AD9777:  16-Bit 160 MSPS 2x/4x/8x Interpolating Dual TxDAC+® D/A Converter

The AD9777 is the 16-bit member of a new pin-compatible family of high-speed dual Interpolating TxDAC+® converters with a maximum input data rate of 160 MSPS (no interpolation) and maximum DAC ...More

AD9777:  16-Bit 160 MSPS 2x/4x/8x Interpolating Dual TxDAC+® D/A Converter

Product Description

The AD9777 is the 16-bit member of a new pin-compatible family of high-speed dual Interpolating TxDAC+® converters with a maximum input data rate of 160 MSPS (no interpolation) and maximum DAC update rate of 400 MSPS (8x interpolation). They feature a selectable interpolation rate (2x/4x/8x) and a complex modulator that can mix at Fs/2, Fs/4 or Fs/8. All configuration is accomplished through an easy to use 3- or 4-wire SPI interface.

When used with an external quadrature modulator (such as the AD8345/AD8346/AD8349) the AD977X can be used implement a more traditional baseband I/Q architecture or an image reject upconversion architecture by using its internal complex (I&Q) mixer. The latter architecture may be well suited for those applications demanding high modulation accuracy (i.e. 64 QAM) that digital modulation inherently provides. This offers the added benefit of suppressing the image inherent in an analog mixing operation, consequently reducing the number of filtering stages, and therefore the cost of the hardware required to achieve 3G and broadband spectral emission specifications. User-accessible Gain and Offset correction is accessed through the SPI port and improves sideband suppression and LO feedthrough, respectively. A direct IF mode allows synthesis of intermediate frequencies (IFs) above 70 MHz.

TxDAC+ is a registered trademark of Analog Devices, Inc.

Features

  • Novel Complex Modulator Enables Single-Sideband Architecture, Reducing Radio Cost and Complexity
  • User-Accessible Gain and Offset Correction Enhances System Performance
  • Selectable Interpolation Rate (1x/2x/4x/8x), Modulation Modes, Data Format Increases Flexibility
  • WCDMA ACLR of 71 dBc at 71 MHz IF
    IMD of -80 dBc up to 30 MHz output frequency
  • 80-lead, Thermally-Enhanced TQFP Package

Diagrams

AD9777 Diagram
Functional Block Diagram for AD9777

Specifications

Resolution (Bits) 16bit
DAC Update Rate 400MSPS
DAC Settling Time 11ns
# DAC Outputs 2
DAC Type Current Out
DAC Input Format Par
Output FSR (Iout x Rload),Adj(Uni 2mA to Uni 20mA),User Def. Range/Offset
Ref Int/Ext Int/Ext
Supply Vnom Single(+3.3)
Pwr Diss (Max) 410mW
Package QFP

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AD5025 - Fully Accurate 12-Bit VOUT DAC SPI Interface 2.7 V to 5.5 V in a TSSOP

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Part# Res (bits) Update Rate Settling Time # Outputs
AD9777 16 400MSPS 11ns 2
AD9775 14 400MSPS 11ns 2
AD9773 12 400MSPS 11ns 2
AD9783 16 600MSPS - 2
AD9779 16 1GSPS - 2
AD9779A 16 1GSPS - 2
AD9726 16 400MSPS - 1