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ADI信号采集和振动分析的完整解决方案
AD7763 - Serial Interface, 625 kSPS, 24-Bit Sigma-Delta A/D Converter
产品描述
The AD7763 high performance, 24-bit, sigma delta analog to digital converter combines wide input
bandwidth and high speed with the benefits of sigma delta conversion, as well as performance of 106dB
SNR at 625 kSPS making it ideal for high speed data acquisition. A wide dynamic range combined with
significantly reduced anti-aliasing requirements simplifies the design process. An integrated buffer to
drive the reference, a differential amplifier for signal buffering and level shifting, an over-range flag,
internal gain & offset registers and a low-pass digital FIR filter make the AD7763 a compact highly
integrated data acquisition device requiring minimal peripheral component selection. In addition the
device offers programmable decimation rates and the digital FIR filter can be adjusted if the default
characteristics are not appropriate to the application. The AD7763 is ideal for applications demanding
high SNR without necessitating design of complex front end signal processing.
The differential input is sampled at up to 40MS/s by an analog modulator. The modulator output is
processed by a series of low-pass filters, the final one having default or user programmable coefficients.
The sample rate, filter corner frequencies and output word rate are set by a combination of the external
clock frequency and the configuration registers of the AD7763.
The reference voltage supplied to the AD7763 determines the analog input range. With a 4V reference,
the analog input range is ±3.2V differential biased around a common mode of 2V. This common mode
biasing can be achieved using the on-chip differential amplifiers, further reducing the external signal
conditioning requirements.
The AD7763 is available in an exposed paddle 64-lead TQFP and 48-lead CSP packages and is
specified over the industrial temperature range from -40°C to +85°C.
Applications
Data acquisition systems
Vibration analysis
Instrumentation
下面是AD7763 评估板的电路原理图:
AD776xEB评估板电路图
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AD7763 数据表
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下面是AD7763 的应用手册连接:
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP) (pdf,
449,584 bytes)
AN-389: Using Sigma-Delta Converters-Part 2 (pdf, 604,532 bytes)
When to Use/How to Use Sigma-Delta ADCs; Continuation of Part 1 Discussion.
AN-388: Using Sigma-Delta Converters-Part 1 (pdf, 604,216 bytes)
When to Use/How to Use Sigma-Delta ADCs
AN-354: Ask the Applications Engineer 1-Multi Troubles (pdf, 164,444 bytes)
Addresses problems often encountered with LOG Circuits, Time Division Analog Multiplexing, and ADC
Power Strobing
AN-342: Analog Signal-Handling for High Speed and Accuracy. (pdf, 479,545 bytes)
Signal handling techniques for optimizing DAC and ADC performance.
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging (pdf, 222,927
bytes)
AN-283: Sigma-Delta ADCs and DACs (pdf, 1,740,324 bytes)
Overview of Sigma-Delta Concepts: Oversampling, Noise Shaping Using the Sigma-Delta Modulator,
Digital Filtering and Decimation.
AN-282: Fundamentals of Sampled Data Systems (pdf, 2,182,923 bytes)
AN-280: Mixed Signal Circuit Technologies (pdf, 2,152,032 bytes)
Considers problems which arise when reality (& Murphy) intervene in a design which otherwise seems
satisfactory in terms of theory and modeling.
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