The AD9708 is the 8-bit resolution member of the TxDAC series of high performance， low power CMOS digital-to-analog converters （DACs）。 The TxDAC family， which consists of pin compatible 8-， 10-， 12-， and 14-bit DACs， was specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options， small outline package and pinout， thus providing an upward or downward component selection path based on performance， resolution and cost. The AD9708 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS. The AD9708’s flexible single-supply operating range of +2.7 V to +5.5 V and low power dissipation are well suited for portable and low power applications. Its power dissipation can be further reduced to 45 mW， without a significant degradation in performance， by lowering the full-scale current output. In addition， a power-down mode reduces the standby power dissipation to approximately 20 mW. The AD9708 is manufactured on an advanced CMOS process. A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Edge-triggered input latches and a temperature compensated bandgap reference have been integrated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families. The AD9708 is a current-output DAC with a nominal full-scale output current of 20 mA and 》 100 k? output impedance. TxDAC is a registered trademark of Analog Devices， Inc.