AD9778BSVZ

The AD9778BSVZ from Analog Devices is a high-performance dual 14-bit digital-to-analog converter (DAC) designed for demanding applications. It supports a sample rate of up to 1 GSPS, enabling multicarrier generation up to the Nyquist frequency. This DAC is optimized for direct conversion transmit applications, featuring complex digital modulation capabilities, gain, and offset compensation.

Key electrical specifications include a low power consumption of 1.0 W at 1 GSPS, an SFDR of 78 dBc to fOUT = 100 MHz, and an ACLR of 79 dBc for WCDMA signals. The analog output current is adjustable from 8.7 mA to 31.7 mA, and the full-scale output current can be programmed from 10 mA to 30 mA. It operates on 1.8 V and 3.3 V supplies.

Designed with a novel 2x, 4x, and 8x interpolator/coarse complex modulator, the AD9778BSVZ allows flexible carrier placement anywhere within the DAC bandwidth. It includes auxiliary DACs for external VGA and offset control, and a multiple chip synchronization interface. The device is manufactured on an advanced 0.18 μm CMOS process.

Packaged in a 100-lead exposed paddle TQFP, the AD9778BSVZ is suitable for surface mount applications. Its architecture is an oversampling interpolating DAC, and it features a parallel data interface. This component is well-suited for wireless infrastructure applications such as WCDMA, CDMA2000, TD-SCDMA, WiMax, and GSM, as well as digital high or low IF synthesis and wideband communications.