Analog Devices Inc. AD7091R-8BCPZ

Overview

AD7091R-8BCPZ from Analog Devices is an 8-channel, 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter optimized for ultralow-power battery-operated systems. It integrates a 2.5 V on-chip reference (5 ppm/°C drift), programmable channel sequencer, and SPI-compatible serial interface. Its 1.4 mW operational power at 3 V enables high-throughput data acquisition in portable medical instruments and sensor nodes.

For engineers reviewing the AD7091R-8BCPZ datasheet, AD7091R-8BCPZ pinout, AD7091R-8BCPZ application, or AD7091R-8BCPZ equivalent, key selection criteria include guaranteed no missing codes (12-bit DNL), −40°C to +125°C operation, daisy-chain capability, ALERT/BUSY/GPO0 multifunction pin configuration, and dual-supply flexibility (VDD = 2.7–5.25 V, VDRIVE = 1.8–5.25 V).

Technical Context

The AD7091R-8BCPZ implements a true SAR architecture with no pipeline latency, delivering deterministic 600 ns conversion time and 400 ns acquisition time. Its integrated channel sequencer supports preprogrammed scan order across all eight single-ended inputs without host intervention.

It features a dual-supply interface: VDD powers analog circuitry and internal reference, while VDRIVE independently sets digital I/O voltage level-enabling direct interfacing with 1.8 V logic even when VDD is 5 V. The MUXOUT/ADCIN signal path allows external buffering of multiplexer output prior to sampling.

Key Specifications

Pinout & Package

AD7091R-8BCPZ is housed in a 24-lead, 4 mm × 4 mm LFCSP package with exposed pad (EPAD), optimized for thermal performance and compact PCB layouts. Pin functions are validated per Analog Devices Rev. D datasheet Table 7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7091R-4BCPZ, AD7091R-8BCPZ provides double the channel count and second GPO in the same family architecture, while ADS8684IPWR trades ultralow power for higher resolution and input flexibility-making AD7091R-8BCPZ optimal for battery-constrained, 8-input sensor aggregation where 12-bit fidelity suffices.

Availability

AD7091R-8BCPZ is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7091R-8BCPZ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7091R-8BCPZ belongs to the AD7091R family of ultralow-power, multichannel SAR ADCs designed specifically for energy-constrained, high-channel-count data acquisition in portable and remote sensing applications.

FAQ

What is the maximum sampling rate of the AD7091R-8BCPZ, and does it introduce pipeline latency?

The AD7091R-8BCPZ achieves a maximum throughput rate of 1 MSPS with zero pipeline latency. As a true successive approximation register (SAR) ADC, it delivers fully settled 12-bit results within 600 ns of the CONVST falling edge-critical for real-time closed-loop control and time-sensitive event capture. This deterministic timing is confirmed in the Rev. D datasheet Table 2 (tCONVERT = 600 ns).

Does the AD7091R-8BCPZ require an external voltage reference, or is one integrated?

The AD7091R-8BCPZ includes a highly accurate, trimmed 2.5 V internal reference with typical drift of 5 ppm/°C and output voltage tolerance of 2.49 V to 2.51 V at 25°C. This eliminates the need for an external reference in most applications. The REFIN/REFOUT pin can also accept an external reference between 1.0 V and VDD if system-level calibration or alternate reference voltage is required.

How many analog input channels does the AD7091R-8BCPZ support, and what type of inputs are they?

The AD7091R-8BCPZ supports eight single-ended analog input channels (VIN0 through VIN7). It does not support differential or pseudo-differential input configurations. All inputs share a common 0 V to VREF range, with VREF sourced either from the internal 2.5 V reference or an external supply applied to the REFIN/REFOUT pin.

Can multiple AD7091R-8BCPZ devices be connected on the same SPI bus, and how is this achieved?

Yes, multiple AD7091R-8BCPZ devices can be daisy-chained on a single SPI bus using the dedicated daisy-chain mode. In this configuration, the SDO of one device connects to the SDI of the next, with a single CS line controlling the entire chain. The Rev. D datasheet Section "Daisy Chain" (p.36) confirms that 13 SCLK cycles per device read out conversion data sequentially-reducing MCU GPIO usage and simplifying routing in multi-ADC systems.

What are the power supply requirements for the AD7091R-8BCPZ, and can digital and analog supplies be independently set?

The AD7091R-8BCPZ requires two independent supplies: VDD (2.7 V to 5.25 V) powers the analog core and internal reference, while VDRIVE (1.8 V to 5.25 V) sets the digital I/O voltage level. This separation allows interfacing with 1.8 V microcontrollers while operating the ADC at 3.3 V or 5 V-confirmed in Table 1 (POWER REQUIREMENTS) and Figure 3 of the Rev. D datasheet.