AD7763 串行接口、625 kSPS、24位Σ-Δ型ADC

AD7763: 串行接口、625 kSPS、24位Σ-Δ型ADC

AD7763是一款高性能、24位Σ-Δ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,625 kSPS时信噪比可达106 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。AD7763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。AD7763是要求高信噪比（SNR）且无需要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 MS/s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AD7763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AD7763采用的基准电压。当基准电压为4V时,模拟输入范围为基于2V共模电压的±3.2V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。AD7763采用64引脚裸露焊盘TQFP和48引脚CSP两种封装,额定温度范围为-40°C至+85°C工业温度范围。

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.

AD7763 特点

78 kHz输出数据速率时,信噪比（SNR）
为118 dB
625 kHz输出数据速率时,信噪比（SNR）为106 dB
最大完全滤波输出字速率：625 kHz
可编程过采样率（32×～256×）
灵活的串行接口
片内差动放大器,用于信号缓冲
全差分调制器输入
低通FIR滤波器,具有默认的或用户可编程系数
超量程提醒位
数字偏置与增益校正寄存器
低功耗和省电模式
多器件通过SYNC引脚实现同步
118 dB SNR at 78 kHz output data rate
106 dB SNR at 625 kHz output data rate
625 kHz maximum fully filtered output word rate
Programmable over-sampling rate (32x to 256x)
Flexible serial interface
On-chip differential amplifier for signal buffering
Fully differential modulator input
Low pass FIR filter with default or user programmable coefficients
Over-range alert bit
Digital offset and gain correction registers
Low power and power down modes
Synchronization of multiple devices via SYNC pin

AD7763 技术指标

Resolution (Bits): 24bit
# Chan: 1
Sample Rate: 40MSPS
Interface: I2S,Ser
Analog Input Type: Diff-Bip
Ain Range: 4 V p-p,6.5 V p-p
ADC Architecture: Sigma-Delta
Pkg Type: QFP

AD7763 应用领域

数据采集系统
振动分析
仪器仪表

AD7763 功能框图

AD7763 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
AD7763BSVZ 产品状态: 量产	64 lead TQFP_EP (pad size 7.50mm)	64	工业	Tray, 160	$ 19.02	$ 15.10	是
AD7763BSVZ-REEL 产品状态: 量产	64 lead TQFP_EP (pad size 7.50mm)	64	工业	Reel, 1500	-	$ 15.10	是
EVAL-AD7763EDZ 产品状态: 量产	评估板	-		1	$ 150.00	$ 150.00	是