AD9238BSTZ-65

Overview

The AD9238BSTZ-65 is a dual-channel, 12-bit analog-to-digital converter (ADC) from Analog Devices. It operates at a maximum sampling rate of 65 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 signal-to-noise ratio (SNR) of 70 dB and a spurious-free dynamic range (SFDR) of 80.5 dBc at Nyquist frequency. Power consumption is 600 mW at full speed. It utilizes a multistage differential pipelined architecture with output error correction logic to guarantee no missing codes across the industrial temperature range (-40°C to +85°C).

Feature Summary

• Dual-channel architecture with exceptional crosstalk immunity exceeding 85 dB.
• Integrated duty cycle stabilizer maintains performance over wide clock variations.
• Flexible analog input support for differential or single-ended signals with selectable ranges.
• Multiplexed data output option enables 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 ordering suffix against the manufacturer's current datasheet revision to confirm pinout compatibility and package type. Ensure that the required speed grade matches the application's throughput needs, as the AD9238 family includes variants with different maximum sampling rates. Confirm power supply requirements align with the specified 3 V operation.

Selection Notes

Select this component when high channel isolation and low power consumption are critical for dual-channel applications. Consider the available speed grades (20 MSPS, 40 MSPS, 65 MSPS) to balance performance against thermal constraints. Verify that the system clock can accommodate the duty cycle stabilizer requirements if precise timing is necessary.

Part Context

The AD9238 belongs to a family of dual, 12-bit ADCs designed for cost-sensitive, high-performance applications. It shares pin compatibility with the 14-bit AD9248, allowing for design flexibility between resolution and performance levels. The device is fabricated on an advanced CMOS process and is available in space-saving LQFP and LFCSP packages.

Replacement Considerations

The AD9248 is a pin-compatible alternative offering 14-bit resolution with similar speed grades. Single-channel equivalents like the AD9235 may be considered if only one channel is required, though they lack the inherent crosstalk benefits of the dual-package design.