资 源 简 介
The AD7763 high performance， 24-bit， Σ-Δ analog-to-digital converter （ADC） combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion， as well as performance of 107 dB SNR at 625 kSPS， making it ideal for high speed data acquisiTIon. A wide dynamic range， combined with significantly reduced anTIaliasing requirements， simplifies 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 AD7763 a compact， highly integrated data acquisition device requiring minimal peripheral component selection. In addition， the device offers programmable decimation rates and a digital FIR filter， which can be userprogrammed to ensure that its characteristics are tailored for the user’s application. The AD7763 is ideal for applications demanding high SNR without necessitating the design of complex， frontend signal processing. 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， 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 AD7763. The reference voltage supplied to the AD7763 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 amplifiers， further reducing the external signal conditioning requirements. The AD7763 is available in an exposed paddle， 64-lead TQFP_EP and is specified over the industrial temperature range from −40°C to +85°C.
