AD9747:  Dual 16-Bit 250 MSPS Digital-to-Analog Converters

The AD9741/AD9743/AD9745/AD9746/AD9747 are pin-compatible, high dynamic range, dual digital-to-analog converters (DACs) with 8-/10-/12-/ 14-/16-bit resolutions and sample rates of up to 250 MSPS. ...More

AD9747:  Dual 16-Bit 250 MSPS Digital-to-Analog Converters

Product Description

The AD9741/AD9743/AD9745/AD9746/AD9747 are pin-compatible, high dynamic range, dual digital-to-analog converters (DACs) with 8-/10-/12-/ 14-/16-bit resolutions and sample rates of up to 250 MSPS. The devices include specific features for direct conversion transmit applications, including gain and offset compensation, and they interface seamlessly with analog quadrature modulators, such as the ADL5370.

A proprietary, dynamic output architecture permits synthesis of analog outputs even above Nyquist by shifting energy away from the fundamental and into the image frequency.

Full programmability is provided through a serial peripheral interface (SPI) port. In addition, some pin-programmable features are offered for those applications without a controller.

Product Highlights

  1. Low noise and intermodulation distortion (IMD) enables high quality synthesis of wideband signals.
  2. Proprietary switching output for enhanced dynamic performance.
  3. Programmable current outputs and dual auxiliary DACs provide flexibility and system enhancements.

Applications

  • Wireless infrastructure:
    WCDMA, CDMA2000, TD-SCDMA, WiMAX
  • Wideband communications:
    LMDS/MMDS, point-to-point
  • Instrumentation:
    RF signal generators, arbitrary waveform generators

Features

  • High dynamic range, dual DACs
  • Low noise and intermodulation distortion
  • Single carrier WCDMA ACLR = 80 dBc @ 61.44 MHz IF
  • Innovative switching output stage permits useable outputs beyond Nyquist frequency
  • LVCMOS inputs with dual-port or optional interleaved single-port operation
  • Differential analog current outputs are programmable from 8.6 mA to 31.7 mA full scale
  • Auxiliary 10-bit current DACs with source/sink capability for external offset nulling
  • Internal 1.2 V precision reference voltage source
  • Operates from 1.8 V and 3.3 V supplies
  • 315 mW power dissipation
  • Small footprint, Pb-free, 72-Lead LFCSP

Diagrams

AD9747 Diagram
Functional Block Diagram for AD9747

Specifications

Resolution (Bits) 16bit
DAC Update Rate 250MSPS
DAC Settling Time n/a
# DAC Outputs 6
DAC Type Current Out
DAC Input Format Par
Output FSR Adj(FS Current)
Ref Int/Ext Int/Ext
Supply Vnom Multi(+1.8, +3.3)
Pwr Diss (Max) 355mW
Package CSP

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Part# Res (bits) Update Rate Settling Time # Outputs
AD9747 16 250MSPS - 6
AD9788 16 800MSPS - 4
AD9746 14 250MSPS - 6
AD9777 16 400MSPS 11ns 2
AD9783 16 600MSPS - 2
AD9779 16 1GSPS - 2
AD9779A 16 1GSPS - 2