Alternative Parts
Overview
Features and Benefits
- 16-bit resolution, 160 MSPS/400 MSPS input/output data rate
- Selectable 2×/4×/8× interpolating filter
- Programmable channel gain and offset adjustment
- fS/4, fS/8 digital quadrature modulation capability
- Fully compatible SPI® port
- Direct IF transmission mode for 70 MHz + IFs
- Enables image rejection architecture
- See datasheet for additional features
Product Details
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.
APPLICATIONS
- Communications
- Analog quadrature modulation architecture
- 3G, multicarrier GSM, TDMA, CDMA systems
- Broadband wireless, point-to-point microwave radios
- Instrumentation/ATE
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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AN-237: Choosing DACs for Direct Digital Synthesis2/14/2015PDF1156 kB
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AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters (Rev. 0)2/14/2015PDF36 kB
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AN-748: Set-Up and Hold Measurements in High Speed CMOS Input DACs (Rev. 0)2/14/2015PDF812 kB
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AN-642: Coupling a Single-Ended Clock Source to the Differential Clock Input of Third-Generation TxDAC® and TxDAC+® Products (Rev. 0)2/14/2015PDF479 kB
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AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0)11/9/2007PDF1535 kB
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AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (Rev. 0)5/21/2007PDF246 kB
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AN-320B: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifiers, Part 210/15/2004PDF989 kB
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AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 110/15/2004PDF1295 kB
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AN-640: Synchronizing Multiple AD9777s Using DATACLK Input Mode (Rev. 0)2/27/2003PDF0
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AN-137: A Digitally Programmable Gain and Attenuation Amplifier Design9/26/2002PDF52 kB
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AN-302: Exploit Digital Advantages in an SSB Receiver1/1/2000PDF417 kB
Product Recommendations
AD9777 Companion Parts
Recommended Quadrature Modulators
- For an IQ modulator with integrated PLL and VCO: ADRF6701, ADRF6702, ADRF6703, ADRF6704.
- For 3V power supplies: AD8345, AD8346.
- In wideband communication systems: ADL5370, ADL5371, ADL5372, ADL5373, ADL5374, ADL5375, AD8349, ADL5385, ADL5386.
Recommended Clock Drivers
Recommended I/V Amplifiers
- For a high speed, ouput amplifier: AD8021, ADA4899-1, ADA4897-1.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Sample & Buy
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