PRODUCT DESCRIPTION
The AD9761 is a complete dual-channel, high speed, 10-bit CMOS DAC. The AD9761 has been developed specifcally for use in wide bandwidth communication applications (e.g., spread spectrum) where digital I and Q information is being processed during transmit operations. It integrates two 10-bit, 40 MSPS DACs, dual 2x interpolation flters, a voltage reference, and digi tal input interface circuitry. The AD9761 supports a 20 MSPS per channel input data rate that is then interpolated by 2x up to 40 MSPS before simultaneously updating each DAC.
The interleaved I and Q input data stream is presented to the digital interface circuitry, which consists of I and Q latches as well as some additional control logic. The data is de-interleaved back into its original I and Q data. An on-chip state machine ensures the proper pairing of I and Q data. The data output from each latch is then processed by a 2x digital interpolation flter that eases the reconstruction flter requirements. The interpolated output of each flter serves as the input of their respective 10-bit DAC.

FEATURES
   Complete 10-Bit, 40 MSPS Dual Transmit DAC
   Excellent Gain and Offset Matching
   Differential Nonlinearity Error: 0.5 LSB
   Effective Number of Bits: 9.5
   Signal-to-Noise and Distortion Ratio: 59 dB
   Spurious-Free Dynamic Range: 71 dB
   2x Interpolation Filters
   20 MSPS/Channel Data Rate
   Single Supply: 3 V to 5.5 V
   Low Power Dissipation: 93 mW (3 V Supply @
      40 MSPS)
   On-Chip Reference
   28-Lead SSOP