Analog Devices Inc. AD7829BRU

Overview

AD7829BRU from Analog Devices is an 8-bit, 2 MSPS, 8-channel parallel-output analog-to-digital converter with on-chip 2.5 V reference, 420 ns conversion time, and single-supply operation at 3 V ±10% or 5 V ±10%. It integrates track-and-hold, half-flash ADC architecture, and automatic power-down triggered by CONVST logic level at end-of-conversion - used in high-speed data acquisition systems and DSP front ends.

For engineers reviewing the AD7829BRU datasheet, AD7829BRU pinout, AD7829BRU application, or AD7829BRU equivalent, key selection considerations include its 8-channel multiplexed analog input support (VIN1–VIN8), EOC-driven interrupt capability, VMID-adjustable input span centering, and compatibility with microprocessor/DSP parallel buses without external timing logic.

Technical Context

The AD7829BRU implements a two-stage half-flash ADC architecture: a 4-bit coarse flash stage followed by a 4-bit fine flash stage, delivering full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input within 200 ns and supports full-power bandwidth up to 10 MHz for subsampling applications.

Channel selection is performed via asynchronous A0–A2 address inputs sampled on RD falling edge; conversion initiation and power-state control share the CONVST pin, enabling automatic power-down after each conversion when CONVST is held low at EOC assertion. The device uses separate AGND/DGND pins and supports flexible reference configuration via VREF IN/OUT.

Key Specifications

Pinout & Package

The AD7829BRU is housed in a 28-lead TSSOP package (body width 4.4 mm, lead pitch 0.65 mm), RoHS-compliant and rated for −40°C to +85°C industrial operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, multi-channel, parallel-output ADC applications.

Compared with AD7825BRU, AD7829BRU provides two additional analog inputs and one extra address line (A2), enabling full 8-channel operation without redesigning the analog front end or bus interface. Against MAX1186EEE+, AD7829BRU offers hardware-compatible parallel timing, integrated reference, and autonomous power management - critical for deterministic low-latency systems.

Availability

AD7829BRU is available at Aetrix Electronics and suitable for high-speed data acquisition systems, DSP-based signal processing platforms, and disk drive servo control requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AD7829BRU 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, with design and manufacturing expertise spanning precision converters, amplifiers, and RF ICs.

The AD7829BRU belongs to Analog Devices' high-speed sampling ADC family designed specifically for real-time, low-latency digitization in data acquisition, communications, and industrial control - emphasizing speed, integration, and ease of microprocessor interfacing.

FAQ

What is the maximum sampling rate supported by the AD7829BRU?

The AD7829BRU supports a maximum throughput of 2 MSPS, with a guaranteed maximum conversion time of 420 ns. This rate is achievable across the full industrial temperature range (−40°C to +85°C) and under both 3 V ±10% and 5 V ±10% supply conditions, as verified in the Rev. C datasheet timing characteristics table.

Does the AD7829BRU require an external reference voltage?

No, the AD7829BRU includes an on-chip 2.5 V reference with ±50 mV accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected for internal reference use or driven by an external precision source like the AD780 - making the AD7829BRU functional with or without external reference components.

How does channel selection work on the AD7829BRU?

Channel selection on the AD7829BRU is performed using three dedicated address pins - A0, A1, and A2 - which are sampled asynchronously on the falling edge of the RD signal. No internal register programming or serial configuration is needed; the selected channel (VIN1–VIN8) is converted on the next CONVST falling edge, enabling simple, deterministic multiplexing.

What is the function of the VMID pin on the AD7829BRU?

The VMID pin on the AD7829BRU sets the center voltage of the analog input span. With no connection, it defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), establishing a 0 V to 2 V or 0 V to 2.5 V input range. Applying an external voltage to VMID shifts the entire input range linearly, allowing DC offset correction for op-amp stages or sensor interfaces without external level shifters.

Can the AD7829BRU operate from a 3.3 V supply?

Yes, the AD7829BRU is explicitly specified for 3 V ±10% operation (2.7 V to 3.3 V), with validated performance including 420 ns conversion time, 48 dB SNR at 30 kHz input, and correct logic thresholds (VINH ≥ 2.0 V, VINL ≤ 0.4 V). All dynamic and dc specifications in Table 1 of the Rev. C datasheet apply across this range.