AD4855
Buffered, 8-Channel Simultaneous Sampling, 16-Bit 250 kSPS DAS
产品详情
- Complete 16-bit data acquisition system
- Simultaneous sampling of 8 internally buffered channels
- 250 kSPS per channel throughput
- Differential, wide common-mode range inputs
- ±75 pA typical input leakage at 25°C
- Full-scale input step settling time < 300 ns
- Integrated reference and reference buffer (4.096 V)
- Integrated supply decoupling capacitors
- 27 mW per channel at 250 kSPS, 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
- ±40 V, ±25 V, ±20 V, ±12.5 V, ±10 V, ±6.25 V, ±5 V, ±2.5 V
- 0 V to 40 V, 25 V, 20 V, 12.5 V, 10 V, 6.25 V, 5 V, 2.5 V
- Rail-to-rail input overdrive tolerance
- High performance
- INL: ±160 μV typical (±40 V range)
- SNR: 94.6 dB single-conversion typical (±40 V range)
- DR: 98.1 dB single-conversion typical (±40 V range)
- THD: −117 dB typical (±40 V range)
- CMRR: 120 dB typical
- Digital flexibility
- SPI CMOS (0.9 V to 5.25 V) and LVDS serial input and output
- Optional oversampling with 16-bit digital averaging
- Optional offset, gain, and phase correction
- 7.00 mm × 7.00 mm, 64-ball BGA full solution footprint
The AD4855 is a fully buffered, 8-channel simultaneous sampling, 16-bit, 250 kSPS data acquisition system (DAS) with differential, wide common-mode range inputs. Its functional architecture is shown in Figure 1. Operating from a 5 V low voltage supply, flexible input buffer supplies, and using the precision low drift internal reference and reference buffer, the AD4855 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 single-conversion dynamic range, the AD4855 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 11 MHz bandwidth, picoamp input analog buffers, wide input common-mode range, and 120 dB common-mode rejection ratio (CMRR) of the AD4855 allow the DAS to directly digitize input signals with arbitrary swings on INx+ and INx−. Its input signal flexibility, combined with ±160 μV integral nonlinearity (INL), no missing codes at 16 bits, 94.6 dB signal to noise ratio (SNR), and 98.1 dB dynamic range, make the AD4855 an ideal choice for applications requiring high accuracy, throughput, and precision in a compact solution footprint. Enabling 16-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 AD4855 features a serial peripheral interface (SPI) register configuration bus (0.9 V to 5.25 V) and supports both low voltage differential signaling buses (LVDS) and complementary metal-oxide 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 7.00 mm × 7.00 mm, 64-ball, ball grid array (BGA) of the AD4855 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. The device operates over an extended industrial temperature range of −40°C to +125°C.
Note that throughout this data sheet, multifunction pins such as LVDS/CMOS are referred to either by the entire pin name or by a single function of the pin. For example, LVDS when only that function is relevant.
Applications
- Automatic test equipment
- Avionics and aerospace
- Instrumentation and control systems
- Semiconductor manufacturing
- Test and measurement
参考资料
软件资源
Evaluation Software 2
Precision Toolbox for MATLAB
The Precision Toolbox is an evaluation software, made available in MATLAB, that allows configuring and capturing data with ADI’s precision data converters. To get started evaluating with the Precision Toolbox:
Step 1: Setup the evaluation hardware as described in the hardware setup guide.
Step 2: Install the Precision Toolbox and its dependencies. Refer to the Precision Toolbox wiki.
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硬件生态系统
| 部分模型 | 产品周期 | 描述 |
|---|---|---|
| Linear Regulators 3 | ||
| LT1761 | 推荐新设计使用 | 采用 SOT-23 封装的 100mA、低噪声、LDO 微功率稳压器 |
| ADP150 | 量产 | 超低噪声、150 mA CMOS线性调节器 |
| ADP151 | 量产 | 超低噪声 200 mA CMOS 线性稳压器 |
| 基准电压源 2 | ||
| LTC6655 | 量产 | 0.25ppm 噪声、低漂移、精准基准系列 |
| ADR4540 | 推荐新设计使用 | 超低噪声、高精度4.096V基准电压源 |
| 开关稳压器 2 | ||
| LT8330 | 推荐新设计使用 | 具 1A、60V 开关的低 IQ 升压 / SEPIC / 负输出转换器 |
| ADP5070 | 推荐新设计使用 |
具有独立正输出和负输出的1 A/0.6 A、DC-DC开关稳压器 |
工具及仿真模型
LTspice 1
设计工具 1
IBIS 模型 1
LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器，为改善模拟电路的仿真提供增强功能和模型。
评估套件
评估 AD4857 缓冲、8 通道同步采样、16 位 1 MSPS DAS
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