AD7760: 24位、2.5 MSPS、100 dB Σ-Δ型ADC,内置片内缓冲
AD7760是一款高性能、24位Σ-Δ型模数转换器（ADC）,融合了宽输入带宽、高速特性与Σ-Δ转换技术的优势,2.5 MSPS时信噪比可达100 dB,因此非常适合高速数据采集应用。宽动态范围以及显著降低的抗混叠要求,使设计过程得以简化。AD7760内置用来驱动基准电压的缓冲、用于信号缓冲和电平转换的差动放大器、超量程标志、内部增益与失调寄存器以及低通数字FIR滤波器,是一款高度集成的紧凑型数据采集器件,只需选择极少的外围元件。此外,该器件提供可编程抽取率,而且如果数字FIR滤波器的默认特征不适合应用要求,还可对其进行调整。AD7760是要求高信噪比（SNR）且无需采用复杂的前端信号处理设计应用的理想器件。
差分输入由模拟调制器以最高40 MSPS的采样速率进行采样。调制器输出由一系列低通滤波器处理,最后一个滤波器具有默认的或用户可编程系数。采样速率、滤波器转折频率和输出字速率由AD7760的外部时钟频率与配置寄存器共同设置。模拟输入范围取决于AD7760采用的基准电压。当基准电压为4 V时,模拟输入范围为基于2 V共模电压的±3.2 V差分偏置电压。此共模偏置可利用片内差分放大器来实现,从而可进一步降低外部信号调理要求。AD7760采用64引脚裸露焊盘TQFP封装,额定温度范围为−40°C至+85°C工业温度范围。
The AD7760 is a high performance, 24-bit Σ-Δ analog-to-digital converter (ADC). It combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion to achieve a performance of 100 dB SNR at 2.5 MSPS, making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced antialiasing requirements simplify the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an overrange flag, internal gain and offset registers, and a low-pass digital FIR filter make the AD7760 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 for the application. The AD7760 is ideal for applications demanding high SNR without a complex front-end signal processing design.
The differential input is sampled at up to 40 MSPS by an analog modulator. The modulator output is processed by a series of low-pass filters, with the final filter 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 AD7760.
The reference voltage supplied to the AD7760 determines the analog input range. With a 4 V reference, the analog input range is ±3.2 V differential biased around a common mode of 2 V. This common-mode biasing can be achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.The AD7760 is available in an exposed paddle, 64-lead TQFP and is specified over the industrial temperature range from −40°C to +85°C.
AD7760 特点
- 78 kHz输出数据速率时,动态范围为120 dB
- 2.5 MHz输出数据速率时,动态范围为100 dB
- 78 kHz输出数据速率时,信噪比（SNR）为112 dB
- 2.5 MHz输出数据速率时,信噪比（SNR）为100 dB
- 最大完全滤波输出字速率：2.5 MHz
- 全差分调制器输入
- 可编程过采样率（8×～256×）
- 片内差分放大器,用于信号缓冲
- 低通有限脉冲响应（FIR）滤波器,具有默认的或用户可编程系数
- 调制器输出模式
- 超量程提醒位
- 数字偏置与增益校正寄存器
- 120 dB dynamic range at 78 kHz output data rate
- 100 dB dynamic range at 2.5 MHz output data rate
- 112 dB SNR at 78 kHz output data rate
- 100 dB SNR at 2.5 MHz output data rate
- 2.5 MHz maximum fully filtered output word rate
- Fully differential modulator input
- Programmable oversampling rate (8X to 256X)
- On-chip differential amplifier for signal buffering
- Low-pass finite impulse response (FIR) filter with default or user
- programmable coefficients
- Modulator output mode
- Overrange alert bit
- Digital offset and gain correction registers
AD7760 技术指标
- Resolution (Bits): 24bit
- # Chan: 1
- Sample Rate: 40MSPS
- Interface: Par
- Analog Input Type: Diff-Uni
- Ain Range: 4 V p-p,6.5 V p-p
- ADC Architecture: Sigma-Delta
- Pkg Type: QFP
AD7760 应用领域
- 数据采集系统
- 振动分析
- 仪器仪表
- Data acquisition systems
- Vibration analysis
- Instrumentation
AD7760 建议配套产品
- 推荐AD7760使用的驱动放大器
- 推荐AD7760使用的基准电压源
- 推荐电源解决方案
- 欲选择电压调节器产品，请使用ADIsimPower。
- 欲选择电源监控器产品，请使用电源监控器参数搜索。
AD7760 功能框图
AD7760 芯片订购指南
| 产品型号 | 封装 | 引脚 | 温度范围 | 包装和数量 | 报价*(100-499) | 报价*1000 pcs | RoHS |
|---|---|---|---|---|---|---|---|
| AD7760BSVZ 产品状态: 量产 | 64 lead TQFP_EP (10x10mm w/6mm ep) | 64 | 工业 | Tray, 160 | $ 31.37 | $ 24.90 | 是 |
| AD7760BSVZ-REEL 产品状态: 量产 | 64 lead TQFP_EP (10x10mm w/6mm ep) | 64 | 工业 | Reel, 1500 | - | $ 24.90 | 是 |
| EVAL-AD7760EDZ 产品状态: 量产 | 评估板 | 64 | 工业 | 1 | $ 150.00 | $ 150.00 | 是 |
AD7760 应用技术支持与电子电路设计开发资源下载
- AD7760 数据手册DataSheet下载 .PDF
- AD7760 评估版资料下载 .PDF
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
- ADC模数转换器选型指南 . PDF