AD6640AST

Overview

The AD6640AST is a monolithic, high-speed, low-power 12-bit analog-to-digital converter (ADC) designed for intermediate frequency (IF) sampling applications. It operates at a minimum sample rate of 65 MSPS with an 80 dB spurious-free dynamic range, supporting IF frequencies up to 70 MHz. The device integrates essential functions including a track-and-hold circuit and an internal reference, running on a single 5 V supply. It delivers CMOS-compatible digital outputs in two's complement format, compatible with both 3.3 V and 5 V logic levels, while dissipating approximately 710 mW of power.

Feature Summary

• Integrates track-and-hold and reference circuits for a complete conversion solution
• Supports IF sampling up to 70 MHz with high spurious-free dynamic range
• Operates on a single 5 V supply with CMOS-compatible output levels

Applications

• Cellular and PCS base stations
• Multichannel and multimode receivers
• GPS anti-jamming receivers
• Phased array receivers

Procurement Notes

Verify the specific suffix and revision level when ordering, as documentation indicates variations such as AD6640ASTZ. Confirm active status and availability through authorized distributors, as lead times may vary. Ensure compatibility with system voltage requirements, specifically the single 5 V supply operation. Check for RoHS compliance status if required by regulatory standards. Validate pinout and package dimensions against the latest datasheet before finalizing procurement.

Selection Notes

Select this component for applications requiring a 12-bit resolution at 65 MSPS with integrated tracking and reference capabilities. It is suitable for systems needing CMOS-compatible interfaces without external logic translation. Consider the 710 mW power dissipation for thermal management planning. Evaluate the 80 dB SFDR performance against system noise floor requirements. Ensure the input signal range matches the internal reference specifications for optimal linearity.

Part Context

The AD6640AST belongs to Analog Devices' family of high-speed ADCs designed for communication infrastructure. It serves as a direct replacement for older discrete solutions by integrating critical analog front-end functions. The device is commonly used in wireless base station architectures where size and power efficiency are critical constraints. Its parallel output interface simplifies connection to FPGAs or DSPs in standard receiver chains.

Replacement Considerations

The AD6640ASTZ is a documented variant within the same product family, offering identical functionality with potential packaging or compliance differences. Verify pin compatibility and electrical specifications before substituting. No other cross-model replacements are confirmed in the provided data.