AD7768-4BSTZ-RL7

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1. Describe

The AD7768-4BSTZ-RL7 are 8-channel and 4-channel simultaneous sampling Σ-Δ (Σ-Δ) analog-to-digital converters (ADCs) with Synchronous sampling of the signal. The AD7768-4BSTZ-RL7 achieve 108 dB dynamic range at a maximum input bandwidth of 110.8 kHz and have typical performance of ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error. AD7768-4BSTZ-RL7 users can trade off input bandwidth, output data rate, and power consumption, and choose from one of three power modes to optimize noise targets and power consumption. The flexibility of the AD7768-4BSTZ-RL7 makes it a reusable platform for low power dc and high performance ac measurement modules. The AD7768/AD7768-4 have three modes: fast mode, median mode, and low power mode. The AD7768-4BSTZ-RL7 offer extensive digital filtering features such as wideband, low ±0.005 dB passband ripple, antialiasing low-pass filter with sharp roll-off, and 105 dB attenuation at the Nyquist frequency. Frequency domain measurements can use wideband linear phase filters. The filter has a flat passband (±0.005 dB ripple) from dc to 102.4 kHz at 256 kSPS, dc to 51.2 kHz at 128 kSPS, or dc to 12.8 kHz at 32 kSPS. The AD7768-4BSTZ-RL7 also provide a sinc response through a sinc5 filter, a low latency path for low bandwidth and low noise measurements. Wideband and sinc5 filters can be selected and run on a per channel basis. Among these filter options, users can improve the dynamic range by selecting a decimation rate of ×32, ×64, ×128, ×256, ×512 and ×1024. The ability to vary the decimation filtering optimizes noise performance for the desired input bandwidth. Embedded analog functions on each ADC channel make design easier, such as pre-charged buffers on each analog input to reduce analog input current, pre-charged reference buffers on each channel to reduce input current and reference input terminals glitches.

2. FEATURES

    1. Precision ac and dc performance

    2. 8-/4-channel simultaneous sampling

        - 256 kSPS maximum ADC ODR per channel

        - 108 dB dynamic range

        - 110.8 kHz maximum input bandwidth (−3 dB BW)

        - −120 dB THD, typical

        - ±2 ppm of full-scale range (FSR) integral nonlinearity (INL), ±50 μV offset error, ±30 ppm gain error

    3. Optimized power dissipation vs. noise vs. input bandwidth 

        - Selectable power, speed, and input bandwidth

           - Fast (highest speed): 110.8 kHz BW, 51.5 mW per channel

           - Median (half speed): 55.4 kHz BW, 27.5 mW per channel

           - Low power (lowest power): 13.8 kHz BW, 9.375 mW per channel

        - Input BW range: dc to 110.8 kHz

        - Programmable input bandwidth/sampling rates

    4. CRC error checking on data interface

    5. Daisy-chaining

    6. Linear phase digital filter

        - Low latency sinc5 filter

        - Wideband brick wall filter: ±0.005 dB ripple to 102.4 kHz

    7. Analog input precharge buffers

    8. Power supply

        - AVDD1 = 5.0 V, AVDD2 = 2.25 V to 5.0 V

        - IOVDD = 2.5 V to 3.3 V or IOVDD = 1.8 V

    9. 64-lead LQFP package, no exposed pad

  10. Temperature range: −40°C to +105°C

3. APPLICATIONS

    1. Data acquisition systems: USB/PXI/Ethernet

    2. Instrumentation and industrial control loops

    3. Audio testing and measurement

    4. Vibration and asset condition monitoring

    5. 3-phase power quality analysis Sonar

    6. High precision medical electroencephalogram (EEG)/ electromyography (EMG)/electrocardiogram (ECG)