AD9709AST

The AD9709AST is a type of dual-port, high-speed, two-channel, 8-bit CMOS DAC,which combines two high-quality 8-bit TxDAC+cores, a voltage reference, and digital interface circuitry into a small 48-lead LQFP package. The AD9709 AST  provides exceptional ac and dc performance when supporting update rates reach 125 MSPS.The AD9709AST ha s been optimized for processing I and Q data in communications applications. The digital interface including two do uble-buffered latches as well as control logic. Separate write inputs accept data to be written to the two DAC ports independent of one another. Separate clocks control the update rate of the DACs.

Features of the  AD9709AST are:(1)8-bit dual transmit DAC;(2)125 MSPS update rate;(3)excellent SFDR to nyquist @ 5 MHz output = 66 dBc;(4)excellent gain and offset matching: 0.1%;(5)fully independent or single resistor gain cont rol;(6)dual port or interleaved data;(7)on-chip 1.2 V reference;(8)power dissipation is 380 mW @ 5 V,power-down mode is 50 mW @ 5 V;(9)48-lead LQFP.

The absolute maximum ratings and specifications of the AD9709AST can be summarized as:(1):AVDD is0.3V min and +6.5 V max;(2):DVDD DCOM is0.3 V min and+6.5 V max;(3):ACOM is 0.3 V min and +0.3 V max;(4):AVDDis6.5V min and +6.5 V max;(5)MODE, CLK1, CLK2, WRT1, WRT2 is0.3V min and DVDD + 0.3 V max;(6):digital inputs is0.3V min and DVDD + 0.3 V max;(7):IOUTA1/IOUTA2, IOUTB1/IOUTB2 is1.0V min and AVDD + 0.3 V max;(8):REFIO, FSADJ1, FSADJ2 is0.3V min and AVDD + 0.3 V max.specifications:(1):integral linearity error (INL) is0.5LSB min, ±0.1LSB typ and +0.5 LSB max;(2):differential nonlinearity (DNL) is0.5LSB min,±0.1LSB typ and +0.5 LSB max;(3): gain error (without internal reference) is2 % of FSR min,±0.25 % of FSR typ and +2 % of FSR max;(4):output compliance range is1.0 V min and +1.25 V max;(5):reference voltage is 1.14V min, 1.20V typ and 1.26 V max;(6):input compliance range is 0.1V min and 1.25 V max.