The AD9745 is pin-compatible, high dynamic range, dual digital-to-analog converter (DACs) with 12-bit resolutions and sample rates of up to 250 MSPS. The devices include specific features for direct conversion transmit applications, including gain and offset compensation and they interface seamlessly with analog quadrature modulators, such as the ADL5370.
A proprietary, dynamic output architecture permits synthesis of analog outputs even above Nyquist by shifting energy away from the fundamental and into the image frequency.
Full programmability is provided through a serial peripheral interface (SPI) port. In addition, some pin-programmable features are offered for those applications without a controller.
- High dynamic range, dual DACs
- Low noise and intermodulation distortion
- Single carrier WCDMA ACLR = 80 dBc @ 61.44 MHz IF
- Innovative switching output stage permits useable outputs beyond Nyquist frequency
- LVCMOS inputs with dual-port or optional interleaved single-port operation
- Small footprint, Pb-free, 72-Lead LFCSP
- Differential analog current outputs are programmable from 8.6 mA to 31.7 mA full scale
- Auxiliary 10-bit current DACs with source/sink capability for external offset nulling
- Internal 1.2 V precision reference voltage source
- Operates from 1.8 V and 3.3 V supplies
- 315mW power dissipation
- Applications:
- Wireless infrastructure: WCDMA, CDMA2000, TD-SCDMA, WiMAX
- Wideband communications: LMDS/MMDS, point-to-point
- Instrumentation: RF signal generators, arbitrary waveform generators
