Analog Devices Inc. AD7091R-2BCPZ

Overview

AD7091R-2BCPZ from Analog Devices is a 2-channel, 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter optimized for ultralow-power battery-operated systems. It operates from a single 2.7 V to 5.25 V supply, consumes 1.4 mW at full throughput, and integrates a precise 2.5 V reference with 5 ppm/°C drift - enabling direct sensor interfacing in portable medical instruments and diagnostic monitoring devices.

For engineers reviewing the AD7091R-2BCPZ datasheet, AD7091R-2BCPZ pinout, AD7091R-2BCPZ application, or AD7091R-2BCPZ equivalent, key selection criteria include its 1 MSPS zero-latency conversion rate, ±0.7 LSB typical INL, on-chip channel sequencer, SPI-compatible interface with CONVST-triggered acquisition, and support for independent VDRIVE (1.8–5.25 V) logic supply - critical for mixed-voltage embedded data acquisition designs.

Technical Context

The AD7091R-2BCPZ implements a true SAR architecture with no pipeline delay, using an internal conversion clock and track-and-hold circuit controlled by the CONVST falling edge. Its multiplexer output (MUXOUT) and dedicated ADC input (ADCIN) pins enable external signal conditioning before sampling, while the integrated 2.5 V reference supports ratiometric measurements without external components.

It features a programmable configuration register managing power modes (normal/power-down), channel sequencing, and digital I/O behavior. Unlike pipelined or sigma-delta ADCs, it delivers deterministic 600 ns conversion time and 400 ns acquisition time - essential for time-critical control loops and synchronized multi-sensor sampling.

Key Specifications

Pinout & Package

The AD7091R-2BCPZ is housed in a 16-lead, 4 mm × 4 mm LFCSP package with exposed pad (EPAD), optimized for thermal performance and compact PCB layout in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7953IRHBT and MAX11102ETE+, the AD7091R-2BCPZ uniquely combines dual-channel operation, on-chip 2.5 V reference, 70 dB SNR, and sub-microwatt power-down - making it optimal for miniaturized, battery-powered diagnostic tools where BOM count, thermal headroom, and long-term calibration stability are decisive.

Availability

AD7091R-2BCPZ is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and optical sensor modules requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for AD7091R-2BCPZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7091R-2BCPZ belongs to Analog Devices' ultralow-power precision SAR ADC product line, engineered specifically for energy-constrained, high-accuracy data acquisition in portable and remote sensing applications.

FAQ

What is the maximum sampling rate supported by the AD7091R-2BCPZ?

The AD7091R-2BCPZ supports a maximum throughput rate of 1 MSPS (million samples per second) with no pipeline delay or latency. This is achieved using its internal conversion clock and optimized SAR architecture, delivering deterministic 600 ns conversion time and 400 ns acquisition time. At this rate, the AD7091R-2BCPZ maintains full 12-bit resolution, ±0.7 LSB INL, and 70 dB SNR - making it suitable for real-time signal capture in portable diagnostics and industrial monitoring systems where timing predictability is critical.

Does the AD7091R-2BCPZ require an external voltage reference?

No, the AD7091R-2BCPZ does not require an external voltage reference. It integrates a highly accurate 2.5 V reference with 5 ppm/°C typical drift and ±10 mV initial tolerance, accessible via the REFIN/REFOUT pin. This internal reference supports ratiometric measurements and eliminates the need for external reference ICs in most applications. However, the device also accepts an external reference from 1.0 V to VDD applied to the same pin, allowing users to improve absolute accuracy or adapt to non-standard full-scale ranges when required.

How does the AD7091R-2BCPZ manage power in low-duty-cycle applications?

The AD7091R-2BCPZ provides two distinct power modes: Normal Mode (500–570 µA at 1 MSPS) and Power-Down Mode (435 nA typical at 3 V). In low-duty-cycle applications, the host processor can assert the chip select (CS) line and issue a software command to enter power-down, reducing quiescent current by over 1,000×. Wake-up is immediate upon exit - the device achieves full operational readiness within 50 ms after power-on due to its fast reference turn-on time. This behavior makes the AD7091R-2BCPZ ideal for battery-powered sensors that sample intermittently, such as environmental loggers or wearable health monitors.

Can the AD7091R-2BCPZ interface directly with a 1.8 V microcontroller?

Yes, the AD7091R-2BCPZ supports direct interface with 1.8 V microcontrollers via its independent VDRIVE supply pin, which operates from 1.8 V to 5.25 V. Digital I/O levels (CS, CONVST, SDI, SDO, SCLK) are referenced to VDRIVE, not VDD - allowing seamless connection to low-voltage logic without level shifters. The device maintains full SPI functionality and timing compliance (e.g., tSCLK ≥ 22 ns) at 1.8 V VDRIVE, while the analog core continues operating from a separate 2.7–5.25 V VDD supply. This dual-supply architecture simplifies mixed-voltage system design and preserves ADC performance regardless of host controller voltage.

What is the purpose of the MUXOUT and ADCIN pins on the AD7091R-2BCPZ?

The MUXOUT pin outputs the selected analog channel signal from the internal multiplexer, while the ADCIN pin feeds that signal into the on-chip track-and-hold amplifier prior to conversion. This separation enables external signal conditioning - such as RC filtering, gain amplification, or anti-aliasing - between MUXOUT and ADCIN. If no conditioning is needed, MUXOUT and ADCIN can be shorted directly. This architecture gives designers flexibility to optimize noise, bandwidth, and settling behavior for each application, unlike monolithic ADCs with fixed input paths. For the AD7091R-2BCPZ, this supports high-fidelity acquisition in optical sensors and medical electrodes where source impedance and noise sensitivity vary significantly.