DAC5687_15 Datasheet, PDF (1/80 Pages) Texas Instruments – 16-BIT, 500 MSPS 2´–8´ INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC)

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