AD9042AST

Overview

The AD9042AST is a monolithic 12-bit analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 5 V supply and delivers a guaranteed minimum sample rate of 41 MSPS. The device features an internal track-and-hold circuit and voltage reference, eliminating external component requirements for basic operation. It utilizes a two-stage subrange architecture to achieve high performance with low power dissipation of 595 mW. The ADC provides CMOS-compatible digital outputs in a two's complement format via a parallel interface. It is housed in a 44-lead LQFP package and is rated for industrial operating temperatures ranging from -40°C to +85°C.

Feature Summary

• Integrated on-chip track-and-hold and voltage reference for simplified system design
• CMOS-compatible parallel digital output interface supporting TTL and CMOS logic families
• Low power consumption enabled by high-speed complementary bipolar process technology
• High spurious-free dynamic range maintained across the entire Nyquist bandwidth

Applications

• Cellular and PCS base stations
• GPS anti-jamming receivers
• Communications receivers
• Spectrum analyzers
• Medical imaging systems

Procurement Notes

Verify the complete ordering suffix against official documentation to ensure correct temperature grade and packaging configuration. Confirm that the specific variant matches the required industrial or military specifications. Check for RoHS compliance status and moisture sensitivity levels prior to integration into the manufacturing process.

Selection Notes

Select this component when a single-channel, high-speed conversion solution is required with minimal external support circuitry. Evaluate the input signal frequency against the 100 MHz analog bandwidth and ensure the clock source meets jitter requirements to maintain specified SNR. Consider the parallel interface complexity and available PCB space for the 44-lead LQFP footprint during the initial schematic capture phase.

Part Context

This part belongs to the AD9042 family of high-performance monolithic ADCs. It represents a specialized solution for wideband receiver applications where low power and high linearity are critical. The device leverages Analog Devices' proprietary XFCB process to deliver consistent performance across varying environmental conditions without requiring laser trimming.

Replacement Considerations

Direct pin-compatible replacements within the same series should be verified through official cross-reference lists. Ensure any substitute maintains the 41 MSPS sampling rate and 12-bit resolution. Verify that the alternative device supports the same 5 V single-supply requirement and parallel output coding format.