AD9240AS

Overview

The AD9240AS is a discontinued monolithic 14-bit, 10 MSPS analog-to-digital converter manufactured by Analog Devices Inc. It operates on a single +5 V supply and features an on-chip sample-and-hold amplifier and voltage reference. The device utilizes a multistage differential pipelined architecture with digital output error correction logic to guarantee no missing codes across the full operating temperature range. It provides flexible analog input configurations for both single-ended and differential signals. The component is housed in a 44-lead MQFP package.

Feature Summary

• Monolithic integration of a 14-bit ADC core with an on-chip high-performance sample-and-hold amplifier and programmable voltage reference.
• Multistage differential pipelined architecture incorporating digital output error correction logic to ensure no missing codes over the operating temperature range.
• Flexible analog input structure supporting both single-ended and differential interfaces with varying input spans.
• Configurable digital outputs capable of interfacing directly with +3 V and +5 V CMOS logic families.

Applications

• Direct-IF Down Conversion in communication systems
• Imaging systems requiring high-speed data acquisition
• Medical instrumentation applications
• General-purpose data-acquisition systems

Procurement Notes

Verify component authenticity through authorized channels as this part is obsolete. Confirm the specific suffix 'AS' matches the required thermal grade and packaging specifications. Check for available direct replacements such as the AD9240ASZ if new production units are required. Ensure all technical parameters align with the original design requirements before procurement.

Selection Notes

Select this component for applications requiring 14-bit resolution at sampling rates up to 10 MSPS. Consider the single +5 V supply requirement and the need for external biasing via the BIAS pin to optimize speed-power trade-offs. Evaluate the flexible input span options against the source signal characteristics. Verify compatibility with the target digital logic family for the parallel output interface.

Part Context

The AD9240AS belongs to the AD924x series, which includes the AD9243 and AD9241. These devices share a common 44-lead MQFP footprint and pinout but differ in maximum sampling rates of 10 MSPS, 3 MSPS, and 1.25 MSPS respectively. This series was designed to replace hybrid implementations, offering lower power consumption and cost while maintaining high performance in a compact monolithic form factor.

Replacement Considerations

The AD9240ASZ is listed as a direct replacement. Verify that the Z suffix indicates RoHS compliance or other environmental changes without altering functional electrical characteristics. Ensure pin compatibility and software/firmware timing adjustments remain valid for the substitute part.