Analog Devices Inc. AD4005BRMZ

Overview

AD4005BRMZ from Analog Devices is a 16-bit, 1 MSPS precision differential SAR ADC with Easy Drive architecture, ±0.4 LSB INL, 96.2 dB SNR at 1 kHz, and input overvoltage clamp protection. It operates from a single 1.8 V supply with 1.71–5.5 V logic interface and supports ±VREF differential input ranges up to ±5.1 V - used in high-accuracy data acquisition for medical instrumentation and automated test equipment.

For engineers reviewing the AD4005BRMZ datasheet, AD4005BRMZ pinout, AD4005BRMZ application, or AD4005BRMZ equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, 790 ns acquisition phase at 1 MSPS, high-Z mode compatibility with low-input-current amplifiers, and SPI/QSPI/MICROWIRE interface support with daisy-chain capability.

Technical Context

The AD4005BRMZ implements a successive approximation register (SAR) architecture with integrated Easy Drive circuitry that reduces input current to ≤1 μA at 1 MSPS and extends acquisition time to ≥79% of the conversion cycle. Its differential input stage accepts ±VREF spans (2.4–5.1 V), supports span compression for single-supply driver simplification, and includes on-chip input clamps sinking up to 50 mA.

Digital interface flexibility includes CS-mode (3-/4-wire) and daisy-chain modes, with status bit reporting and turbo mode enabling full 1 MSPS throughput using ≥80 MHz SCK. The device guarantees operation from −40°C to +125°C and achieves 126 dB oversampled dynamic range at OSR = 1024.

Key Specifications

Pinout & Package

AD4005BRMZ is housed in a 10-lead MSOP package (3 mm × 4.90 mm) with exposed pad connected to GND. Pin assignments are fully validated per Analog Devices' Rev. C datasheet Figure 3 and Table 7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD4005BRMZ, AD4003BRMZ offers higher speed in identical footprint but increases power and reduces acquisition time, while ADS8860IDRCT trades architectural simplicity for reduced feature set and stricter supply constraints - making AD4005BRMZ optimal for rugged, low-power, single-supply precision systems.

Availability

AD4005BRMZ is available at Aetrix Electronics and suitable for medical instrumentation, automated test equipment, and precision industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to +125°C operation.

Supply support for AD4005BRMZ 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 AD4005BRMZ belongs to the AD400x Easy Drive precision SAR ADC family, engineered to simplify signal chain design by reducing driver complexity, power, and board space in high-accuracy measurement applications.

FAQ

What is the maximum achievable throughput for AD4005BRMZ in standard CS mode?

The AD4005BRMZ achieves a guaranteed 1 MSPS throughput in CS mode with turbo mode enabled and an SCK frequency ≥80 MHz. At lower SCK rates (e.g., 50 MHz), throughput drops to ~1.5 MSPS in 4-wire mode with six status bits - verified in Table 4 of the Rev. C datasheet. Operation above 1 MSPS is not supported for AD4005BRMZ, distinguishing it from the 2 MSPS AD4001/AD4003 variants.

Does AD4005BRMZ require an external reference voltage, and what are the valid VREF ranges?

Yes, AD4005BRMZ requires an external reference voltage applied to the REF pin. Valid VREF ranges are 2.4 V to 5.1 V, with corresponding analog input spans of ±VREF (or ±0.8×VREF with span compression enabled). Reference current draw is 0.5 mA at 1 MSPS and 5 V VREF - necessitating a low-noise, high-current-capability reference IC such as the ADR4550.

How does the Easy Drive feature of AD4005BRMZ reduce system design complexity?

The Easy Drive feature in AD4005BRMZ reduces input current to ≤1 μA at 1 MSPS and extends acquisition time to 790 ns, eliminating the need for high-output-current, high-bandwidth ADC drivers. This allows direct interfacing with low-power op amps (e.g., ADA4807) or passive RC anti-alias filters - cutting bill-of-materials cost, PCB area, and power consumption in multi-channel systems.

Can AD4005BRMZ operate with a 1.8 V analog supply and 3.3 V digital interface simultaneously?

Yes, AD4005BRMZ supports independent analog and digital supplies: VDD = 1.71–1.89 V (typically 1.8 V) powers the core ADC, while VIO = 1.71–5.5 V (e.g., 3.3 V) sets logic levels for SDI, SDO, SCK, and CNV. This dual-rail capability enables seamless integration into mixed-voltage systems without level shifters - confirmed in Table 1 and Digital Inputs section of the datasheet.

Is AD4005BRMZ pin-compatible with other devices in the AD400x family?

Yes, AD4005BRMZ is pin-compatible with AD4003/AD4007/AD4011 in both 10-lead MSOP (RM-10) and 10-lead LFCSP (CP-10-9) packages. Shared pinout enables drop-in replacement within the same package variant - however, throughput (1 MSPS vs. 2 MSPS), power consumption, and certain timing parameters differ, requiring firmware validation per device.