10 工业
EVAL-AD7942CBZ 量产 评估板 10 工业
AD7942 应用技术支持与电子电路设计开发资源下载
  1. AD7942 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