AD9774ASRL

Digital To Analog Converters Overview

The AD9774ASRL is a single-supply, oversampling 14-bit digital-to-analog converter (DAC) from Analog Devices Inc., housed in a 44-lead MQFP package. It integrates a two-stage 4× digital interpolation filter and an on-chip PLL clock multiplier to support input data rates up to 32 MSPS at 5 V operation. The device provides differential current outputs with a nominal compliance range of 1.25 V and a full-scale current adjustable between 2 mA and 20 mA. Key performance metrics include a reconstruction bandwidth of 13.5 MHz, 77 dBc SFDR at 5 MHz, and image rejection exceeding 69 dB. It operates over the industrial temperature range of -40°C to +85°C.

Digital To Analog Converters Feature Summary

• Integrates a 4× digital interpolation filter that suppresses inband images by more than 69 dB, reducing analog reconstruction filter complexity.
• Features an on-chip PLL clock multiplier generating internal 1×, 2×, and 4× clocks from an external reference.
• Provides differential current outputs with adjustable full-scale current ranging from 2 mA to 20 mA via the FSADJ pin.
• Includes a temperature-compensated 1.20 V bandgap reference and edge-triggered CMOS latches for direct logic interfacing.

Digital To Analog Converters Applications

• Wireless basestation transmit channels
• ADSL/HFC modem signal generation
• Direct Digital Synthesis (DDS) systems

Digital To Analog Converters Procurement Notes

Verify the specific suffix 'ASRL' against official documentation, as standard listings typically identify the industrial grade part as AD9774AS in a 44-lead MQFP package. Confirm RoHS compliance status and lead finish details directly with the manufacturer or authorized distributors, as historical datasheets may not reflect current environmental declarations.

Digital To Analog Converters Selection Notes

Select this component for applications requiring high dynamic range waveform reconstruction with simplified analog filtering needs. Ensure the system design accommodates the 44-lead MQFP footprint and thermal requirements, noting a thermal resistance of 53.2°C/W. Verify that the required output update rate does not exceed 128 MSPS and that the supply voltage aligns with the 2.7 V to 5.5 V operating range.

Digital To Analog Converters Part Context

The AD9774 belongs to the TxDAC+ family of high-performance, low-power CMOS DACs optimized for communications. It shares architectural similarities with other devices in the series but is distinguished by its integrated 4× interpolation filter and PLL multiplier, which are designed to enhance spectral purity and ease system integration compared to non-interpolating counterparts.

Digital To Analog Converters Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult Analog Devices for current product lifecycle status and potential obsolescence information before finalizing procurement plans.