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ADIAD7768八路同时取样Σ-ΔADC解决方案
资料介绍
ADIAD7768八路同时取样2-AADC解决方案
ADI公司的AD7768是每路都集成了A调制器和数字滤波器的八路同时取样A模数转
换器（ADC），最大输入带宽110.8kHz时的动态范围108dB，INLppm，失调误差士50u增益误差30ppm，每路的ADC数据输出速率256kSPS，主要用在数据采集系统如USB/PXI/
以太网，仪器和工业控制回路，音频测试和测量，三相电源质量分析，声呐，高精度医疗
EEG/EMG/ECG以及振动和资产监测本文介绍了AD7768主要特性，功能框图，以及评估板EVAL-AD7768FMCZ主要特点，电路图，材料清单和PCB设计图.
The AD7768 is an 8-channel，simultaneous sampling A analog-to-digital converter
（ADC）with a M modulator and digital filter per chan nel，enabling synchronized sampling of ac and dc signals.
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| 文件名 | 大小 |
| ADIAD7768八路同时取样Σ-ΔADC解决方案.pdf | 4M |
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（完整内容请下载后查看）ADI AD7768 八路同时取样 Σ－Δ ADC 解决方案
ADI 公司的 AD7768 是每路都集成了 Σ-Δ调制器和数字滤波器的八路同时取样 Σ-Δ模数转
换器(ADC), 最大输入带宽 110.8kHz 时的动态范围 108dB, INL ±2 ppm, 失调误差 ± 50 μV增,
益误差 ±30 ppm, 每路的 ADC 数据输出速率 256 kSPS, 主要用在数据采集系统如
USB/PXI/
以太网 , 仪器和工业控制回路 ,音频测试和测量 , 三相电源质量分析 ,声呐 ,高精度医疗
EEG/EMG/ECG 以及振动和资产监测 .本文介绍了 AD7768 主要特性 ,功能框图 ,以及评估板
EVAL-AD7768FMCZ 主要特点 ,电路图 ,材料清单和 PCB 设计图 .
The AD7768 is an 8-channel, simultaneous sampling Σ-Δ analog -to-digital converter
(ADC) with a -ΣΔ modulator and digital filter per chan
nel, enabling synchronized sampling
of ac and dc signals.
The AD7768 achieves 108 dB dynamic range at a maximum input bandwidth of 110.8 kHz,
combined with typical performance
of ± 2ppm integral nonlinearity (INL),
μ± V50offset
error, and 3±0 ppm gain error.
The AD7768 user can trade off input bandwidth, output data rate, and power dissipation.
Select one of three power modes to optimize for noise targets and power consumption.
The flexibility of the AD7768 allows it to become a reusable platform for low power dc and
high performance ac measurement modules.
The AD7768 has three modes: fast mode (256 kSPS maximum, 110.8 kHz input
bandwidth, 51.5 mW per channel), median mode (128 kSPS maximum, 55.4 kHz input
bandwidth, 27.5 mW per channel) and eco mode (32 kSPS maximum, 13.8 kHz input
bandwidth, 9.375 mW per channel).
The AD7768 offers extensive digital filtering capabilities, such as a wideband, low
dB pass-band ripple, antialiasing low-pass filter with sharp roll off, and 105 dB attenuation
at the Nyquist frequency.
0.005
±
Frequency domain measurements can use the wideband linear phase filter. This filter has
a flat pass band (
0.0±05 dB ripple) from dc to 102.4 kHz at 256 kSPS, from dc to 51.2 kHz
at 128 kSPS, or from dc to 12.8 kHz at 32 kSPS.
The AD7768 also offers sinc response via a sinc5 filter, a low latency path for low
bandwidth, and low noise measurements.
The wideband and sinc5 filters can be selected and run on a per channel basis.
Within these filter options, the user can improve the dynamic range by selecting from
decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024. The ability to vary the
decimation filtering optimizes noise performance to the required input bandwidth.
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