AD9778BSVZ

Digital To Analog Converters Overview

The AD9778BSVZ is a dual-channel, 14-bit digital-to-analog converter (DAC) from Analog Devices, operating at a maximum sample rate of 1 GSPS. It features an internal reference voltage and supports CMOS data interfaces with adjustable setup and hold times. The device operates on 3.3 V analog/digital supplies and 1.8 V clock/digital supplies, consuming approximately 1.0 W at full speed. Key specifications include a typical SFDR of 78 dBc up to 100 MHz output frequency and a single-carrier WCDMA ACLR of 79 dBc at 80 MHz IF. It is housed in a 100-lead TQFP package.

Digital To Analog Converters Feature Summary

• Dual 14-bit DAC architecture with 1 GSPS sampling rate
• Integrated 2x, 4x, and 8x interpolator/coarse complex modulator
• Internal reference voltage and programmable full-scale current (8.7 mA to 31.7 mA)
• Digital inverse sinc filter and high-performance PLL clock multiplier

Digital To Analog Converters Applications

• Wireless infrastructure base stations
• WCDMA, CDMA2000, TD-SCDMA, WiMax, and GSM systems
• Digital high or low IF synthesis
• Transmit diversity applications

Digital To Analog Converters Procurement Notes

Verify the specific suffix 'BSVZ' against the manufacturer's ordering guide to confirm package type and temperature range. Ensure compatibility with the required supply voltages (AVDD33/DVDD33 at 3.3 V and CVDD18/DVDD18 at 1.8 V). Check for moisture sensitivity levels and storage requirements prior to assembly.

Digital To Analog Converters Selection Notes

Select the AD9778BSVZ when a 14-bit resolution is required for dual-channel transmission paths. Compare dynamic performance metrics such as SFDR and IMD against system noise floors. Consider the power consumption of 1.0 W at 1 GSPS for thermal management design within the 100-lead TQFP enclosure.

Digital To Analog Converters Part Context

The AD9778 belongs to the AD9776/AD9778/AD9779 family of high-speed DACs. While sharing identical pinouts and functional blocks, the series differentiates by resolution: 12-bit (AD9776), 14-bit (AD9778), and 16-bit (AD9779). This allows designers to scale performance and cost based on bit-depth requirements without changing the PCB layout.

Digital To Analog Converters Replacement Considerations

The AD9776A and AD9779A are functionally similar devices within the same datasheet but offer 12-bit and 16-bit resolutions respectively. They share the same package and pinout, allowing for potential pin-compatible substitution if resolution adjustments are acceptable.