DAC5689 Datasheet, PDF (1/48 Pages) Texas Instruments – 16-BIT 800 MSPS 2x-8x INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC)

DAC5689
www.ti.com .......................................................................................................................................................................................... SLLS989 – SEPTEMBER 2009
16-BIT, 800 MSPS 2x–8x INTERPOLATING DUAL-CHANNEL
DIGITAL-TO-ANALOG CONVERTER (DAC)
FEATURES
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• 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
• 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)
DESCRIPTION
The DAC5689 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), IQ
compensation, and internal voltage reference.
Different modes of operation enable or bypass
various signal processing blocks. The DAC5689
offers superior linearity, noise and crosstalk
performance.
The DAC5689 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 be interpolated 2x, 4x or 8x by
on-board digital interpolating FIR filters with over 80
dB of stop-band attenuation.
The DAC5689 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 the 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 DAC5689 is pin upgradeable to the DAC5688
which includes a clock multiplying PLL. The DAC5689
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.
ORDERING INFORMATION⁽¹⁾⁽²⁾
ORDER CODE
T_A = –40°C to 85°C
DAC5689IRGCT
DAC5689IRGCR
PACKAGE QTY
TAPE AND REEL FORMAT
250
2000
PACKAGE
DRAWING/TYPE^{(3) (4)}
RGC / 64QFN
Quad FlatpackNo-Lead
(1) For correct DAC5689 operation, bits [1:0] in register CONFIG26 need to be set to "10" at device startup (see Recommended Startup
Sequence).
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(3) Thermal Pad Size: 7,4 mm × 7,4 mm
(4) MSL Peak Temperature: Level-3-260C-168 HR
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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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated