AD9235BRUZRL7-20

Overview

The AD9235BRUZRL7-20 is a monolithic, single-supply, 12-bit analog-to-digital converter (ADC) from Analog Devices. It operates at a maximum sampling rate of 20 MSPS and is housed in a 28-lead TSSOP package. The device features a high-performance sample-and-hold amplifier (SHA) with a differential input bandwidth of 500 MHz and an internal voltage reference. It supports flexible analog input ranges from 1 V p-p to 2 V p-p and offers selectable offset binary or two's complement data formats. The component is designed for industrial temperature operation ranging from -40°C to +85°C.

Feature Summary

• Features a multistage differential pipelined architecture with output error correction logic to ensure no missing codes across the full operating temperature range.
• Includes a clock duty cycle stabilizer (DCS) to maintain excellent overall ADC performance despite wide variations in clock pulse widths.
• Provides a separate digital output driver supply pin to accommodate both 2.5 V and 3.3 V logic families.

Applications

• Ultrasound equipment
• IF sampling in communications receivers
• Battery-powered instruments

Procurement Notes

Verify that the ordering suffix RL7 corresponds to tape and reel packaging when sourcing this specific part number. Confirm the manufacturer is Analog Devices Inc. Ensure the component meets RoHS compliance standards required for your assembly process. Cross-reference the datasheet revision D specifications against your design requirements before finalizing procurement orders.

Selection Notes

Select the AD9235BRUZRL7-20 when a 20 MSPS sampling rate is sufficient for the application, as it provides cost advantages over higher-speed variants like the 40 MSPS or 65 MSPS models. Consider the 28-lead TSSOP package if board space constraints align with its dimensions. Verify that the 12-bit resolution and SNR performance meet the signal integrity requirements of the target system.

Part Context

This component belongs to the AD9235 family of 12-bit, 3 V A/D converters manufactured by Analog Devices. The family includes variants supporting different sampling rates, specifically 20 MSPS, 40 MSPS, and 65 MSPS. The BRUZ suffix indicates the industrial temperature grade and the TSSOP package type, while the RL7 designation specifies the reel packaging format.

Replacement Considerations

The AD9235 pinout allows for a simplified upgrade path from the 10-bit, 65 MSPS AD9214-65. Designers migrating from older architectures should verify compatibility with the AD9235's specific power supply and reference configurations.

FAQ

What is the pipeline delay latency of the AD9235?

The AD9235 has a fixed pipeline delay latency of 7 cycles.

How does the Out-of-Range (OTR) signal function?

The OTR output bit indicates when the analog input signal exceeds the selected input range, which can be used in conjunction with the most significant bit to determine low or high overflow conditions.

Can the AD9235 operate with single-ended inputs?

Yes, the wide bandwidth, truly differential SHA allows for user-selectable input ranges and offsets, including configuration for single-ended applications.