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DAC5686IPZP Datenblatt(PDF) 1 Page - Texas Instruments

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Teilenummer DAC5686IPZP
Bauteilbeschribung  16-BIT, 500-MSPS, 2X16X INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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FEATURES
APPLICATIONS
DESCRIPTION
DAC5686
SLWS147B – APRIL 2003 – REVISED AUGUST 2004
16-BIT, 500-MSPS, 2
×–16× INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG
CONVERTER
On-Chip 1.2-V Reference
500 MSPS Maximum Update Rate DAC
1.8-V Digital and 3.3-V Analog Supplies
WCDMA ACPR
1.8-V/3.3-V CMOS Compatible Interface
– 1 Carrier: 76 dB Centered at 30.72-MHz IF,
Power Dissipation: 950 mW at Full Maximum
245.76 MSPS
Operating Conditions
– 1 Carrier: 73 dB Centered at 61.44-MHz IF,
Package: 100-Pin HTQFP
245.76 MSPS
– 2 Carrier: 72 dB Centered at 30.72-MHz IF,
245.76 MSPS
Cellular Base Transceiver Station Transmit
Channel
– 4 Carrier: 64 dB Centered at 92.16-MHz IF,
– CDMA: W-CDMA, CDMA2000, IS-95
491.52 MSPS
– TDMA: GSM, IS-136, EDGE/UWC-136
Selectable 2
×, 4×, 8×, and 16× Interpolation
Baseband I and Q Transmit
– Linear Phase
Input Interface: Quadrature Modulation for
– 0.05-dB Pass-Band Ripple
Interfacing With Baseband Complex Mixing
– 80-dB Stop-Band Attenuation
ASICs
– Stop-Band Transition 0.4–0.6 fDATA
Single-Sideband Up-Conversion
32-Bit Programmable NCO
Diversity Transmit
On-Chip 2
×–16× PLL Clock Multiplier With
Cable Modem Termination System
Bypass Mode
Differential Scalable Current Outputs: 2 mA to
20 mA
The DAC5686 is a dual-channel 16-bit high-speed digital-to-analog converter (DAC) with integrated 2
×, 4×, 8×,
and 16
× interpolation filters, a numerically controlled oscillator (NCO), onboard clock multiplier, and on-chip
voltage reference. The DAC5686 has been specifically designed to allow for low input data rates between the
DAC and ASIC, or FPGA, and high output transmit intermediate frequencies (IF). Target applications include
high-speed digital data transmission in wired and wireless communication systems and high-frequency
direct-digital synthesis DDS.
The DAC5686 provides three modes of operation: dual-channel, single-sideband, and quadrature modulation. In
dual-channel mode, interpolation filtering increases the DAC update rate, which reduces sinx/x rolloff and
enables the use of relaxed analog post-filtering.
Single-sideband mode provides an alternative interface to the analog quadrature modulators. Channel carrier
selection is performed at baseband by mixing in the ASIC/FPGA. Baseband I and Q from the ASIC/FPGA are
input to the DAC5686, which in turn performs a complex mix resulting in Hilbert transform pairs at the outputs of
the DAC5686's two DACs. An external RF quadrature modulator then performs the final single-sideband
up-conversion. The DAC5686's complex mixing frequencies are flexibly chosen with the 32-bit programmable
NCO.
Unmatched gains and offsets at the RF quadrature modulator result in unwanted sideband and local oscillator
feedthrough. Each DAC in the DAC5686 has an 11-bit offset adjustment and 12-bit gain adjustment, which
compensate for quadrature modulator input imbalances, thus reducing RF filtering requirements.
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.
PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2003–2004, 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.


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