The AD9776A/AD9778A/AD9779A are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting a multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmit applications, including complex digital modulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quadrature modulators such as the ADL537x FMOD series from Analog Devices, Inc. A serial peripheral interface (SPI) pro-vides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The devices are manufactured on an advanced 0.18 μm CMOS process and operate on 1.8 V and 3.3 V supplies for a total power consumption of 1.0 W. They are enclosed in a 100-lead TQFP.

The AD9776A, AD9778A, AD9779A are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting a multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmit applications, including complex digital modulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quadrature modulators such as the ADL537x FMOD series from Analog Devices, Inc. A serial peripheral interface (SPI) provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The devices are manufactured on an advanced 0.18 μm CMOS process and operate on 1.8 V and 3.3 V supplies for a total power consumption of 1.0 W. They are enclosed in a 100-lead TQFP.

Product Highlights

1. Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.
2. A proprietary DAC output switching technique enhances dynamic performance.
3. The current outputs are easily configured for various single-ended or differential circuit topologies.
4. CMOS data input interface with adjustable setup and hold.
5. Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth.

Applications

• Wireless infrastructure: W-CDMA, CDMA2000, TD-SCDMA, WiMax, GSM
• Digital high or low IF synthesis
• Internal digital upconversion capability
• Transmit diversity
• Wideband communications: LMDS/MMDS, point-to-point

Data Sheet, Rev. A, 3/08

Part#	Res (bits)	Update Rate	Settling Time	# Outputs
AD9778A	14	1GSPS	-	2
AD9778	14	1GSPS	-	2
AD9736	14	1.2GSPS	-	1
AD9779	16	1GSPS	-	2
AD9779A	16	1GSPS	-	2
AD9776A	12	1GSPS	-	2
AD9781	14	600MSPS	-	2
AD9775	14	400MSPS	11ns	2
AD9767	14	125MSPS	35ns	2
AD5555	14	2MSPS	500ns	2
AD5557	14	2MSPS	500ns	2

The model number is a specific version of a generic that can be purchased or sampled.

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• Pre-Release: The model has not been released to general production, but samples may be available.
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The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

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• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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