Texas Instruments DAC5686 overview
16-bit, 500-msps, 2x16x Interpolating Dual-channel Digital-to-analog Converter Texas Instruments DAC5686 Interpolating Dual Channel Digital-to-Analog Converter ...
Product details
Manufactured byTexas Instruments
Product groupModules
Description16-bit, 500-msps, 2x16x Interpolating Dual-channel Digital-to-analog Converter
DescriptionTexas Instruments DAC5686 Interpolating Dual Channel Digital-to-Analog Converter
OverviewThe 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.
Key Features500-MSPS Maximum-Update-Rate DAC WCDMA ACPR- • 1 Carrier: 76 dB Centered at 30.72-MHz IF, 245.76 MSPS- • 1 Carrier: 73 dB Centered at 61.44-MHz IF, 245.76 MSPS- • 2 Carrier: 72 dB Centered at 30.72-MHz IF, 245.76 MSPS- • 4 Carrier: 64 dB Centered at 92.16-MHz IF, 491.52 MSPS Selectable 2×, 4×, 8×, and 16× Interpolation- • Linear Phase- • 0.05-dB Pass-Band Ripple- • 80-dB Stop-Band Attenuation- • Stop-Band Transition 0.4-0.6 f DATA 32-Bit Programmable NCO On-Chip 2×-16× PLL Clock Multiplier With Bypass Mode Differential Scalable Current Outputs: 2 mA to 20 mA On-Chip 1.2-V Reference 1.8-V Digital and 3.3-V Analog Supplies 1.8-V/3.3-V CMOS-Compatible Interface Power Dissipation: 950 mW at Full Maximum Operating Conditions Package: 100-Pin HTQFP
Typical ApplicationsCellular Base Transceiver Station Transmit Channel- • CDMA: W-CDMA, CDMA2000, IS-95- • TDMA: GSM, IS-136, EDGE/UWC-136 Baseband I and Q Transmit Input Interface: Quadrature Modulation for Interfacing With Baseband Complex Mixing ASICs Single-Sideband Up-Conversion Diversity Transmit Cable Modem Termination System
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