AD7760 Datasheet | Analog Devices

FEATURES High performance 20-bit Sigma-Delta ADC 118d B SNR at 78k Hz output data rate 100d B SNR at 2.5MHz output data rate 2.5 MHz maximum fully filtered output word rate Programmable over-sampling rate (8x to 256x) Flexible parallel interface Fully differential modulator input On-chip differential amplifier for signal buffering Low pass FIR filter with default or user programmable coefficients Over-range alert bit Digital offset and gain correction registers Filter bypass modes Low power and power down modes Synchronization of multiple devices via SYNC pin VIN- VIN+ FUNCTIONAL BLOCK DIAGRAM AVDD1 AVDD2 AVDD3 AVDD4 DECAP RBIAS AGND Programmable Decimation Control Logic, I/O and Registers FIR Filter Engine VDRIVE DVDD DGND DIFF VREF+ + BUF - Multi-Bit Sigma-Delta Modulator Reconstruction MCLK MCLK SYNC RESET RD/WR DRD Y DB0 - DB15 Figure 1. APPLICATIONS Data acquisition systems Vibration analysis Instrumentation Data Shee . PRODUCT OVERVIEW The AD7760 high performance 20-bit sigma delta analog to digital converter bines wide input bandwidth and high speed with the benefits of sigma delta conversion with performance of 100d B SNR at 2.5MSPS making it ideal for high speed data acquisition. Wide dynamic range bined with significantly reduced anti-aliasing requirements simplify 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 AD7760 a pact highly integrated data acquisition device requiring minimal peripheral ponent 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 AD7760 is ideal for applications demanding high SNR without necessitating design of plex front end signal processing. The differential input is sampled at up to 40MS/s...