AD9238BCPZ-20

Overview

The AD9238BCPZ-20 is a dual-channel, 12-bit analog-to-digital converter (ADC) from Analog Devices. It operates on a single 3 V supply and supports sampling rates up to 20 MSPS. The device features dual high-performance sample-and-hold amplifiers with a differential input bandwidth of 500 MHz. It utilizes a multistage differential pipelined architecture with output error correction logic to guarantee no missing codes across the full operating temperature range. Key specifications include an SNR of 70.4 dB at 2.4 MHz input frequency and a typical power consumption of 180 mW per channel at the maximum 20 MSPS rate.

Feature Summary

• Dual-channel 12-bit pipeline ADC architecture with integrated voltage reference
• High-speed differential sample-and-hold amplifiers with 500 MHz bandwidth
• Built-in clock duty cycle stabilizer for performance maintenance
• Flexible analog input ranges supporting both differential and single-ended configurations

Applications

• Ultrasound imaging equipment
• Direct conversion or IF sampling receivers
• WB-CDMA, CDMA2000, and WiMAX communication systems
• Battery-powered instruments and hand-held scopemeters
• Low-cost digital oscilloscopes

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 the ordering code corresponds to the industrial temperature range specifications defined in the manufacturer's documentation.

Selection Notes

Select this model when a dual-channel solution with 12-bit resolution and 20 MSPS throughput is required. Consider the AD9238-40 or AD9238-65 variants if higher sampling speeds are necessary, noting the associated increase in power dissipation. Verify that the system clock duty cycle requirements align with the internal stabilizer capabilities.

Part Context

This component belongs to the AD9238 family of dual-channel converters. It shares pin compatibility with the AD9248 14-bit ADC. The product line offers speed grades of 20, 40, and 65 MSPS to balance power, cost, and performance requirements for various signal processing applications.

Replacement Considerations

The AD9238BCPZ-40 and AD9238BCPZ-65 are pin-compatible alternatives within the same series offering higher sampling rates. The AD9248 provides 14-bit resolution with identical pinout but different electrical characteristics.