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DAC5687 Datasheet(PDF) 1 Page - Texas Instruments |
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DAC5687 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 80 page  1 FEATURES DESCRIPTION APPLICATIONS DAC5687 SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006 www.ti.com 16-BIT, 500 MSPS 2 ×–8× INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC) 2345 • 500 MSPS The DAC5687 is a dual-channel 16-bit high-speed digital-to-analog converter (DAC) with integrated 2 ×, • Selectable 2×–8× Interpolation 4 ×, and 8× interpolation filters, a complex numerically • On-Chip PLL/VCO Clock Multiplier controlled oscillator (NCO), onboard clock multiplier, • Full IQ Compensation Including Offset, Gain, IQ compensation, and on-chip voltage reference. The and Phase DAC5687 is pin-compatible to the DAC5686, • Flexible Input Options: requiring only changes in register settings for most – FIFO With Latch on External or Internal applications, and offers additional features and Clock superior linearity, noise, crosstalk, and PLL phase noise performance. – Even/Odd Multiplexed Input The DAC5687 has six signal processing blocks: two – Single Port Demultiplexed Input interpolate-by-two digital filters, a fine frequency • Complex Mixer With 32-Bit NCO mixer with 32-bit NCO, a quadrature modulation • Fixed Frequency Mixer With f S/4 and fS/2 compensation block, another interpolate-by-two digital • 1.8-V or 3.3-V I/O Voltage filter, and a coarse frequency mixer with fS/2 or fS/4. The different modes of operation enable or bypass • On-Chip 1.2-V Reference the signal processing blocks. • Differential Scalable Output: 2 mA to 20 mA The coarse and fine mixers can be combined to span • Pin Compatible to DAC5686 a wider range of frequencies with fine resolution. The • High Performance DAC5687 allows both complex or real output. – 81-dBc ACLR WCDMA TM1 at 30.72 MHz Combining the frequency upconversion and complex output produces a Hilbert transform pair that is output – 72-dBc ACLR WCDMA TM1 at 153.6 MHz from the two DACs. An external RF quadrature • Package: 100-Pin HTQFP modulator then performs the final single-sideband upconversion. The IQ compensation feature allows optimization of • Cellular Base Transceiver Station Transmit phase, gain, and offset to maximize sideband Channel rejection and minimize LO feedthrough for an analog – CDMA: W-CDMA, CDMA2000, TD-SCDMA quadrature modulator. – TDMA: GSM, IS-136, EDGE/UWC-136 The DAC5687 includes several input options: – OFDM: 802.16 single-port interleaved data, even and odd • Cable Modem Termination System multiplexing at half-rate, and an input FIFO with either external or internal clock to ease the input timing ambiguity when the DAC5687 is clocked at the DAC output sample rate. ORDERING INFORMATION TA Package Device 100 HTQFP(1) (PZP) PowerPAD™ package, plastic quad flatpack –40 °C to 85°C DAC5687IPZP (1) Thermal pad size: 6 mm × 6 mm. 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. 2 PowerPAD is a trademark of Texas Instruments. 3 Excel is a trademark of Microsoft Corporation. 4 Matlab is a trademark of The MathWorks, Inc. 5 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2006, 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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