AD9235BRUZ-20

Overview

The AD9235BRUZ-20 is a monolithic, single-supply, 12-bit analog-to-digital converter (ADC) operating at a maximum sampling rate of 20 MSPS. It utilizes a multistage differential pipelined architecture with output error correction logic to ensure no missing codes across the full industrial temperature range (-40°C to +85°C). The device features a high-performance sample-and-hold amplifier (SHA) and an internal voltage reference. It operates from a single 3 V supply (2.7 V to 3.6 V) and includes a separate digital driver supply for compatibility with 2.5 V or 3.3 V logic families. The ADC accepts differential or single-ended analog inputs with flexible input spans ranging from 1 V p-p to 2 V p-p.

Feature Summary

• Multistage differential pipelined architecture with output error correction logic
• Integrated high-performance sample-and-hold amplifier (SHA)
• Internal voltage reference with selectable modes
• Single-ended clock input with duty cycle stabilizer

Applications

• Ultrasound equipment
• IF sampling in communications receivers
• Battery-powered instruments
• Hand-held scopemeters
• Low cost digital oscilloscopes

Procurement Notes

Verify the specific suffix 'RUZ' corresponds to the 28-lead TSSOP package configuration required for your PCB layout. Confirm that the -20 designation matches the 20 MSPS maximum conversion rate needed for your signal processing bandwidth. Ensure power supply decoupling meets the datasheet requirements for AVDD and DRVDD pins to maintain specified AC performance metrics.

Selection Notes

Select this component when a 12-bit resolution and 20 MSPS throughput are sufficient for the application. Consider the AD9235BRUZ-40 or AD9235BRUZ-65 if higher sampling rates are required, noting that pinouts remain compatible within the family. Evaluate the need for the internal reference versus an external precision reference based on system accuracy requirements and available board space.

Part Context

The AD9235BRUZ-20 belongs to the AD9235 family of 12-bit, 3 V A/D converters manufactured by Analog Devices Inc. This family shares a common architectural foundation but varies in maximum sampling speeds, specifically offering 20 MSPS, 40 MSPS, and 65 MSPS variants. The BRU/BCP prefix indicates the commercial grade temperature rating and specific package type, distinguishing it from other industry alternatives.

Replacement Considerations

The AD9235BRUZ-40 and AD9235BRUZ-65 serve as direct functional replacements within the same package, offering higher sampling rates while maintaining pinout compatibility. For legacy systems upgrading from 10-bit architectures, the AD9214-65 provides a simplified upgrade path due to similar pin configurations.