Analog Devices Inc. AD7933BRU

Overview

AD7933BRU from Analog Devices is a 10-bit, 1.5 MSPS successive approximation register (SAR) analog-to-digital converter with integrated channel sequencer and on-chip 2.5 V reference. It supports four analog input channels in single-ended, pseudo-differential, or fully differential configurations, operates from a single 2.7 V to 5.25 V supply, and delivers 61 dB SINAD at 50 kHz input frequency for precision data acquisition in industrial sensor interfaces.

For engineers reviewing the AD7933BRU datasheet, AD7933BRU pinout, AD7933BRU application, or AD7933BRU equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready procurement guidance - all specific to the AD7933BRU variant in 28-lead TSSOP packaging.

Technical Context

The AD7933BRU implements a SAR architecture with no pipeline delay, using a 25.5 MHz master clock to achieve 1.5 MSPS throughput in 13 clock cycles plus t₂ setup time. Its track-and-hold amplifier supports up to 50 MHz full-power bandwidth and handles both single-ended and differential inputs via software-configurable MODE bits in the control register.

It features dual-supply flexibility: VDD powers analog/digital circuitry (2.7–5.25 V), while VDRIVE independently sets I/O logic levels (2.7–5.25 V), enabling direct interfacing with 3 V or 5 V microprocessors. The on-chip 2.5 V reference (±0.2% max @ 25°C, 25 ppm/°C) can be overdriven by an external source between 0.1 V and VDD.

Key Specifications

Pinout & Package

AD7933BRU is housed in a 28-lead Thin Shrink Small Outline Package (TSSOP) with exposed pad (RoHS-compliant, moisture sensitivity level 3). Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7934BRU and AD7938BRU, the AD7933BRU provides optimal balance of speed, resolution, and interface flexibility for 4-channel embedded systems where 10-bit accuracy suffices and mixed-voltage interoperability matters.

Availability

AD7933BRU is available at Aetrix Electronics and suitable for industrial process monitoring, medical sensor interfaces, automotive battery management, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7933BRU 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 centers worldwide.

The AD7933BRU belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, multi-channel data acquisition in noise-sensitive industrial and medical instrumentation.

FAQ

What is the maximum sampling rate supported by the AD7933BRU?

The AD7933BRU supports a maximum throughput rate of 1.5 million samples per second (MSPS), achieved using a 25.5 MHz master clock and completing conversion in exactly 13 clock cycles plus t₂ setup time. This rate is guaranteed across the full operating temperature range (−40°C to +85°C) and supply voltage range (2.7 V to 5.25 V), making it suitable for real-time signal capture in demanding embedded systems.

Does the AD7933BRU require an external reference voltage?

No, the AD7933BRU includes an accurate on-chip 2.5 V reference with ±0.2% maximum tolerance at 25°C and 25 ppm/°C temperature coefficient. This internal reference is sufficient for most precision applications. However, Pin 24 (VREFIN/VREFOUT) can be overdriven with an external reference between 0.1 V and VDD if higher accuracy or custom voltage scaling is required.

How does the channel sequencer function in the AD7933BRU?

The AD7933BRU's hardware sequencer automatically cycles through up to four analog input channels (VIN0–VIN3) in a preprogrammed order defined by the control register's SEQ bits. Once enabled, it eliminates the need for repeated host writes to the address bits before each conversion, reducing software overhead and ensuring deterministic timing for multi-channel acquisition loops.

Can the AD7933BRU interface directly with a 3 V microcontroller while operating from a 5 V supply?

Yes - the AD7933BRU's VDRIVE pin (Pin 11) allows independent setting of I/O logic levels. When VDRIVE = 3 V and VDD = 5 V, the parallel interface (DB0–DB11, RD, WR, CS, etc.) operates at 3 V logic thresholds while the analog core runs at 5 V, enabling direct connection to 3 V processors without external level shifters.

What power-saving modes are available on the AD7933BRU?

The AD7933BRU offers three power management states: Normal Mode (2.7 mA max at 5 V), Autostandby Mode (160 μA typ at 100 kSPS), and Full/Autoshutdown Mode (2 μA max). These are controlled via the control register's PD bits and allow dynamic adaptation to system activity - e.g., entering shutdown between bursts of sensor readings to extend battery life.