Analog Devices Inc. AD7091R-4BRUZ-RL7

Overview

AD7091R-4BRUZ-RL7 from Analog Devices is a 4-channel, 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter optimized for ultralow-power battery-operated systems. It features an on-chip 2.5 V reference (5 ppm/°C drift), integrated channel sequencer, and SPI-compatible digital interface. Its 1.4 mW operational power at 3 V / 1 MSPS enables high-precision data acquisition in space-constrained medical instruments and portable diagnostics.

For engineers reviewing the AD7091R-4BRUZ-RL7 datasheet, AD7091R-4BRUZ-RL7 pinout, AD7091R-4BRUZ-RL7 application, or AD7091R-4BRUZ-RL7 equivalent, key selection criteria include multichannel sequencing capability, 70 dB SNR at 10 kHz, ±0.7 LSB INL, −40°C to +125°C operation, and support for daisy-chain configuration in compact LFCSP packaging.

Technical Context

The AD7091R-4BRUZ-RL7 implements a true SAR architecture with no pipeline latency, delivering deterministic 1 MSPS throughput and 600 ns conversion time. Its internal track-and-hold operates via MUXOUT/ADCIN signal conditioning path, enabling single-buffer amplifier designs while maintaining 1.2 MHz full-power bandwidth at −0.1 dB.

It integrates a programmable configuration register controlling ALERT/BUSY/GPO0 multifunction pin behavior, channel sequencing order, power-down entry, and general-purpose output states. The dual-supply architecture separates analog (VDD: 2.7–5.25 V) and digital I/O (VDRIVE: 1.8–5.25 V) domains, supporting mixed-voltage system interfacing without level shifters.

Key Specifications

Pinout & Package

AD7091R-4BRUZ-RL7 is housed in a 20-lead, 4 mm × 4 mm LFCSP package with exposed pad (EPAD), optimized for thermal performance and PCB area efficiency. Pin functions are validated per Analog Devices Rev. D datasheet Table 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7091R-4BRUZ-RL7, the AD7091R-2BRUZ-RL7 reduces channel count without altering footprint or power profile, while the ADS8684IPWR trades speed and efficiency for resolution and signal conditioning flexibility-making each suitable for distinct system-level trade-offs in precision versus responsiveness.

Availability

AD7091R-4BRUZ-RL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial sensor hubs requiring stable component supply across long production lifecycles.

Supply support for AD7091R-4BRUZ-RL7 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, serving industrial, automotive, communications, and healthcare markets.

The AD7091R-4BRUZ-RL7 belongs to the AD7091R family of ultralow-power multichannel SAR ADCs designed specifically for energy-constrained, high-accuracy data acquisition in portable and distributed sensing systems.

FAQ

What is the maximum sampling rate supported by the AD7091R-4BRUZ-RL7?

The AD7091R-4BRUZ-RL7 supports a maximum throughput rate of 1 MSPS with no pipeline latency. This is achieved using its internal conversion clock and optimized SAR architecture, allowing full 12-bit results every 1 µs. At this rate, the device consumes 1.4 mW from a 3 V supply, making it suitable for real-time waveform capture in portable instrumentation where deterministic timing is essential. The AD7091R-4BRUZ-RL7 maintains this rate across its full operating temperature range of −40°C to +125°C.

Does the AD7091R-4BRUZ-RL7 require an external reference voltage?

No, the AD7091R-4BRUZ-RL7 includes a highly stable on-chip 2.5 V reference with typical drift of 5 ppm/°C, eliminating the need for external reference components in most applications. The REFIN/REFOUT pin can be used to either source this internal reference or accept an external reference between 1.0 V and VDD. When using the internal reference, a 2.2 µF decoupling capacitor is recommended on the REFIN/REFOUT pin to ensure optimal noise performance and stability. The AD7091R-4BRUZ-RL7's reference architecture supports both ratiometric and absolute measurement configurations.

How does the channel sequencer function in the AD7091R-4BRUZ-RL7?

The AD7091R-4BRUZ-RL7 features an integrated programmable channel sequencer that allows up to four analog inputs (VIN0–VIN3) to be converted in a preconfigured order without host MCU intervention. Sequencing is controlled via the Channel Register and Configuration Register, enabling automatic round-robin or custom scan patterns. This reduces software overhead and ensures precise inter-channel timing alignment-critical for phase-sensitive measurements such as differential sensor pairs. The AD7091R-4BRUZ-RL7 executes sequenced conversions synchronously upon each CONVST trigger, maintaining consistent sample intervals.

Can the AD7091R-4BRUZ-RL7 operate with different analog and digital supply voltages?

Yes, the AD7091R-4BRUZ-RL7 supports independent analog (VDD: 2.7–5.25 V) and digital I/O (VDRIVE: 1.8–5.25 V) supplies. This dual-supply architecture allows interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V microcontrollers without level-shifting circuitry. VDRIVE powers all digital pins (CS, SCLK, SDI, SDO, CONVST, RESET), while VDD supplies the analog core and reference. Decoupling capacitors must be applied separately to each supply. The AD7091R-4BRUZ-RL7 maintains full 1 MSPS throughput only when VDRIVE ≥ 2.7 V; at 1.8 V, functionality is preserved but maximum speed is reduced.

What are the key thermal characteristics of the AD7091R-4BRUZ-RL7 package?

The AD7091R-4BRUZ-RL7 uses a 20-lead, 4 mm × 4 mm LFCSP package with exposed pad (EPAD), offering θJA = 49.05°C/W and θJC = 29.18°C/W. The EPAD must be soldered to a PCB ground plane to achieve rated thermal performance and ensure reliable operation at maximum junction temperature (150°C). This package enables compact layouts while supporting continuous operation across −40°C to +125°C ambient, verified per JEDEC JESD51 standards. Thermal resistance values are measured under standard 2-layer board conditions with 1 in² copper pour beneath the EPAD.