Analog Devices Inc. AD7934BRUZ

Overview

AD7934BRUZ from Analog Devices is a 12-bit, 4-channel, 1.5 MSPS successive approximation register (SAR) analog-to-digital converter with integrated channel sequencer, on-chip 2.5 V reference (±0.2% max @ 25°C), and flexible input configuration supporting single-ended, pseudo-differential, and fully differential modes. It operates from a single 2.7 V to 5.25 V supply and delivers 70 dB SINAD at 50 kHz input frequency - suitable for high-speed data acquisition in industrial process control systems.

For engineers reviewing the AD7934BRUZ datasheet, AD7934BRUZ pinout, AD7934BRUZ application, or AD7934BRUZ equivalent, key selection considerations include its 12-bit resolution with guaranteed no missing codes, software-configurable analog input structure, parallel word/byte interface with VDRIVE voltage independence, and low-power shutdown mode (2 μA max).

Technical Context

The AD7934BRUZ implements a SAR architecture with a differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Its internal sequencer enables preprogrammed, automatic cycling across four analog inputs without host intervention.

Conversion is triggered by the falling edge of CONVST, with no pipeline delay and deterministic timing governed by a 25.5 MHz master clock (CLKIN). The on-chip 2.5 V reference features 25 ppm/°C max temperature coefficient and supports external overdrive for precision system-level calibration.

Key Specifications

Pinout & Package

AD7934BRUZ is housed in a 28-lead TSSOP package (JEDEC MO-153, 4.4 mm × 9.7 mm body, 0.65 mm pitch), optimized for compact PCB layouts and thermal performance (θ_JA = 97.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7934-6BRUZ and AD7938BRUZ, the AD7934BRUZ uniquely balances 4-channel count, 1.5 MSPS speed, and 28-lead TSSOP footprint - making it optimal for space-constrained, medium-channel-count industrial DAQ where full-speed capability is essential.

Availability

AD7934BRUZ is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, portable data loggers, test & measurement front ends, and high-precision sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for AD7934BRUZ 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.

The AD7933/AD7934 product line was designed specifically for high-speed, low-power, multi-channel data acquisition in industrial automation and instrumentation - emphasizing integration, flexibility, and deterministic timing.

FAQ

What is the maximum sampling rate supported by the AD7934BRUZ?

The AD7934BRUZ supports a maximum throughput rate of 1.5 MSPS, achieved with a 25.5 MHz master clock (CLKIN). Conversion time is fixed at t₂ + 13 t_CLK, ensuring deterministic latency critical for closed-loop control. This rate is maintained across the full −40°C to +85°C temperature range and 2.7 V to 5.25 V supply range.

Does the AD7934BRUZ require an external reference voltage?

No, the AD7934BRUZ includes an accurate on-chip 2.5 V reference with ±0.2% maximum error at 25°C and 25 ppm/°C max temperature coefficient. However, the VREFIN/VREFOUT pin can be overdriven with an external reference from 0.1 V to VDD, enabling system-level calibration or improved absolute accuracy when needed.

How does the AD7934BRUZ handle analog input configuration?

The AD7934BRUZ supports three analog input topologies - single-ended, pseudo-differential, and fully differential - selected via MODE bits in its control register. Input range (0–VREF or 0–2×VREF) and output coding (straight binary or twos complement) are also software-configurable, allowing one device to serve multiple sensor types without hardware changes.

What is the purpose of the VDRIVE pin on the AD7934BRUZ?

The VDRIVE pin sets the logic voltage level for the parallel interface (DB0–DB11, RD, WR, CS, etc.), decoupling it from the core supply VDD. This allows the AD7934BRUZ to interface directly with 3 V or 5 V microprocessors regardless of whether VDD is at 3 V or 5 V - simplifying mixed-voltage system design and eliminating level-shifters.

Can the AD7934BRUZ perform automatic channel sequencing without processor involvement?

Yes, the AD7934BRUZ integrates a programmable channel sequencer that autonomously cycles through VIN0–VIN3 in user-defined order. Once configured via the control register, it performs conversions without host CPU intervention - reducing firmware load and enabling deterministic multi-channel sampling in real-time systems.