AD9773BSVZRL

Digital To Analog Converters Overview

The AD9773BSVZRL is a 12-bit, dual-channel digital-to-analog converter (DAC) from Analog Devices' TxDAC+ family. It supports input data rates up to 160 MSPS and achieves an internal DAC update rate of 400 MSPS via selectable 2×, 4×, or 8× interpolation filters. The device operates on a single 3.1 V to 3.5 V supply with typical power dissipation of 1.2 W at full scale. Key features include programmable channel gain and offset adjustment, fS/2, fS/4, and fS/8 digital quadrature modulation capabilities, and a direct IF transmission mode for frequencies above 70 MHz. It integrates an internal PLL clock multiplier, a 1.2 V reference, and interfaces via parallel data inputs and a serial peripheral interface (SPI).

Digital To Analog Converters Feature Summary

• 12-bit resolution with 400 MSPS maximum DAC output update rate.
• Selectable 2×, 4×, or 8× half-band interpolation filters to ease reconstruction filter requirements.
• Integrated digital quadrature modulation supporting fS/2, fS/4, and fS/8 image rejection architectures.
• Programmable channel gain control (±1 dB range) and offset adjustment (±10% of FSR).
• Internal 1.2 V temperature-compensated bandgap voltage reference and programmable PLL clock multiplier.

Digital To Analog Converters Applications

• Analog quadrature modulation architecture in wireless communications.
• 3G, multicarrier GSM, TDMA, and CDMA base station systems.
• Broadband wireless and point-to-point microwave radio transmitters.
• Direct IF transmission applications requiring image rejection without external mixers.

Digital To Analog Converters Procurement Notes

Verify the component revision against the manufacturer's current documentation, as specifications are subject to change. Confirm that the ordering suffix corresponds to the tape-and-reel packaging format required for automated assembly processes. Ensure compatibility with the system's thermal management strategy, given the 1.2 W power dissipation at nominal operating conditions.

Digital To Analog Converters Selection Notes

Select this component when a 12-bit resolution is sufficient for the application's dynamic range requirements while utilizing high-speed interpolation to reduce baseband processing load. Consider the integrated digital modulation features if the design aims to simplify the transmit chain by reducing the number of external SAW filters or mixers. Verify that the 80-lead TQFP_EP package footprint aligns with the PCB layout constraints and thermal pad soldering capabilities.

Digital To Analog Converters Part Context

The AD9773BSVZRL belongs to the AD977x family of pin-compatible, high-performance interpolating DACs. It shares the same functional block diagram and software register map as other members of the series, differing primarily in resolution and speed characteristics. This specific part represents the 12-bit variant optimized for cost-sensitive multicarrier applications where 14-bit or 16-bit performance is not strictly required.

Digital To Analog Converters Replacement Considerations

For pin-compatible upgrades within the same family, consider the AD9776A (12-bit, 1 GSPS) or AD9778 (14-bit, 1 GSPS). These devices maintain the 80-TQFP-EP package and SPI interface but offer higher conversion speeds. Ensure that the host processor can support the increased data throughput if upgrading to a faster member of the family.