Analog Devices Inc. 亚德诺半导体 AD7988-x 16 位超低功率模数转换器

亚德诺半导体 AD7988-x 16 位超低功率模数转换器(ADC)是一款逐次逼近型 ADC，采用单电源 VDD 供电。AD7988-1 提供 100kSPS 吞吐率，而 AD7988-5 提供 500kSPS 吞吐率。这些低功率、16 位采样 ADC 具有多功能串行端口。通过 SPI 兼容串行接口，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。采用独立电源 VIO 时，AD7988-1 及 AD7988-5 可与 1.8V、2.5V、3V 和 5V 逻辑兼容。在 CNV 上升沿，AD7988 对范围为 0V 至 REF 的 IN+_REF 与参考地 IN− 之间的模拟输入电压进行采样。基准电压(REF)由外部提供，设计人员可以独立于电源电压(VDD)进行设定。AD7988-1/AD7988-5 ADC 采用 10 引脚 MSOP 或 10 引脚 LFCSP (QFN) 封装，工作于 −40°C 到 +125°C 的温度。这些器件非常适合电池供电设备、低功耗数据采集系统、便携式医疗器械、ATE 设备、数据采集、通信等应用。

These low-power, 16-bit sampling ADCs feature a versatile serial interface port. The SPI-compatible serial interface offers the ability to daisy-chain several ADCs on a single 3-wire bus using the SDI input. AD7988-1 and AD7988-5 are compatible with 1.8V, 2.5V, 3V, or 5V logic using the separate supply, VIO.

On the CNV rising edge, the AD7988 ADCs sample an analog input, IN+, between 0V to VREF with respect to a ground sense, IN−. The reference voltage, REF, is applied externally and designers can set it independent of the supply voltage, VDD. The AD7988-1/AD7988-5 ADCs are housed in a 10-lead MSOP or a 10-lead LFCSP (QFN) and operate from −40°C to +125°C.

These devices are well-suited for battery-powered equipment, low-power data acquisition systems, portable medical instruments, ATE equipment, data acquisitions, and communications.

特性

Low power dissipation
- AD7988-1
  - 400μW at 100kSPS (VDD only)
  - 700μW at 100kSPS (total)
- AD7988-5
  - 2mW at 500kSPS (VDD only)
  - 3.5mW at 500kSPS (total)
16-bit resolution with no missing codes
Throughput: 100kSPS/500 kSPS options
INL: ±0.6LSB typical, ±1.25LSB maximum
SINAD: 91.5dB at 10kHz
THD: −114dB at 10kHz