The AD9708 belongs to the TxDAC™ family of high performance, low power CMOSDigital-to-analog converters(DAC) 8-bit resolution product. The TxDAC™ family consists of pin-compatible 8-, 10-, 12-, and 14-bit DACs optimized for the transmit signal path of communication systems. All devices share the same interface options, small packages, and pinouts, allowing you to go up or down to select the right device based on performance, resolution, and cost. The AD9708 provides excellent ac and dc performance while supporting update rates up to 125 MSPS.
The flexible single-supply operating voltage range (2.7 V to 5.5 V) and low power consumption of the AD9708 make it ideal for portable and low power applications. By reducing the full-scale current output, the power dissipation can be further reduced to 45 mW without significant performance degradation. In addition, standby power consumption can be reduced to approximately 20 mW in power-down mode.
The AD9708 is manufactured using an advanced CMOS process. The segmented current source architecture, combined with proprietary switching technology, reduces spurious components and enhances dynamic performance. The device also integrates edge-triggered input latches and a temperature-compensated bandgap reference, providing a complete monolithic DAC solution. Flexible power 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 an output impedance greater than 100 kΩ.
It provides differential current outputs to support single-ended or differential applications. The current output can be connected directly to an output resistor to provide two complementary single-ended voltage outputs. The compatible output voltage range is 1.25 V.
The AD9708 contains an on-chip 1.2 V reference and reference control amplifier that makes it easy to set the full-scale output current with a single resistor. The device can be driven with a variety of external references. Its full-scale current can be adjusted from 2 mA to 20 mA without compromising dynamic performance. As a result, the AD9708 can operate at low power levels or be adjusted in the 20 dB range, further providing gain range adjustment.
The AD9708 is available in a 28-lead SOIC package and is specified over the industrial temperature range.