DAC5670

www.ti.com

SGLS394 – MARCH 2010

14-BIT 2.4-GSPS DIGITAL-TO-ANALOG CONVERTER

Check for Samples: DAC5670

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FEATURES

•

Differential Scalable Current Outputs:

5 mA to 30 mA

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•

14-Bit Resolution

•

On-Chip 1.2-V Reference

•

2.4-GSPS Maximum Update Rate Digital to

Analog Converter

•

3.3-V Analog Supply Operation

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Dual Differential Input Ports

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Power Dissipation: 2 W

–

Even/Odd Demultiplexed Data

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252-Ball GDJ Package

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Maximum 1.2 GSPS Each Port, 2.4 GSPS

APPLICATIONS

Total

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Cable Modem Termination System Direct

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Dual 14-Bit Inputs + 1 Reference Bit

Synthesis

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DDR Output Clock

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Cellular Base Transceiver Station Transmit

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DLL Optimized Clock Timing Synchronized

Channels

to Reference Bit

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CDMA: W-CDMA, CDMA2000, TD-SCDMA

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LVDS and HyperTransport™ Voltage Level

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800 to 900-MHz Direct Synthesis

Compatible

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Point-to-Point Microwave

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Internal 100-

Ω Terminations for Data and

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Radar

Reference Bit Inputs

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Satellite Communications

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Selectable 2 Times Interpolation With Fs/2

Mixing

DESCRIPTION

The DAC5670 is a 14-bit 2.4-GSPS digital-to-analog converter (DAC) with dual demultiplexed differential input

ports. The DAC5670 is clocked at the DAC sample rate and the two input ports run at a maximum of 1.2 GSPS.

An additional reference bit input sequence is used to adjust the output clock delay to the data source, optimizing

the internal data latching clock relative to this reference bit with a delay lock loop (DLL).

The DAC5670 also can accept data up to 1.2 GSPS on one input port the same clock configuration. In the single

port mode, repeating the input sample (A_ONLY mode), 2 times interpolation by zero stuff (A_ONLY_ZS mode),

or 2 times interpolation by repeating and inverting the input sample (A_ONLY_INV) are used to double the input

sample rate up to 2.4 GSPS.

The DAC5670 operates with a single 3-V to 3.6-V supply voltage. Power dissipation is 2 W at maximum

operating conditions. The DAC5670 provides a nominal full-scale differential current-output of 20 mA, supporting

both single-ended and differential applications. An on-chip 1.2-V temperature-compensated bandgap reference

and control amplifier allows the user to adjust the full-scale output current from the nominal 20 mA to as low as 5

mA or as high as 30 mA. The output current can be directly fed to the load with no additional external output

buffer required. The device has been specifically designed for a differential transformer coupled output with a

50-

Ω doubly-terminated load.

The DAC5670 is available in a 252-ball GDKJ package. The device is characterized for operation over the

temperature range –40°C to 85°C .

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.