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Analog Devices Inc. AD4858 20-Bit 1MSPS Data Acquisition System (DAS) is a fully buffered, 8-channel simultaneous sampling DAS with differential, wide common-mode range inputs. Operating from a 5V low voltage supply, flexible input buffer supplies, and using the precision low drift internal reference and reference buffer, the AD4858 allows the SoftSpan range of each channel to be independently configured to match the native application signal swing, minimizing additional external signal conditioning. To further maximize the single-conversion dynamic range, the AD4858 incorporates seamless high dynamic range (SHDR) technology. When enabled, the input signal path gain of the channel is automatically optimized on a sample-by-sample basis, minimizing converter noise on each sample without impacting linearity.
The 11MHz bandwidth, picoamp input analog buffers, wide input common-mode range, and 120dB common-mode rejection ratio (CMRR) of the AD4858 allow the DAS to directly digitize input signals with arbitrary swings on INx+ and INx−. Its input signal flexibility, combined with ±160μV integral nonlinearity (INL), no missing codes at 20 bits, 97.2dB signal-to-noise ratio (SNR), and 111.4dB dynamic range (DR), make the AD4858 an ideal choice for applications requiring high accuracy, throughput, and precision in a compact solution footprint. Enabling 24-bit oversampling offers further SNR and dynamic range improvements. Optional per-channel offset, gain, and phase adjustment provide the ability to calibrate and remove system-level errors upstream to the DAS.
The Analog Devices Inc. AD4858 features a serial peripheral interface (SPI) register configuration bus (0.9V to 5.25V). It supports both low voltage differential signaling buses (LVDS) and complementary metal-oxidize semiconductor (CMOS) conversion data output buses, selectable using the LVDS/CMOS pin. Between one and eight lines of data output can be employed in CMOS mode, allowing the user to optimize bus width and throughput.
The 7.00mm × 7.00mm, 64-ball, ball grid array (BGA) of the AD4858 includes all critical power supply and reference bypass capacitors, minimizing full solution footprint and component count and reducing sensitivity to application printed circuit board (PCB) layout. It operates over an extended industrial temperature range of -40°C to +125°C.
