Analog Devices Inc. AD4003BRMZ

Overview

AD4003BRMZ from Analog Devices is a high-accuracy, 18-bit, 2 MSPS differential successive approximation register (SAR) analog-to-digital converter with Easy Drive architecture. It operates from a single 1.8 V supply, supports external reference voltages from 2.4 V to 5.1 V, delivers ±1.0 LSB INL and 100.5 dB SNR at 1 kHz, and targets precision data acquisition in automated test equipment and battery-powered instrumentation.

For engineers reviewing the AD4003BRMZ datasheet, AD4003BRMZ pinout, AD4003BRMZ application, or AD4003BRMZ equivalent, key selection considerations include its 2 MSPS throughput with turbo mode, 0.5 μA/MSPS input current reduction, 290 ns acquisition phase, and integrated overvoltage clamp protecting IN+/IN− up to 50 mA.

Technical Context

The AD4003BRMZ implements a differential SAR architecture with an internal high-Z acquisition mode that extends the acquisition window to ≥79% of the conversion cycle at 1 MSPS (290 ns at 2 MSPS). Its Easy Drive interface eliminates kickback-induced settling errors by reducing input current and enabling direct drive from low-power amplifiers without dedicated buffer stages.

It features a flexible SPI-compatible serial interface supporting 3-wire/4-wire modes, daisy-chain capability, and status bit reporting. Input span compression allows full-code-range operation with single-supply drivers, while the integrated clamp circuit sinks up to 50 mA during overvoltage events without disturbing the reference node.

Key Specifications

Pinout & Package

AD4003BRMZ is housed in a 10-lead, 3 mm × 3 mm LFCSP package with exposed pad for thermal performance and EMI control. Pin functions are validated per Analog Devices' AD4003 Rev. D datasheet (Pages 10–11).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-accuracy SAR ADC applications.

Compared with AD4003BRMZ, AD4007BRMZ trades speed for lower power and longer acquisition time-ideal for channel-multiplexed systems-while AD4020BRMZ increases resolution and SNR at the cost of speed and package size, serving ultra-high-precision metrology rather than high-throughput acquisition.

Availability

AD4003BRMZ is available at Aetrix Electronics and suitable for automated test equipment, portable instrumentation, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to +125°C operation.

Supply support for AD4003BRMZ 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 AD4003BRMZ belongs to Analog Devices' Easy Drive SAR ADC family, engineered to simplify precision signal chains by reducing driver complexity, power, and board area in high-channel-density data acquisition systems.

FAQ

What is the maximum achievable throughput for AD4003BRMZ, and what conditions are required?

The AD4003BRMZ achieves 2 MSPS maximum throughput only when turbo mode is enabled and the SCK clock frequency is ≥75 MHz with V_IO ≥ 2.7 V. At lower SCK rates or disabled turbo mode, throughput drops to 1.75–1.78 MSPS. This limit is defined by internal timing constraints in the conversion engine and serial interface logic, not by external sampling control.

Does AD4003BRMZ require an external driver amplifier for differential input signals?

No-AD4003BRMZ does not require an external driver amplifier due to its Easy Drive architecture. Its input current is reduced to 0.5 μA/MSPS and acquisition phase extended to 290 ns at 2 MSPS, enabling direct interface with low-output-impedance sources such as resistive sensor bridges or low-power op amps like the ADA4807.

How does the input overvoltage clamp in AD4003BRMZ protect the device during fault conditions?

The AD4003BRMZ input clamp activates when IN+ or IN− exceeds V_REF by ~0.25 V (e.g., 5.25 V at V_REF = 5 V), sinking up to 50 mA continuously for short durations. It prevents damage to internal sampling capacitors and avoids injecting current into the reference node-eliminating need for external Schottky diodes or series resistors in most industrial interfaces.

Can AD4003BRMZ operate with a 2.5 V reference voltage, and how does that affect performance?

Yes-AD4003BRMZ supports V_REF from 2.4 V to 5.1 V. At 2.5 V, SNR degrades to 94.5 dB (vs. 100.5 dB at 5 V), THD is −119 dB, and full-scale input range becomes ±2.5 V. The 18-bit resolution and no-missing-codes guarantee remain intact, making it viable for low-voltage, low-power systems where dynamic range trade-offs are acceptable.

Is AD4003BRMZ pin-compatible with other members of the AD4000 family?

Yes-AD4003BRMZ is pin-compatible with AD4000/AD4004/AD4008 family members in the same 10-lead LFCSP package. This allows drop-in replacement across speed grades (500 kSPS to 2 MSPS) and resolution variants (16–18 bit) without PCB redesign, provided layout accounts for shared V_DD, REF, and digital interface routing.