AD7705BN Datasheet PDF - Analog Devices

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Part NameAD7705BN

Description3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs

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page32 Pages

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MFG CO.ADAnalog Devices

GENERAL DESCRIPTIONThe AD7705/AD7706 are complete analog front ends for low frequency measurement applications. These two-/three-channel devices can accept low level input signals directly from a transducer and produce a serial digital output. They employ a sigma-delta 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.

FEATURES AD7705: Two Fully Differential Input Channel ADCs AD7706: Three Pseudo Differential Input Channel ADCs 16 Bits No Missing Codes 0.003% Nonlinearity Programmable Gain Front End Gains from 1 to 128 Three-Wire Serial Interface SPI™, QSPI™, MICROWIRE™ and DSP Compatible Schmitt Trigger Input on SCLK Ability to Buffer the Analog Input 2.7 V to 3.3 V or 4.75 V to 5.25 V Operation Power Dissipation 1 mW max @ 3␣ V Standby Current 8 mA max 16-Lead DIP, 16-Lead SOIC and TSSOP Packages

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