AD4021BRMZ

Analog To Digital Converters (ADC) Overview

The AD4021BRMZ is a 20-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter (ADC) from Analog Devices Inc. It features Easy Drive technology, reducing input kickback and current to 0.5 μA/MSPS, which eliminates the need for dedicated driver amplifiers. The device operates on a single 1.8 V supply with a 1.71 V to 5.5 V logic interface. Key performance metrics include ±3.1 ppm maximum INL, 100.5 dB SNR at 1 kHz, and −123 dB THD. It supports differential analog inputs of ±VREF (2.4 V to 5.1 V) and includes input overvoltage clamp protection. The ADC is housed in a 10-lead MSOP package.

Analog To Digital Converters (ADC) Feature Summary

• Easy Drive architecture with reduced input current (0.5 μA/MSPS) and enhanced acquisition phase (≥77% cycle time at 1 MSPS).
• High accuracy with guaranteed 20-bit resolution, no missing codes, and ±3.1 ppm maximum integral nonlinearity (INL).
• Input span compression allows single-supply operation without negative supplies while preserving full code range.
• SPI/QSPI/MICROWIRE/DSP-compatible serial interface with separate VIO logic supply (1.71 V to 5.5 V).

Analog To Digital Converters (ADC) Applications

• Automated test equipment
• Machine automation
• Medical equipment
• Battery-powered equipment
• Precision data acquisition systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix BRMZ corresponds to the 10-lead MSOP package variant when sourcing. Confirm that the ordering part number matches the required throughput rate of 1 MSPS, distinct from the AD4020 (1.8 MSPS) or AD4022 (500 kSPS) variants within the same family. Ensure compatibility with the specified 1.8 V analog supply and independent digital logic voltage range.

Analog To Digital Converters (ADC) Selection Notes

Select the AD4021BRMZ for applications requiring 1 MSPS throughput with 20-bit precision. The Easy Drive feature simplifies the signal chain by removing the need for external buffer amplifiers, reducing power consumption and board space. Ensure the reference voltage is set between 2.4 V and 5.1 V. Consider the 10-lead MSOP package constraints for thermal management and PCB layout, particularly regarding the exposed pad connection to ground if using the LFCSP variant instead.

Analog To Digital Converters (ADC) Part Context

The AD4021 is part of the AD4020/AD4021/AD4022 family of high-speed, low-power, 20-bit SAR ADCs. These devices share identical pinouts and functional blocks but differ in maximum sampling rates: AD4020 operates at 1.8 MSPS, AD4021 at 1 MSPS, and AD4022 at 500 kSPS. This family is designed for precision applications where power scaling with throughput is critical.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible alternatives within the same family include the AD4020BRMZ (1.8 MSPS) and AD4022BRMZ (500 kSPS). Verify that the system timing requirements align with the specific throughput of the replacement device. Other 20-bit SAR ADCs may require different driver circuits due to the absence of Easy Drive features.