Analog Devices Inc. AD7911ARMZ

Overview

AD7911ARMZ from Analog Devices is a 10-bit, dual-channel, successive approximation analog-to-digital converter (ADC) operating from a single 2.35 V to 5.25 V supply, delivering 250 kSPS throughput with 61 dB SINAD at 100 kHz input and ±0.5 LSB integral nonlinearity - used in portable medical instruments and battery-powered data acquisition systems requiring low power and compact size.

For engineers reviewing the AD7911ARMZ datasheet, AD7911ARMZ pinout, AD7911ARMZ application, or AD7911ARMZ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts - all grounded in Analog Devices' Rev. A datasheet and official package documentation.

Technical Context

The AD7911ARMZ implements a true successive approximation register (SAR) architecture with no pipeline delay, using CS-controlled sampling on its falling edge and SCLK-synchronized conversion timing. Its internal track-and-hold amplifier supports full-power bandwidth up to 8.5 MHz and handles input frequencies beyond 6 MHz with 71 dB minimum SNR.

It features flexible serial interface compatibility (SPI/QSPI/MICROWIRE/DSP), channel selection via DIN, and a built-in VDD-referenced ADC core enabling 0 V to VDD analog input range. Power management includes full power-down mode with ≤1 μA standby current and dynamic power scaling tied directly to SCLK frequency and throughput rate.

Key Specifications

Pinout & Package

AD7911ARMZ is packaged in an 8-lead TSOT (Thin Small Outline Transistor) with 0.5 mm pitch, measuring 3.0 mm × 1.7 mm × 0.8 mm - optimized for space-constrained PCB layouts in handheld equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with AD7921ARMZ and ADS7822U, AD7911ARMZ uniquely balances 10-bit precision, 2.35–5.25 V operation, −90 dB channel isolation, and sub-5 mW power - making it the preferred choice for dual-input, battery-sensitive instrumentation where 10-bit ENOB suffices.

Availability

AD7911ARMZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data acquisition, optical sensor interfaces, and industrial control loop monitoring requiring stable component supply across extended production lifecycles.

Supply support for AD7911ARMZ 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, with R&D and manufacturing infrastructure spanning North America, Europe, and Asia.

AD7911ARMZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for portable, low-power, dual-channel data acquisition in space- and energy-constrained applications - emphasizing simplicity, reliability, and seamless microcontroller integration.

FAQ

What is the maximum sampling rate supported by the AD7911ARMZ?

The AD7911ARMZ supports a maximum throughput rate of 250 kSPS, achieved with a 5 MHz SCLK and 14 SCLK cycles per conversion. This rate is guaranteed across the full −40°C to +85°C operating temperature range and 2.35 V to 5.25 V supply voltage, enabling reliable real-time digitization of signals up to 125 kHz without aliasing. The AD7911ARMZ maintains this performance without pipeline delay or latency variation.

Does the AD7911ARMZ require an external voltage reference?

No, the AD7911ARMZ uses an internal reference derived from the VDD supply, supporting an analog input range of 0 V to VDD. This eliminates the need for external reference ICs or precision resistive dividers, reducing bill-of-materials cost and PCB area. The AD7911ARMZ maintains specified DC accuracy (±0.5 LSB INL) and dynamic performance (61 dB SINAD) across its full 2.35 V to 5.25 V VDD range.

How does channel selection work on the AD7911ARMZ?

Channel selection on the AD7911ARMZ is performed via the DIN pin: the third MSB of the serial data stream written during CS assertion determines whether VIN0 or VIN1 is sampled. The DOUT stream includes a dedicated channel identifier bit, allowing firmware to unambiguously associate each 10-bit conversion result with its source channel - essential for synchronized dual-sensor applications without additional GPIO or multiplexer control.

What package type is used for the AD7911ARMZ?

The AD7911ARMZ is supplied in an 8-lead TSOT (Thin Small Outline Transistor) package with 0.5 mm lead pitch, measuring 3.0 mm × 1.7 mm × 0.8 mm. This RoHS-compliant, surface-mount package is optimized for high-density portable designs and is pin-compatible with the 8-lead MSOP variant (AD7911ARM), though mechanical mounting and thermal characteristics differ.

What is the power consumption of the AD7911ARMZ in power-down mode?

In full power-down mode, the AD7911ARMZ draws ≤1 μA maximum supply current - typically 50 nA - regardless of SCLK state or supply voltage (2.35 V to 5.25 V). This ultra-low quiescent current enables extended battery life in intermittently active systems such as wireless sensor nodes or handheld diagnostics, where the AD7911ARMZ can remain in standby between measurement bursts without compromising wake-up timing or accuracy.