Analog Devices Inc. AD7091BCPZ-RL7

Overview

AD7091BCPZ-RL7 from Analog Devices is a 12-bit successive approximation register (SAR) analog-to-digital converter optimized for ultralow-power, high-throughput data acquisition in space-constrained systems. It delivers 1 MSPS throughput at 3 V with 367 µA typical supply current, features an internal reference derived from VDD (0 V to VDD input range), and operates across −40°C to +125°C in an 8-lead 2 mm × 2 mm LFCSP package - ideal for battery-powered medical sensors and handheld instrumentation.

For engineers reviewing the AD7091BCPZ-RL7 datasheet, AD7091BCPZ-RL7 pinout, AD7091BCPZ-RL7 application, or AD7091BCPZ-RL7 equivalent, key selection considerations include its 12-bit resolution with ±1 LSB INL, SPI/QSPI/MICROWIRE-compatible serial interface, on-chip track-and-hold, flexible power/throughput scaling, and guaranteed no missing codes - all critical for precision, low-energy embedded sensing designs.

Technical Context

The AD7091BCPZ-RL7 implements a charge redistribution DAC-based SAR architecture with an integrated track-and-hold amplifier and internal oscillator, eliminating external clock dependencies. Its conversion control relies on edge-triggered CONVST and burst-mode SCLK synchronization, enabling deterministic 650 ns conversion time and 350 ns acquisition time for full-scale steps.

Power management is implemented via dual operational states: normal mode maintains full analog circuitry active for continuous 1 MSPS operation, while power-down mode reduces supply current to 324 nA at 3 V by disabling analog blocks while retaining serial interface functionality - allowing rapid wake-up (<100 µs) and burst-mode sampling strategies.

Key Specifications

Pinout & Package

AD7091BCPZ-RL7 is housed in an 8-lead, 2 mm × 2 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD) for thermal and mechanical reliability. The EPAD must be soldered to GND for optimal thermal performance (θJC = 6.67°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7042IRUGR and MAX11100ETE+, the AD7091BCPZ-RL7 uniquely combines VDD-referenced full-scale range, industry-leading 324 nA power-down current, and LFCSP thermal robustness - making it optimal for battery- and energy-harvesting–powered systems demanding wide input range and extended operational lifetime.

Availability

AD7091BCPZ-RL7 is available at Aetrix Electronics and suitable for battery-powered systems, handheld meters, and medical instruments requiring stable component supply across automotive, industrial, and IoT production programs.

Supply support for AD7091BCPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7091BCPZ-RL7 belongs to Analog Devices' ultralow-power precision SAR ADC product line, engineered specifically for energy-constrained, high-accuracy data acquisition in portable, medical, and industrial sensing applications.

FAQ

What is the maximum sampling rate supported by the AD7091BCPZ-RL7?

The AD7091BCPZ-RL7 supports a maximum throughput rate of 1 MSPS under specified conditions (VDD ≥ 2.09 V, fSCLK = 50 MHz, TA = −40°C to +125°C). This is achieved with a 650 ns conversion time and requires proper timing alignment of CONVST, CS, and SCLK signals per Table 2 in the datasheet. At lower throughput rates (e.g., 100 kSPS), supply current scales down to ~45 µA at 3 V.

Does the AD7091BCPZ-RL7 require an external voltage reference?

No, the AD7091BCPZ-RL7 does not require an external voltage reference. Its reference is derived internally from the VDD supply, resulting in an analog input range of 0 V to VDD. This architecture eliminates external reference components and associated decoupling, simplifying design and reducing BOM cost - though users must ensure VDD is sufficiently clean and stable for target accuracy.

How is power-down mode activated and exited on the AD7091BCPZ-RL7?

Power-down mode on the AD7091BCPZ-RL7 is entered by holding CONVST low prior to the end of a conversion (EOC); the device transitions within 100 µs after EOC. To exit, a rising edge on CONVST initiates wake-up, and the part becomes fully operational again after 100 µs. During power-down, the serial interface remains functional, allowing readout of the last conversion result without exiting low-power state.

What package type and thermal characteristics does the AD7091BCPZ-RL7 use?

The AD7091BCPZ-RL7 uses an 8-lead, 2 mm × 2 mm LFCSP package with exposed pad (EPAD). Its thermal resistance is θJA = 36.67°C/W and θJC = 6.67°C/W. For reliable operation, the EPAD must be soldered to a GND plane to maximize heat dissipation and mechanical stability - especially critical in high-temperature industrial applications up to +125°C.

Can the AD7091BCPZ-RL7 interface directly with a standard SPI microcontroller?

Yes, the AD7091BCPZ-RL7 features a native SPI-compatible serial interface supporting SPI, QSPI, MICROWIRE, and DSP protocols. It uses CS (active-low chip select), SCLK (up to 50 MHz), and SDO (3-state output) with MSB-first 12-bit data framing. No level shifters are needed for 3 V or 5 V microcontrollers, provided logic thresholds meet VINH ≥ 0.7×VDD and VINL ≤ 0.3×VDD specifications.