Analog Devices Inc. AD7829BRUZ-REEL7

Overview

AD7829BRUZ-REEL7 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 after EOC assertion - used in high-speed data acquisition and DSP front ends.

For engineers reviewing the AD7829BRUZ-REEL7 datasheet, AD7829BRUZ-REEL7 pinout, AD7829BRUZ-REEL7 application, or AD7829BRUZ-REEL7 equivalent, key selection criteria include channel count (8 single-ended), conversion speed (2 MSPS), supply flexibility (3 V/5 V), input span adjustability via VMID, and parallel interface timing compatibility with microcontrollers and DSPs.

Technical Context

The AD7829BRUZ-REEL7 implements a two-stage 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 within 200 ns and supports full-power bandwidth up to 10 MHz.

Channel selection is performed externally via A0–A2 address inputs synchronized with RD; no internal register write is required. Power management combines automatic post-conversion shutdown (via CONVST sampling at EOC high) and optional external PD control (not present on AD7829).

Key Specifications

Pinout & Package

AD7829BRUZ-REEL7 is housed in a 28-lead TSSOP (Thin Shrink Small Outline Package), 4.4 mm × 9.7 mm body, 0.65 mm pitch, RoHS-compliant, tape-and-reel format (REEL7). Pin 1 marked by dot; exposed pad not electrically connected.

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 AD7825BRUZ and MAX1186EEE+, the AD7829BRUZ-REEL7 uniquely combines 8-channel parallel interfacing, on-chip reference, VMID-based input offset tuning, and automatic power-down - making it optimal for high-throughput, low-software-overhead embedded acquisition where analog front-end flexibility is critical.

Availability

AD7829BRUZ-REEL7 is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback loops, and communications subsampling applications requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.

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

The AD7822/AD7825/AD7829 family was designed for high-speed, low-latency data acquisition in resource-constrained embedded systems - emphasizing minimal interface logic, flexible supply operation, and integrated signal conditioning functions like on-chip reference and input span adjustment.

FAQ

What is the maximum sampling rate supported by the AD7829BRUZ-REEL7?

The AD7829BRUZ-REEL7 supports a maximum throughput of 2 MSPS, corresponding to a guaranteed maximum conversion time of 420 ns. This rate is achievable across the full operating temperature range (−40°C to +85°C) and both supply conditions (3 V ±10% and 5 V ±10%). The timing is validated with t1 = 420 ns in Table 2 of the Rev. C datasheet.

Does the AD7829BRUZ-REEL7 require an external reference voltage?

No, the AD7829BRUZ-REEL7 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 decoupled to AGND with a 0.1 µF capacitor. An external reference may be applied if higher precision or different voltage is required.

How is channel selection implemented on the AD7829BRUZ-REEL7?

Channel selection on the AD7829BRUZ-REEL7 is performed using three dedicated address inputs: A0, A1, and A2. These pins accept static logic levels before the RD signal goes low; no internal register writes or serial commands are needed. The selected channel (VIN1–VIN8) is sampled during the next conversion initiated by CONVST.

What is the function of the VMID pin on the AD7829BRUZ-REEL7?

The VMID pin on the AD7829BRUZ-REEL7 sets the center point of the analog input voltage span. When left unconnected, it defaults to 1.25 V (for 5 V supply) or 1.0 V (for 3 V supply), establishing a 0–2.5 V or 0–2.0 V input range. Connecting an external voltage to VMID shifts the entire input window while preserving span width, enabling offset correction for sensor or amplifier outputs.

Can the AD7829BRUZ-REEL7 operate from a 3.3 V supply?

Yes, the AD7829BRUZ-REEL7 is specified for 3 V ±10%, i.e., 2.7 V to 3.3 V operation. At 3.3 V, the input voltage span is 2.0 V (0 V to 2.0 V), and logic thresholds are adjusted accordingly (e.g., VINL ≤ 0.4 V, VINH ≥ 2.0 V). All DC accuracy and dynamic performance specs - including INL, DNL, SNR, and THD - are guaranteed across this range per Table 1.