AD7705_7706

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  The AD7705/AD7706 are complete analog front ends for low

  frequency measurement applications. These 2-/3-channel devices

  can accept low level input signals directly from a transducer and

  produce serial digital output. The devices employ a Σ-Δ

  conversion technique to realize up to 16 bits of no missing codes

  performance. The selected input signal is applied to a

  proprietary, programmable-gain front end based around an

  analog modulator. The modulator output is processed by an onchip digital filter. The first notch of this digital filter can be programmed via an on-chip control register, allowing adjustment of

  the filter cutoff and output update rate.

  The AD7705/AD7706 devices operate from a single 2.7 V to

  3.3 V or 4.75 V to 5.25 V supply. The AD7705 features two fully

  differential analog input channels; the AD7706 features three

  pseudo differential input channels.

  Both devices feature a differential reference input. Input signal

  ranges of 0 mV to 20 mV through 0 V to 2.5 V can be

  incorporated on both devices when operating with a VDD of 5 V

  and a reference of 2.5 V. They can also handle bipolar input

  signal ranges of ±20 mV through ±2.5 V, which are referenced to

  the AIN(−) inputs on the AD7705 and to the COMMON input

  on the AD7706.

AD7705_7706

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  • llsluoluo33 2018-06-25

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