AD9235BRU-40

Overview

The AD9235BRU-40 is a monolithic, single 3 V supply, 12-bit analog-to-digital converter operating at up to 40 MSPS. It utilizes a multistage differential pipelined architecture with output error correction logic to guarantee no missing codes across the industrial temperature range of –40°C to +85°C. The device features a wide bandwidth, truly differential sample-and-hold amplifier (SHA) and an on-chip voltage reference. Key electrical specifications include a Signal-to-Noise Ratio (SNR) of 70 dBc at Nyquist, a Spurious-Free Dynamic Range (SFDR) of 85 dBc at 65 MSPS, and a Differential Nonlinearity (DNL) of ±0.4 LSB. Power consumption is 300 mW at maximum speed.

Feature Summary

• Single 3 V supply operation with separate digital driver supply for 2.5 V or 3.3 V logic compatibility
• On-chip sample-and-hold amplifier and voltage reference supporting flexible analog input ranges
• Clock duty cycle stabilizer maintains performance over wide variations in clock pulse widths
• Out-of-range indicator signal identifies overflow conditions relative to the selected input range

Applications

• Ultrasound equipment
• IF sampling in communications receivers
• IS-95, CDMA-One, IMT-2000 systems
• Battery-powered instruments
• Low cost digital oscilloscopes

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature grade. Ensure that the DRVDD pin is properly decoupled with recommended capacitor values to maintain signal integrity. Confirm that the system clock requirements align with the specified maximum conversion rate and duty cycle stabilizer functionality for optimal ADC performance.

Selection Notes

Select this component when a 12-bit resolution is required at data rates up to 40 MSPS with low power consumption. The device is suitable for applications requiring a differential input interface with high analog bandwidth. Consider the available packages, such as the 28-lead TSSOP or 32-lead LFCSP, based on board space constraints and thermal management requirements for the specific design environment.

Part Context

The AD9235 family includes variants optimized for 20 MSPS, 40 MSPS, and 65 MSPS speeds. The BRU-40 variant specifically targets the 40 MSPS performance tier while maintaining the same 12-bit accuracy and architectural features as the higher-speed models. This allows designers to balance power consumption and performance requirements within the same component family.

Replacement Considerations

The AD9214-65 is noted as having a similar pinout, allowing for simplified upgrades from 10-bit to 12-bit systems. Verify pin compatibility and logic levels before substitution. No other direct replacement part numbers are explicitly confirmed in the provided documentation.