AD9241AS

Overview

The AD9241AS is a monolithic 14-bit, 1.25 MSPS analog-to-digital converter in a 44-pin MQFP package. It operates on a single +5 V supply with typical power consumption of 60 mW. The device features an on-chip sample-and-hold amplifier and programmable voltage reference. Key performance metrics include a Signal-to-Noise and Distortion Ratio (SINAD) of 78.0 dB at 100 kHz input frequency, a Spurious-Free Dynamic Range (SFDR) of 88.0 dB, and an Effective Number of Bits (ENOB) of 12.7 bits. Integral Nonlinearity is ±2.5 LSB typical, while Differential Nonlinearity is ±0.6 LSB typical.

Feature Summary

• Monolithic integration of a 14-bit ADC core with a high-performance, low-noise sample-and-hold amplifier and a programmable internal voltage reference.
• Flexible differential analog input structure supporting both single-ended and differential configurations with varying input spans.
• Digital output buffers configurable to interface directly with +3 V or +5 V CMOS logic families.
• Multi-stage differential pipelined architecture utilizing digital output error correction logic to guarantee no missing codes across the operating temperature range.

Applications

• Imaging systems including flatbed and drum document scanners
• Medical imaging equipment such as X-ray scanners and infrared imagers
• Communication systems employing Direct-IF down conversion

Procurement Notes

Verify the specific suffix AS indicates the -40°C to +85°C industrial temperature range and MQFP-44 package configuration. Confirm that the component matches the original Analog Devices manufacturing specifications for the AD9241 series. Ensure proper electrostatic discharge handling protocols are followed during storage and installation due to the device's sensitivity.

Selection Notes

Select this component when a single-supply, low-power 14-bit resolution is required at sampling rates up to 1.25 MSPS. The integrated reference and sample-and-hold simplify circuit design by reducing external component count. Consider the flexible input span options and CMOS-compatible digital outputs for ease of interfacing with standard logic families in data acquisition environments.

Part Context

The AD9241AS belongs to the AD924x family of single-chip 14-bit A/D converters, which also includes the AD9240 and AD9243 models. These devices were designed to replace hybrid implementations, offering significantly lower power consumption and cost while maintaining high dynamic performance. The AD9241 specifically targets applications requiring 1.25 MSPS throughput within a compact footprint.

Replacement Considerations

Direct functional substitutes within the same family include the AD9240 (10 MSPS) and AD9243 (3 MSPS), which share pin compatibility and architectural features but differ in maximum sampling rates. Verify that the higher speed requirements of these alternatives align with system timing constraints before substitution.

FAQ

What is the pipeline latency of the AD9241?

The AD9241 has a pipeline delay or latency of three clock cycles between the input sampling event and the appearance of the corresponding digital data at the output pins.

How does the AD9241 handle overvoltage conditions?

The device provides an Out-of-Range (OTR) signal to indicate an overflow condition. This signal can be used in conjunction with the Most Significant Bit (MSB) to determine whether the overflow is a low or high condition.

Can the analog inputs be configured for single-ended operation?

Yes, the versatile onboard sample-and-hold amplifier allows the AD9241 to be configured for either single-ended or differential inputs of varying spans, accommodating different system interface requirements.