Analog Devices Inc. AD4856 8-Ch Data Acquisition System (DAS)
Analog Devices AD4856 8-Ch Data Acquisition System (DAS) offers differential, wide common-mode range inputs and combines seamless high dynamic range (SHDR) technology. The fully buffered, 8-channel simultaneous sampling, 20-bit, 250kSPS DAS operates from a 5V low voltage supply with flexible input buffer supplies and implements the precision low drift internal reference and reference buffer. These features facilitate the SoftSpan range of each channel to be independently configured to match the native application signal swing, minimizing additional external signal conditioning. The AD4856 incorporates seamless high dynamic range (SHDR) technology to further maximize the single-conversion dynamic range. 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 ADI AD4856 DAS incorporates all critical power supply and reference bypass capacitors into a 7.00mm × 7.00mm, 64-ball, ball grid array (BGA) package. The device's complete solution footprint and component count are minimized, and sensitivity to application printed circuit board (PCB) layout is reduced. The AD4856 functions over an extended industrial temperature range of -40°C to +125°C.
Features
- Complete 20-bit data acquisition system
- Simultaneous sampling of 8 internally buffered channels
- 250kSPS per channel throughput
- Differential, wide common-mode range inputs
- ±75pA typical input leakage at 25°C
- Full-scale input step settling time <300ns
- Integrated reference and reference buffer (4.096V)
- Integrated supply decoupling capacitors
- 27mW per channel at 250kSPS, scales with throughput
- Minimal external signal conditioning
- Seamless high dynamic range
- Per sample, per channel automatic gain ranging
- Maintains ppm-level INL
- Per channel SoftSpan input ranges, bipolar or unipolar
- ±40V, ±25V, ±20V, ±12.5V, ±10V, ±6.25V, ±5V, ±2.5V
- 0V to 40V, 25V, 20V, 12.5V, 10V, 6.25V, 5V, 2.5V
- Rail-to-rail input overdrive tolerance
- High performance
- INL at ±160μV typical (±40V range)
- NR at 97.2dB single-conversion typical (±40V range)
- DR at 111.4dB single-conversion typical (±40V range)
- THD at -117dB typical (±40V range)
- CMRR at 120dB typical
- Digital flexibility
- SPI CMOS (0.9V to 5.25V) and LVDS serial input and output
- Optional oversampling with 24-bit digital averaging
- Optional offset, gain, and phase correction
- 7.00mm × 7.00mm, 64-ball BGA full solution footprint
Applications
- Automatic test equipment
- Avionics and aerospace
- Instrumentation and control systems
- Semiconductor manufacturing
- Test and measurement
Functional Block Diagram
Opublikowano: 2024-10-21
| Zaktualizowano: 2024-11-06