The AD7942 is a 14-bit, charge redistribution, successive approximation PulSAR(R) 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(R) 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。
| 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 |