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AD7765

Analog Devices
Part Number AD7765
Manufacturer Analog Devices
Description 112 dB Sigma-Delta ADC
Published Jan 17, 2007
Detailed Description www.DataSheet4U.com Preliminary Technical Data FEATURES High performance 24-bit Sigma-Delta ADC 112dB SNR at 78kHz outp...
Datasheet PDF File AD7765 PDF File

AD7765
AD7765

Overview
www.
DataSheet4U.
com Preliminary Technical Data FEATURES High performance 24-bit Sigma-Delta ADC 112dB SNR at 78kHz output data rate 109dB SNR at 156 kHz output data rate 156 kHz maximum fully filtered output word rate Pin-selectable over-sampling rate (128x & 256x) Flexible SPI serial interface Fully differential modulator input On-chip differential amplifier for signal buffering On-chip Reference Buffer Low pass FIR filter Over-range alert pin Digital gain correction registers Power down mode Synchronization of multiple devices via SYNC pin Daisy Chaining 24-Bit, 156 kSPS,112dB Σ∆ ADC, With On-Chip Buffers, Serial Interface AD7765 FUNCTIONAL BLOCK DIAGRAM VOUTA- VOUTA+ VIN+ VINMCLK AVDD1 DIFF Multi-Bit Sigma-Delta Modulator AVDD2 AVDD3 AVDD4 DVDD Reconstruction OVERRANGE VINA+ VINAVREF+ + BUF _ REFGND AD7765 SYNC RESET/PWRDN Interface Logic and Offset & Gain Correction Registers Decimation FIR Filter Engine DECAP RBIAS SCO SDI SDO FSO Figure 1.
APPLICATIONS Data acquisition systems Vibration analysis Instrumentation PRODUCT OVERVIEW The AD7765 high performance, 24-bit, sigma delta analog to digital converter combines wide input bandwidth, high speed and performance of 112dB at a 156Khz output data rate with the benefits of sigma delta conversion, while, also offering excellent DC specifications which make the converter ideal for high speed data acquisition of AC signals where DC data is also a requirement.
A wide dynamic range combined with significantly reduced anti-aliasing requirements simplifies the design process.
The AD7765 offers pin-selectable decimation rates of 128x and 256x.
Other features include an integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting.
The addition of an internal gain register, an over-range alert pin, and a low-pass digital FIR filter make the AD7765 a compact highly integrated data acquisition device requiring minimal peripheral component selection.
The AD7765 is id...


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