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DAC5687 Fiches technique(PDF) 1 Page - Texas Instruments |
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DAC5687 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 72 page www.ti.com FEATURES DESCRIPTION APPLICATIONS DAC5687 SLWS164B – FEBRUARY 2005 – REVISED JUNE 2005 16-BIT, 500 MSPS 2x-8x INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC) • 500 MSPS The DAC5687 is a dual-channel 16-bit high-speed digital-to-analog converter (DAC) with integrated 2x, • Selectable 2x-8x Interpolation 4x, and 8x interpolation filters, a complex numerically • On-Chip PLL/VCO Clock Multiplier controlled oscillator (NCO), on-board 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, requir- ing only changes in register settings for most appli- • Flexible Input Options: cations, and offers additional features and superior – FIFO With Latch on External or Internal linearity, noise, crosstalk, and PLL phase noise per- Clock formance. – Even/Odd Multiplexed Input The DAC5687 has six signal processing blocks: two – Single Port Demultiplexed Input interpolate by two digital filters, fine frequency mixer • Complex Mixer With 32-Bit NCO with 32-bit NCO, a quadrature modulation compen- sation block, another interpolate by two digital filter • Fixed Frequency Mixer With Fs/4 and Fs/2 and a coarse frequency mixer with Fs/2 or Fs/4. The • 1.8-V or 3.3-V I/O Voltage different modes of operation enable or bypass the • On-Chip 1.2-V Reference 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 DAC5687 allows both complex or real output. Com- • High Performance bining the frequency upconversion and complex out- – 81-dBc ACLR WCDMA TM1 at 30.72 MHz put 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 modulator then performs the final single sideband • Package: 100-Pin HTQFP up-conversion. The IQ compensation feature allows optimization of • Cellular Base Transceiver Station Transmit phase, gain and offset to maximize sideband rejection Channel and minimize LO feedthrough for an analog quadra- ture modulator. – CDMA: W-CDMA, CDMA2000, TD-SCDMA – TDMA: GSM, IS-136, EDGE/UWC-136 The DAC5687 includes several input options: single port interleaved data, even and odd multiplexing at – OFDM: 802.16 half rate, and an input FIFO with either external or • Cable Modem Termination System 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) (P&P) PowerPAD™ Plastic Quad FlatPack -40°C to 85°C DAC5687IPZP (1) Thermal Pad Size: 6 mm × 6 mm. 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. PRODUCTION DATA information is current as of publication date. Copyright © 2005, 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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