AD7765

PRODUCTION

24-Bit, 156 kSPS, 112 dB Sigma-Delta ADC with On-Chip Buffers and Serial Interface

Data Sheet (Rev. D) Product Selection Table

Part Models: 2
1ku List Price: Starting From $10.85

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Overview

High performance 24-bit Σ-Δ ADCC: wide input bandwidth with excellent dc specifications
115 dB dynamic range at 78.125 kHz output data rate
112 dB dynamic range at 156 kHz output data rate
156 kHz maximum fully filtered output word rate
Pin-selectable oversampling rates of 128× and 256×
Low power mode without reducing available input bandwidth
Flexible serial peripheral interface (SPI)
Fully differential modulator input

On-chip differential amplifier for signal buffering
On-chip reference buffer
Full band low-pass finite impulse response (FIR) filter
Overrange alert pin
Digital gain correction registers
Power-down mode
Synchronization of multiple devices via the SYNC pin
Daisy chaining
Power supply: 2.5 V and 5 V
External reference: 4.096 V
Operating temperature range: −40°C to +85°C
Available in 4.4 mm × 9.7 mm, 28-lead TSSOP

The AD7765 is a high performance, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). It combines wide input bandwidth, high speed, and performance of 112 dB dynamic range at a 156 kHz output data rate. With excellent dc specifications, the converter is ideal for high speed data acquisition of ac signals where dc data is also required.

Using the AD7765 eases front-end antialias filtering requirements, simplifying the design process significantly. The AD7765 offers pin-selectable decimation rates of 128× and 256×. Other features include an integrated buffer to drive the reference, as well as a fully differential amplifier to buffer and level shift the input to the modulator.

An overrange alert pin indicates when an input signal exceeds the acceptable range. The addition of internal gain and internal overrange registers makes the AD7765 a compact, highly integrated data acquisition device requiring minimal peripheral components.

The AD7765 also offers a low power mode, significantly reducing power dissipation without reducing the output data rate or available input bandwidth.

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 external clock frequency applied to the AD7765 determines the sample rate, filter corner frequencies, and output word rate.

The AD7765 device boasts a full band on-board FIR filter. The full stop-band attenuation of the filter is achieved at the Nyquist frequency. This feature offers increased protection from signals that lie above the Nyquist frequency being aliased back into the input signal bandwidth.

The reference voltage supplied to the AD7765 determines the input range. With a 4.096 V reference, the analog input range is ±3.2768 V differential, biased around a common mode of 2.048 V. This common-mode biasing is achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.

The AD7765 is available in a 28-lead TSSOP package and is specified over the industrial temperature range of −40°C to +85°C.

APPLICATIONS

Data acquisition systems
Vibration analysis
Instrumentation

Part Models: 2
1ku List Price: Starting From $10.85

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD7765BRUZ	28-Lead TSSOP (4.4mm x 9.7mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD7765BRUZ-REEL7	28-Lead TSSOP (4.4mm x 9.7mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 5, 2021 - 21_0035 Amkor Philippines as an Alternate Site for TSSOP_4.4
		PCN21_0035_Form Material_Report Qualification Results Summary Other
AD7765BRUZ	PRODUCTION
AD7765BRUZ-REEL7	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 1

AD7764/AD7765 Evaluation Board Software

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Tools & Simulations

Sigma-Delta ADC Tutorial

An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

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Evaluation Kits

AD7764/AD7765 Evaluation Kit

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Product Details

The EVAL-AD7764EDZ / EVAL-AD7765EDZ are fully featured evaluation kits for the AD7764 / AD7765. These boards operate in stand alone mode or in conjunction with the Converter Evaluation and Development board, EVAL-CED1Z . When operated with the Converter Evaluation and Development board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation boards in standalone operation or when operated with the Converter Evaluation and Development board.

Please note: This Evaluation software does not run on Windows 8 or Windows 10 (USB driver is non-compliant with OS >Windows 7).