AD9238BSTRL-40

Overview

The AD9238BSTRL-40 is a dual-channel, 12-bit analog-to-digital converter (ADC) from Analog Devices. It operates at a maximum sampling rate of 40 MSPS with a single 3 V supply (2.7 V to 3.6 V). The device features dual high-performance sample-and-hold amplifiers and an integrated voltage reference. Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 70 dB and Spurious-Free Dynamic Range (SFDR) of 80.5 dBc at the Nyquist frequency. Power consumption is rated at 330 mW at full speed. It utilizes a multistage differential pipelined architecture with output error correction logic.

Feature Summary

• Dual-channel architecture with exceptional crosstalk immunity exceeding 85 dB.
• Integrated clock duty cycle stabilizer for maintaining performance across wide duty cycle variations.
• Flexible analog input range supporting user-selectable spans from 1 V p-p to 2 V p-p.
• Multiplexed data output option enabling single-port operation from either channel.

Applications

• Ultrasound equipment
• Direct conversion or IF sampling receivers
• WB-CDMA, CDMA2000, WiMAX systems

Procurement Notes

Verify the specific speed grade suffix matches the required sampling rate. Confirm package type availability as the component is offered in LQFP and LFCSP formats. Ensure power supply decoupling meets datasheet recommendations for DRVDD and AVDD pins. Check lead-free status and RoHS compliance documentation prior to ordering.

Selection Notes

Select this model when a 40 MSPS sampling rate is required between the 20 MSPS and 65 MSPS variants. Consider the 330 mW power dissipation against thermal constraints compared to the lower-speed 20 MSPS version. Evaluate the need for dual independent channels versus multiplexed single-port output configurations based on system interface requirements.

Part Context

This component belongs to the AD9238 family of dual 12-bit ADCs. It shares pin compatibility with the 14-bit AD9248 series. Speed grades are differentiated by suffixes indicating maximum sampling rates: -20 for 20 MSPS, -40 for 40 MSPS, and -65 for 65 MSPS. The BSTRL-40 designation indicates the 40 MSPS variant in tape and reel packaging.

Replacement Considerations

Pin-compatible alternatives within the same family include the AD9238BSTRL-20 and AD9238BSTRL-65 for different speed/power trade-offs. The AD9248 series offers 14-bit resolution with identical pinouts but requires verification of power and interface compatibility.