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RS – Low-noise analog front end for high-precision measurement applications (Analog Devices - AD7785)
Jul 16 2012 - Test & Measurement [More Test & Measurement Articles]A low-power, low-noise, complete analog front end for high-precision measurement applications, the Analog Devices AD7785, is now available from RS Components.
The AD7785 contains a low-noise 20-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 40nV when the update rate equals 4.17Hz.
The device contains a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2. The device can be operated with either the internal clock or an external clock.
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