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.
|Title||Content Type||File Type|
|AD9777: 16-Bit 160 MSPS 2x/4x/8x Interpolating Dual TxDAC+® D/A Converter Data Sheet (Rev C, 01/2006) (pdf, 1770 kB)||Data Sheets|
AN-808: Multicarrier CDMA2000 Feasibility
(pdf, 1535 kB)
The goal of this application note is to determine the feasibility of implementing a multicarrier CDMA2000 transceiver and what the major subsystem performances must be.
|AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (pdf, 246 kB)||Application Notes|
|AN-748: Set-Up and Hold Measurements in High Speed CMOS Input DACs (pdf, 812 kB)||Application Notes|
|AN-320B: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifiers, Part 2 (pdf, 989 kB)||Application Notes|
|AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 1 (pdf, 1295 kB)||Application Notes|
|AN-642: Coupling a Single-Ended Clock Source to the Differential Clock Input of Third-Generation TxDAC® and TxDAC+® Products (pdf, 479 kB)||Application Notes|
|AN-640: Synchronizing Multiple AD9777s Using DATACLK Input Mode (pdf, 0)||Application Notes|
|AN-237: Choosing DACs for Direct Digital Synthesis (pdf, 1156 kB)||Application Notes|
|AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters (pdf, 36 kB)||Application Notes|
|AN-137: A Digitally Programmable Gain and Attenuation Amplifier Design (pdf, 52 kB)||Application Notes|
|AN-302: 02: Exploit Digital Advantages in an SSB Receiver (pdf, 417 kB)||Application Notes|
|Digital to Analog Converters ICs Solutions Bulletin (pdf)||Solutions Bulletins|
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
|Title||Content Type||File Type|
AD9777 DAC Harmonic Analyzer
This tool displays harmonic images and spurs in a DAC output. The user can define a post-DAC analog filter to suppress these images. The effect of this filter is plotted on the graph and shown in the accompanying chart.
|DAC Harmonic Analyzer||HTML|
|AD9777 IBIS Models||IBIS Models||HTML|
Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.
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