Analog Devices Inc. AD7994BRUZ-1REEL

Overview

AD7994BRUZ-1REEL from Analog Devices is a 4-channel, 12-bit successive approximation ADC with I²C-compatible serial interface, 2 µs typical conversion time, ±1 LSB max integral nonlinearity, and operation from 2.7 V to 5.5 V supply. It supports single-ended analog inputs (VIN1–VIN4), out-of-range alerting via programmable limit registers, and operates across −40°C to +125°C for industrial sensor monitoring systems.

For engineers reviewing the AD7994BRUZ-1REEL datasheet, AD7994BRUZ-1REEL pinout, AD7994BRUZ-1REEL application, or AD7994BRUZ-1REEL equivalent, key selection criteria include its 12-bit resolution with 70.5 dB SINAD, I²C high-speed mode support up to 3.4 MHz, 16-lead TSSOP package, and integrated sequencer for multi-channel acquisition without host intervention.

Technical Context

The AD7994BRUZ-1REEL implements a 4-channel multiplexer with track-and-hold amplifier supporting up to 11 MHz full-power bandwidth and 10 ns aperture delay. Its I²C interface supports standard, fast, and high-speed modes (up to 3.4 MHz), with pin-selectable addressing via AS input enabling five devices on one bus.

Conversion control supports three modes: CONVST-triggered (Mode 1), command-mode writes (Mode 2), and automatic cycle interval (Mode 3). An open-drain ALERT/BUSY pin serves dual function-out-of-range indicator or busy status-and internal limit registers store high/low thresholds per channel with hysteresis.

Key Specifications

Pinout & Package

AD7994BRUZ-1REEL is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin functions are validated per Analog Devices Rev. 0 datasheet Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, I²C ADC applications.

Compared with AD7994BRUZ-1REEL, AD7993BRUZ-1REEL trades 2 bits of resolution for lower cost and power, while ADS1114IDGSR offers higher resolution at drastically reduced throughput and lacks integrated channel sequencing - making AD7994BRUZ-1REEL optimal for real-time, multi-sensor, medium-precision industrial acquisition.

Availability

AD7994BRUZ-1REEL is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, automotive cabin climate control, and energy metering front-end applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7994BRUZ-1REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing operations worldwide.

The AD7994BRUZ-1REEL belongs to Analog Devices' I²C-compatible precision ADC product family, engineered for space-constrained, low-power, multi-sensor systems requiring deterministic timing and robust digital interface integration.

FAQ

What is the maximum I²C clock frequency supported by AD7994BRUZ-1REEL?

AD7994BRUZ-1REEL supports I²C high-speed mode up to 3.4 MHz when operated as the AD7994-1 variant (AS pin tied to GND or VDD). Standard mode (100 kHz) and fast mode (400 kHz) are supported across all variants. The part's throughput reaches 188 kSPS at 5 V with 3.4 MHz SCL, confirmed in Table 2 and Figure 4 of the AD7994 datasheet Rev. 0.

Does AD7994BRUZ-1REEL require an external reference voltage?

Yes, AD7994BRUZ-1REEL requires an external reference applied to the REFIN pin. The reference voltage must be between 1.2 V and VDD, and the datasheet specifies that a 0.1 µF ceramic capacitor plus a 1 µF bulk capacitor should be placed between REFIN and AGND. No internal reference is provided - REFIN directly defines the full-scale input range (0 V to REFIN) for all four analog inputs.

How many I²C addresses can be assigned to AD7994BRUZ-1REEL?

AD7994BRUZ-1REEL supports five distinct I²C addresses via the AS pin: GND (0x21), VDD (0x22), floating (0x20) for the -0 variant; and GND (0x23), VDD (0x24) for the -1 variant. The AD7994BRUZ-1REEL suffix indicates the -1 version, so it uses addresses 0x23 (AS = GND) or 0x24 (AS = VDD), as defined in Table 6 of the Rev. 0 datasheet.

What is the purpose of the ALERT/BUSY pin on AD7994BRUZ-1REEL?

The ALERT/BUSY pin on AD7994BRUZ-1REEL is a dual-function open-drain output. When configured as ALERT, it asserts low when any channel's conversion result violates user-programmed high/low limits stored in DATALOW/DATAHIGH registers. When configured as BUSY, it goes low during conversion and returns high upon completion. Configuration is controlled via the Configuration Register (bit ALRTBUSY), per Section "Alert/Busy Pin" on page 27.

Can AD7994BRUZ-1REEL operate from a 3.3 V supply?

Yes, AD7994BRUZ-1REEL is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal supplies. All electrical characteristics - including 70.5 dB SINAD, ±1 LSB INL, and 1 µA shutdown current - are guaranteed across this range at −40°C to +125°C. Logic thresholds scale with VDD (e.g., VINH = 0.7 × VDD), ensuring compatibility with 3.3 V microcontrollers.