The AD9709 is a dual-port, high speed, 2-channel, 8-bit CMOS DAC. It integrates two high quality 8-bit TxDAC+ cores, a voltage reference, and digital interface circuitry into a small 48-lead LQFP package. The AD9709 offers exceptional ac and dc performance while supporting update rates of up to 125 MSPS.
The AD9709 has been optimized for processing I and Q data in communications applications. The digital interface consists of two double-buffered latches as well as control logic. Separate write inputs allow data to be written to the two DAC ports independent of one another. Separate clocks control the update rate of the DACs.
A mode control pin allows the AD9709 to interface to two separate data ports, or to a single interleaved high speed data port. In interleaving mode, the input data stream is demuxed into its original I and Q data and then latched. The I and Q data is then converted by the two DACs and updated at half the input data rate.
- 8-bit dual transmit digital-to-analog converter (DAC)
- 125 MSPS update rate
- Excellent SFDR to Nyquist at 5MHz output of 66 dBc
- Excellent gain and offset matching of 0.1%
- Fully independent or single-resistor gain control
- Dual port or interleaved data
- On-chip 1.2V reference
- Complete CMOS dual DAC function operates at 380mW from a 3.3V or 5V single supply
- Includes a 1.20V temperature-compensated band gap voltage reference
- Flexible dual-port interface, allowing dual or interleaved input data
- Applications:
- Communications
- Base stations
- Digital synthesis
- Quadrature modulation
- 3D ultrasound
