16-bit, 800 MSPS 2x-8x Interpolating Dual-Channel Digital-to-Analog Converter with integrated PLL - DAC5688

DAC5688 (ACTIVE)

16-bit, 800 MSPS 2x-8x Interpolating Dual-Channel Digital-to-Analog Converter with integrated PLL

Description

The DAC5688 is a dual-channel 16-bit 800 MSPS digital-to-analog converter (DAC) with dual CMOS digital data bus, integrated 2x-8x interpolation filters, a fine frequency mixer with 32-bit complex numerically controlled oscillator (NCO), on-board clock multiplier, IQ compensation, and internal voltage reference. Different modes of operation enable or bypass various signal processing blocks. The DAC5688 offers superior linearity, noise, crosstalk and PLL phase noise performance.

The DAC5688 dual CMOS data bus provides 250 MSPS input data transfer per DAC channel. Several input data options are available: dual-bus data, single-bus interleaved data, even and odd multiplexing at half-rate, and an input FIFO with either external or internal clock to ease interface timing. Input data can interpolated 2x, 4x or 8x by on-board digital interpolating FIR filters with over 80 dB of stop-band attenuation.

The DAC5688 allows both complex or real output. An optional 32-bit NCO/mixer in complex mode provides frequency upconversion and the dual DAC output produces a complex Hilbert Transform pair. A digital Inverse SINC filter compensates for natural DAC sin(x)/x frequency roll-off. The digital Quadrature Modulator Correction (QMC) feature allows IQ compensation of phase, gain and offset to maximize sideband rejection and minimize LO feed-through of an external quadrature modulator performing the final single sideband RF up-conversion.

The DAC5688 is pin compatible with the DAC5689 which does not include a clock-multiplying PLL. The DAC5688 is characterized for operation over the industrial temperature range of –40°C to 85°C and is available in a 64-pin 9x9mm QFN package.

Features

  • Dual, 16-Bit, 800 MSPS DACs
  • Dual, 16-Bit, 250 MSPS CMOS Input Data
    • 16 Sample Input FIFO
    • Flexible input data bus options
  • High Performance
    • 81 dBc ACLR WCDMA TM1 at 70 MHz
  • 2x-32x Clock Multiplying PLL/VCO
  • Selectable 2x–8x Interpolation Filters
    • Stop-band Attenuation > 80 dB
  • Complex Mixer with 32-Bit NCO
  • Digital Quadrature Modulator Correction
    • Gain, Phase and Offset Correction
  • Digital Inverse SINC Filter
  • 3- or 4-Wire Serial Control Interface
  • On Chip 1.2-V Reference
  • Differential Scalable Output: 2 to 20 mA
  • Package: 64-pin 9×9mm QFN
  • APPLICATIONS
    • Cellular Base Stations
    • Broadband Wireless Access (BWA)
    • WiMAX 802.16
    • Fixed Wireless Backhaul
    • Cable Modem Termination System (CMTS)

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Parametrics Compare all products in High Speed DAC (>10MSPS)

 
Resolution (Bits)
Sample / Update Rate (MSPS)
Architecture
DAC: Channels
Interface
SFDR (dB)
IMD3 (dBc)
Interpolation
Operating Temperature Range (C)
Rating
Pin/Package
Approx. Price (US$)
DAC5688 DAC5687 DAC5689
16     16     16    
800     500     800    
Current Sink     Current Sink     Current Sink    
2     2     2    
Parallel CMOS     Parallel CMOS     Parallel CMOS    
80     80     80    
85     79     85    
2x
4x
8x    
2x
4x
8x    
2x
4x
8x    
-40 to 85     -40 to 85     -40 to 85    
Catalog     Catalog     Catalog    
64VQFN     100HTQFP     64VQFN    
29.95 | 1ku     27.23 | 1ku     28.95 | 1ku    

Companion parts

Part # Name Product Family Comments
CDCE62005   5/10 Outputs Clock Generator/Jitter Cleaner with Integrated Dual VCO   Clock Generators - Low Jitter <1psec RMS    Provides low-jitter clock input to DAC5688 with ability to synch multiple DACs  
CDCE72010   10 Outputs Low Jitter Clock Synchronizer and Jitter Cleaner   Clock Jitter Cleaners - Single-Loop PLL    Provides low-jitter clock distribution for DAC5688 with the ability to synch multiple DACs  
TRF370417   50MHz to 6.0 GHz Quadrature Modulator, 1.7V common-mode voltage   Broadband RF/IF - IQ MODULATOR    50 MHz to 6 GHz High Linearity, Low Noise, Quadrature Modulator  
LMK04806   Low Noise Clock Jitter Cleaner With Dual Cascaded PLLs and Integrated 2.5 GHz VCO   Clock Jitter Cleaners - Dual / Cascaded PLL    Recommended clocking solution, providing low jitter clock outputs to maximize converter performance.  
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