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Analog Devices Inc. AD7761 同步采样 ADC

Analog Devices AD7761 是一款每通道具有一个 Σ-Δ 调制解调器和数字滤波器的 8 通道同步采样 Σ-Δ 模数转换器 (ADC)。 该 ADC 可实现交流和直流信号的同步采样。 AD7761 ADC 在 110.8kHz 最大输入带宽下实现 97.7dB 动态范围，具有 ±1LSB 积分非线性 (INL)、±1LSB 失调误差和 ±5LSB 增益误差。 AD7761 有三种工作模式。 快速模式提供每通道最大 256kSPS 输入数据速率、110.8kHz 输入带宽以及每通道 51.5mW 功率。 AD7761 的中速模式提供每通道最大 128kSPS 输入数据速率、55.4kHz 输入带宽以及每通道 27.5mW 功率。 而聚焦模式提供每通道最大 32kSPS 输出数据速率、13.8kHz 输入带宽以及每通道 9.375mW 功率。 AD7761 提供丰富的数字滤波性能，如宽带、±0.005dB 低通带纹波、集成急剧滚降性能的抗混叠低通滤波器，以及在奈奎斯特频率下的 105dB 衰减。

The AD7761 features three modes. The fast mode delivers a 256kSPS maximum output data rate per channel, 110.8kHz input bandwidth, and 51.5mW per channel. AD7761’s median mode has 128kSPS maximum output data rate per channel, 55.4kHz input bandwidth, and 27.5mW per channel. While the focus mode provides 32kSPS maximum output data rate per channel, 13.8kHz input bandwidth, and 9.375mW per channel. The AD7761’s extensive digital filtering capabilities include a wideband, low ±0.005dB pass-band ripple, anti-aliasing low-pass filter with sharp roll-off, and 105dB attenuation at the Nyquist frequency.

特性

  • Precision AC and DC performance
  • 8-channel simultaneous sampling
    • 256kSPS ADC output data rate per channel
    • 97.7dB dynamic range
    • 110.8kHz input bandwidth (−3dB bandwidth (BW))
    • –120dB THD, typical
    • ±1LSB INL, ±1LSB offset error, ±5LSB gain error
  • Optimized power dissipation vs. noise vs. input bandwidth
  • Selectable power, speed, and input bandwidth
    • Fast: highest speed; 110.8kHz BW, 51.5mW per channel
    • Median: half-speed, 55.4kHz BW, 27.5mW per channel
    • Focus: lowest power, 13.8kHz BW, 9.375mW per channel
  • Input BW range: DC to 110.8kHz
  • Programmable input bandwidth/sampling rates
  • Cyclic redundancy check (CRC) error checking on data interface
  • Daisy-chaining
  • Linear phase digital filter
    • Low latency sinc5 filter
    • Wideband brick wall filter: ±0.005dB ripple to 102.4kHz
  • Analog input precharge buffers
  • Power supply
    • AVDD1 = 5 V, AVDD2 = 2.25V to 5.0V
    • IOVDD = 2.5V to 3.3 V or IOVDD = 1.8V
  • 64-lead LQFP package, no exposed pad
  • Temperature range: −40°C to +105°C

应用

  • Data acquisition systems: USB/PXI/Ethernet
  • Instrumentation and industrial control loops
  • Audio test and measurement
  • Vibration and asset condition monitoring
  • 3-phase power quality analysis
  • Sonar
  • High precision medical electroencephalogram (EEG)/ electromyography (EMG)/electrocardiogram (ECG)

Functional Block Diagram

框图 - Analog Devices Inc. AD7761 同步采样 ADC

Analog Devices EVAL-AD7761FMCZ Evaluation Board helps designers evaluate the features and capabilities of the AD7761 Simultaneous Sampling ADCs.

发布日期: 2016-10-24 | 更新日期: 2022-03-11