AD9238BST-65

Overview

The AD9238BST-65 is a dual-channel, 12-bit analog-to-digital converter (ADC) from Analog Devices Inc., operating at a maximum sampling rate of 65 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 dual high-performance sample-and-hold amplifiers (SHAs) and an integrated voltage reference. It operates on a single 3 V supply (2.7 V to 3.6 V) with a typical power consumption of 600 mW at maximum speed. Key performance metrics include a Signal-to-Noise Ratio (SNR) of 70 dB and a Spurious-Free Dynamic Range (SFDR) of 80.5 dBc at Nyquist frequency.

Feature Summary

• Integrated dual 12-bit ADCs with exceptional channel isolation exceeding 85 dB.
• Built-in clock duty cycle stabilizer maintains performance over wide duty cycle 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 speed grade suffix '-65' corresponds to the 65 MSPS variant when ordering. Confirm package availability in LQFP-64 format as specified. Ensure compatibility with the required 3 V analog and digital supply voltages. Check for RoHS compliance status if environmental regulations apply to the deployment environment.

Selection Notes

Select this component for applications requiring high dynamic performance in a dual-channel configuration. Consider the 600 mW power dissipation at 65 MSPS for thermal management planning. Evaluate the need for the internal reference versus external precision references based on system noise requirements. Verify that the parallel interface timing aligns with the target FPGA or DSP controller capabilities.

Part Context

This part belongs to the AD9238 family, which includes variants rated for 20 MSPS and 40 MSPS. It is pin-compatible with the AD9248, a 14-bit version of the same converter family. The device is fabricated using an advanced CMOS process and is available in both 64-lead LQFP and LFCSP packages.

Replacement Considerations

The AD9238BST-40 and AD9238BST-20 are lower-speed variants within the same family offering reduced power consumption. For higher resolution needs, the AD9248 series provides pin-compatible 14-bit performance. Single-channel alternatives like the AD9235 may be considered if only one channel is required.