Analog Devices Inc. AD7829BRUZ

Overview

AD7829BRUZ from Analog Devices is an 8-bit, 2 MSPS, 8-channel parallel-output analog-to-digital converter (ADC) with on-chip 2.5 V reference, track-and-hold amplifier, and automatic power-down. It operates from single 3 V ±10% or 5 V ±10% supply, delivers 420 ns conversion time, and supports 0 V to 2.5 V p-p input range at 5 V supply - used in high-speed DSP front ends and disk drive data acquisition.

For engineers reviewing the AD7829BRUZ datasheet, AD7829BRUZ pinout, AD7829BRUZ application, or AD7829BRUZ equivalent, key selection criteria include channel count (8 single-ended), conversion speed (2 MSPS), supply flexibility (3 V/5 V), SNR (48 dB min at 30 kHz), and parallel interface timing compatibility with microcontrollers such as 8051 and ADSP-21xx.

Technical Context

The AD7829BRUZ implements a half-flash ADC architecture: a 4-bit flash stage provides MSBs, followed by a second flash stage for LSBs, achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input in ≤200 ns and supports full-power bandwidth up to 10 MHz, enabling subsampling of RF and IF signals.

Channel selection is performed via three address inputs (A0–A2), independent of data bus activity. The CONVST pin serves dual function - initiating conversion on its falling edge and triggering automatic power-down when sampled low at EOC assertion - eliminating need for separate control logic in low-duty-cycle applications.

Key Specifications

Pinout & Package

AD7829BRUZ is housed in a 28-lead TSSOP package (RUZ suffix), 4.4 mm × 9.7 mm body, 0.65 mm pitch, thermally enhanced for industrial environments. Pin 1 marked by dot; exposed pad (EP) connected to AGND for optimal thermal and noise performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, high-speed ADC applications.

Compared with AD7825BRUZ, AD7829BRUZ adds four extra analog inputs and one address line (A2), enabling direct expansion to eight channels without redesign. Against MAX1186EEE+, AD7829BRUZ offers parallel interface simplicity, integrated reference, and on-chip track-and-hold - critical for deterministic timing in real-time control loops.

Availability

AD7829BRUZ is available at Aetrix Electronics and suitable for disk drive read channel design, portable spectrum analyzer development, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7829BRUZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The AD782x family was designed specifically for high-speed, low-latency data acquisition in real-time embedded systems - emphasizing minimal conversion overhead, flexible supply operation, and seamless microprocessor/DSP integration via parallel interfaces.

FAQ

What is the maximum sampling rate supported by the AD7829BRUZ?

The AD7829BRUZ supports a maximum throughput of 2 MSPS (2 million samples per second), with a guaranteed maximum conversion time of 420 ns. This rate is achievable across the full industrial temperature range (−40°C to +85°C) when operated within specified supply (3 V ±10% or 5 V ±10%) and reference conditions. The AD7829BRUZ maintains this performance without requiring external clock dividers or timing compensation circuits.

Does the AD7829BRUZ require an external reference voltage?

No, the AD7829BRUZ does not require an external reference voltage because it integrates a 2.5 V on-chip reference with ±2% initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected for internal reference use, or configured to accept an external 2.5 V source for higher precision. Using the internal reference eliminates BOM cost and layout area typically needed for external reference ICs like the AD780.

How many analog input channels does the AD7829BRUZ have, and how are they selected?

The AD7829BRUZ has eight single-ended analog input channels (VIN1 through VIN8). Channel selection is performed using three dedicated address inputs - A0, A1, and A2 - which are sampled synchronously with the RD signal. No internal register programming or serial configuration is required, enabling direct hardware-based channel sequencing in FPGA or microcontroller designs interfacing with the AD7829BRUZ.

What power-saving features does the AD7829BRUZ offer?

The AD7829BRUZ implements automatic power-down triggered by sampling the CONVST pin state at the end of each conversion (EOC rising edge). If CONVST is low, the device enters power-down mode, reducing supply current to 5 µA max. This feature eliminates need for external power-control logic. Additionally, the AD7829BRUZ draws only 12 mA max during active conversion at 2 MSPS (5 V), and its power dissipation scales linearly with throughput - e.g., ~24 mW typical at full speed.

Is the AD7829BRUZ compatible with 3.3 V microcontrollers?

Yes, the AD7829BRUZ is fully compatible with 3.3 V microcontrollers. Its logic inputs accept VIH ≥2.0 V and VIL ≤0.4 V at 3 V ±10% supply, and its outputs drive VOH ≥2.4 V (min) and VOL ≤0.2 V (max) under same conditions - satisfying standard 3.3 V CMOS interface thresholds. No level-shifting circuitry is required when connecting the AD7829BRUZ's RD, CS, CONVST, and DB0–DB7 signals to 3.3 V logic families.