ad7767高性能24位采样SAR模数转换器

　　The AD7767/AD7767-1/AD7767-2 are high performance， 24-bit， oversampled SAR analog-to-digital converters （ADCs）。 The AD7767/AD7767-1/AD7767-2 combine the benefits of a large dynamic range and input bandwidth， consuming 15 mW， 10.5 mW， and 8.5 mW power， respectively， and are contained in a 16-lead TSSOP package. Ideal for ultralow power data acquisition （such as PCI- and USB-based systems）， the AD7767/AD7767-1/AD7767-2 provide 24-bit resolution. The combination of exceptional SNR， wide dynamic range， and outstanding dc accuracy make the AD7767/AD7767-1/AD7767-2 ideally suited for measuring small signal changes over a wide dynamic range. This is particularly suitable for applications where small changes on the input are measured on larger ac or dc signals. In such an application， the AD7767/AD7767-1/AD7767-2 accurately gather both ac and dc information. The AD7767/AD7767-1/AD7767-2 include an on-board digital filter （complete with linear phase response） that acts to eliminate out-of-band noise by filtering the oversampled input voltage. The oversampled architecture also reduces front-end antialias requirements. Other features of the AD7767 include a SYNC/PD （synchronization/power-down） pin， allowing the synchronization of multiple AD7767 devices. The addition of an SDI pin provides the option of daisy chaining multiple AD7767 devices. The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply using a 5 V reference. The devices operate from −40°C to +105°C.