DAC5670-SP Datasheet, PDF (1/30 Pages) Texas Instruments – 14-BIT 2.4-GSPS DIGITAL-TO-ANALOG CONVERTER

DAC5670-SP
www.ti.com
SGLS386A – JANUARY 2009 – REVISED DECEMBER 2009
14-BIT 2.4-GSPS DIGITAL-TO-ANALOG CONVERTER
Check for Samples: DAC5670-SP
FEATURES
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•2 14-Bit Resolution
• 2.4-GSPS Maximum Update Rate Digital to
Analog Converter
• Dual Differential Input Ports
– Even/Odd Demultiplexed Data
– Maximum 1.2 GSPS Each Port, 2.4 GSPS
Total
– Dual 14-Bit Inputs + 1 Reference Bit
– DDR Output Clock
– DLL Optimized Clock Timing Synchronized
to Reference Bit
– LVDS and HyperTransport™ Voltage Level
Compatible
– Internal 100-Ω Terminations for Data and
Reference Bit Inputs
• Selectable 2 Times Interpolation With Fs/2
Mixing
• Differential Scalable Current Outputs:
5 mA to 30 mA
• On-Chip 1.2-V Reference
• 3.3-V Analog Supply Operation
• Power Dissipation: 2 W
• 192-Ball CBGA (GEM) Package
• QML-V Qualified, SMD 5962-07247
• Military Temperature Range
(-55°C to 125°C T_case )
APPLICATIONS
• Cable Modem Termination System Direct
Synthesis
• Cellular Base Transceiver Station Transmit
Channels
– CDMA: W-CDMA, CDMA2000, TD-SCDMA
– 800 to 900-MHz Direct Synthesis
• Point-to-Point Microwave
• Radar
• Satellite Communications
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 192-ball CBGA package. The device is characterized for operation over the
military temperature range ( –55°C to 125°C T_case).
1
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.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated