Analog Devices Inc. AD7933BRU-REEL7

Overview

AD7933BRU-REEL7 from Analog Devices is a 10-bit, 4-channel, 1.5 MSPS parallel successive approximation register (SAR) ADC with integrated channel sequencer and on-chip 2.5 V reference. It operates from a single 2.7 V to 5.25 V supply, supports software-configurable single-ended/pseudo-differential/differential inputs, and delivers 61 dB SINAD at 50 kHz input frequency in differential mode. It is used in high-speed data acquisition systems requiring multi-channel sampling without pipeline delay.

For engineers reviewing the AD7933BRU-REEL7 datasheet, AD7933BRU-REEL7 pinout, AD7933BRU-REEL7 application, or AD7933BRU-REEL7 equivalent, key selection considerations include its 10-bit resolution, 1.5 MSPS throughput, 28-lead TSSOP package, VDRIVE interface voltage independence, and sequencer-controlled 4-channel conversion - all critical for embedded instrumentation and real-time control interfaces.

Technical Context

The AD7933BRU-REEL7 implements a SAR architecture with a differential track-and-hold amplifier supporting up to 50 MHz input bandwidth and no pipeline latency. Its sequencer enables preprogrammed channel cycling across VIN0–VIN3, configurable via control register MODE bits for single-ended, pseudo-differential, or fully differential acquisition.

Conversion is triggered by the falling edge of CONVST, synchronized to CLKIN (up to 25.5 MHz), with fixed 13-clock-cycle conversion time. The parallel interface operates in word/byte mode (W/B pin), and VDRIVE decouples logic I/O voltage (2.7 V–5.25 V) from analog supply VDD, enabling direct interfacing to 3 V or 5 V microprocessors.

Key Specifications

Pinout & Package

AD7933BRU-REEL7 is housed in a 28-lead thin shrink small outline package (TSSOP) with exposed pad (RU suffix), optimized for thermal performance and board space efficiency in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7933BRU-REEL7, AD7934BRU-REEL7 offers +2 bits resolution and +9 dB SINAD at identical speed and footprint, while AD7938BRU-REEL7 trades pin compatibility for double the channel count - making AD7933BRU-REEL7 optimal for cost- and space-constrained 4-channel 10-bit DAQ.

Availability

AD7933BRU-REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable test equipment, and medical sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD7933BRU-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 Norwood, MA.

The AD7933BRU-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, multi-channel data acquisition in industrial, instrumentation, and medical systems where accuracy, timing determinism, and integration density are critical.

FAQ

What is the maximum achievable throughput rate of the AD7933BRU-REEL7?

The AD7933BRU-REEL7 achieves a maximum throughput rate of 1.5 MSPS under specified conditions: VDD = 2.7 V to 5.25 V, fCLKIN = 25.5 MHz, and proper timing margins met. This rate is sustained across its full operating temperature range (−40°C to +85°C) and is enabled by its fixed 13-clock-cycle conversion time plus t2 setup delay. The AD7933BRU-REEL7 maintains this rate regardless of input configuration (single-ended, pseudo-differential, or differential) or reference source (internal or external).

Does the AD7933BRU-REEL7 support external reference voltage sources?

Yes, the AD7933BRU-REEL7 supports external reference voltages applied to the VREFIN/VREFOUT pin across a range of 0.1 V to VDD. When an external reference is used, the internal 2.5 V reference is disabled. The device retains full specification compliance - including INL, DNL, and SINAD - provided the external reference meets noise, stability, and drive capability requirements outlined in the AD7933BRU-REEL7 datasheet. Decoupling with a 470 nF capacitor to AGND remains mandatory.

How does the sequencer function in the AD7933BRU-REEL7?

The AD7933BRU-REEL7 sequencer is a hardware-based channel selector that automatically cycles through VIN0–VIN3 in a user-defined order stored in the control register's SEQ bits. Once enabled, it eliminates the need for repeated register writes to select channels - each CONVST trigger advances to the next channel in sequence. The sequencer operates independently of the host processor, reducing firmware overhead and jitter in time-critical acquisition loops. Channel order and repeat behavior are fully programmable via the control register.

What is the role of the VDRIVE pin on the AD7933BRU-REEL7?

The VDRIVE pin on the AD7933BRU-REEL7 sets the logic voltage level for all parallel interface pins (DB0–DB11, RD, WR, CS, W/B, HBEN), decoupling them from the analog supply VDD. This allows the AD7933BRU-REEL7 to interface directly with 3 V or 5 V microprocessors, FPGAs, or DSPs - even when VDD is at a different voltage - without external level shifters. VDRIVE must be within 2.7 V to 5.25 V and no more than 0.3 V above VDD to ensure reliable operation and avoid damage.

Is the AD7933BRU-REEL7 pin-compatible with the AD7934BRU-REEL7?

Yes, the AD7933BRU-REEL7 is pin-compatible with the AD7934BRU-REEL7: both use the identical 28-lead TSSOP (RU) package, share identical pin functions, pin numbering, and electrical interface specifications. They differ only in resolution (10-bit vs. 12-bit), dynamic performance (61 dB vs. 70 dB SINAD), and DC accuracy (±0.5 LSB vs. ±1 LSB INL). This allows drop-in replacement in existing designs where higher resolution is later required, provided firmware accommodates the extended data width and updated timing margins.