Analog Devices Inc. AD7764BRUZ-REEL7

Overview

AD7764BRUZ-REEL7 from Analog Devices is a 24-bit, sigma-delta analog-to-digital converter (ADC) with on-chip differential amplifier and reference buffer, delivering 109 dB dynamic range at 312.5 kSPS, 115 dB at 78.125 kSPS, and full-band FIR filtering - designed for high-fidelity data acquisition in vibration analysis and instrumentation systems.

For engineers reviewing the AD7764BRUZ-REEL7 datasheet, AD7764BRUZ-REEL7 pinout, AD7764BRUZ-REEL7 application, or AD7764BRUZ-REEL7 equivalent, key selection considerations include decimation rate configuration (64×/128×/256×), dual power supply requirements (2.5 V/5 V), overrange alert functionality, and daisy-chain serial interface support for synchronized multi-channel sampling.

Technical Context

The AD7764BRUZ-REEL7 employs a fourth-order sigma-delta modulator sampling at up to 40 MSPS, followed by a full-band finite impulse response (FIR) filter with programmable decimation rates. Its on-chip differential amplifier provides 125 kHz bandwidth and common-mode output of 2.048 V, enabling direct interfacing with ±3.2768 V p-p differential inputs using a 4.096 V external reference.

It supports flexible SPI-compatible serial communication via SCO/FSO/SDO/SDI/FSI pins, includes SYNC for multi-device synchronization and PWRDWN for 1 mW power-down mode, and features digital gain correction registers and overrange status reporting - all operating across −40°C to +85°C in a 28-lead TSSOP package.

Key Specifications

Pinout & Package

AD7764BRUZ-REEL7 is housed in a 4.4 mm × 9.7 mm, 28-lead thin shrink small outline package (TSSOP) with exposed pad for thermal management. Pin assignments are validated per Analog Devices Rev. D datasheet Figure 5 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.

Compared with AD7764BRUZ-REEL7, AD7763BRUZ trades integrated buffering for higher speed, while AD7765BRUZ sacrifices speed for deeper dynamic range - making AD7764BRUZ-REEL7 the balanced choice for 312.5 kSPS vibration and instrumentation systems needing on-chip signal conditioning.

Availability

AD7764BRUZ-REEL7 is available at Aetrix Electronics and suitable for vibration analysis systems, portable instrumentation, industrial data acquisition modules, and condition monitoring nodes requiring stable component supply and long-term lifecycle support.

Supply support for AD7764BRUZ-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD7764BRUZ-REEL7 belongs to the AD776x family of precision sigma-delta ADCs engineered for high-speed, high-dynamic-range data acquisition where both ac fidelity and dc accuracy are critical - especially in sensor signal chains with minimal external components.

FAQ

What is the maximum output data rate of the AD7764BRUZ-REEL7?

The AD7764BRUZ-REEL7 achieves a maximum fully filtered output word rate of 312.5 kSPS when configured with 64× decimation and a 40 MHz master clock. This rate is derived from the formula [(MCLK/2)/decimation rate], and is confirmed in the Rev. D datasheet Table 2 and General Description section. The AD7764BRUZ-REEL7 maintains 109 dB dynamic range at this speed, making it suitable for high-bandwidth vibration analysis applications.

Does the AD7764BRUZ-REEL7 require an external reference voltage?

Yes, the AD7764BRUZ-REEL7 requires a precise 4.096 V external reference applied to the VREF+ pin. This reference sets the full-scale differential input range to ±3.2768 V with a 2.048 V common-mode bias. The device includes an on-chip reference buffer (powered by AVDD4), but does not integrate a voltage reference - confirmed in the General Description and Specifications sections of the Rev. D datasheet.

Can multiple AD7764BRUZ-REEL7 devices be synchronized?

Yes, the AD7764BRUZ-REEL7 supports deterministic multi-device synchronization via its dedicated SYNC pin. A falling edge on SYNC resets the internal digital filter state across all connected devices, enabling phase-aligned sampling. This capability is explicitly documented in the "Synchronization" subsection of the Rev. D datasheet and is essential for coherent multi-channel data acquisition systems using the AD7764BRUZ-REEL7.

What power supply voltages does the AD7764BRUZ-REEL7 require?

The AD7764BRUZ-REEL7 requires four independent supply rails: AVDD1 = 2.5 V (modulator), DVDD = 2.5 V (digital core), AVDD2/AVDD3/AVDD4 = 4.75 V to 5.25 V (analog general, differential amplifier, and reference buffer). These requirements are specified in Table 2 under "POWER REQUIREMENTS" and must be independently decoupled per the layout guidelines in the Rev. D datasheet.

Is the AD7764BRUZ-REEL7 pin-compatible with other AD776x series devices?

No, the AD7764BRUZ-REEL7 is not pin-compatible with other AD776x variants such as AD7763 or AD7765. While all share the 28-lead TSSOP package, pin functions differ - for example, AD7763 lacks the on-chip differential amplifier and thus assigns different roles to VINA+/VINA− pins. This is confirmed by comparing Pin Configuration tables across respective datasheets; substitution requires PCB redesign.