SLWS164E â FEBRUARY 2005 â REVISED SEPTEMBER 2006
16-BIT, 500 MSPS 2Ãâ8Ã INTERPOLATING DUAL-CHANNEL
DIGITAL-TO-ANALOG CONVERTER (DAC)
â¢2345 500 MSPS
â¢ Selectable 2Ãâ8Ã Interpolation
â¢ On-Chip PLL/VCO Clock Multiplier
â¢ Full IQ Compensation Including Offset, Gain,
â¢ Flexible Input Options:
â FIFO With Latch on External or Internal
â Even/Odd Multiplexed Input
â Single Port Demultiplexed Input
â¢ Complex Mixer With 32-Bit NCO
â¢ Fixed Frequency Mixer With fS/4 and fS/2
â¢ 1.8-V or 3.3-V I/O Voltage
â¢ On-Chip 1.2-V Reference
â¢ Differential Scalable Output: 2 mA to 20 mA
â¢ Pin Compatible to DAC5686
â¢ High Performance
â 81-dBc ACLR WCDMA TM1 at 30.72 MHz
â 72-dBc ACLR WCDMA TM1 at 153.6 MHz
â¢ Package: 100-Pin HTQFP
â¢ Cellular Base Transceiver Station Transmit
â CDMA: W-CDMA, CDMA2000, TD-SCDMA
â TDMA: GSM, IS-136, EDGE/UWC-136
â OFDM: 802.16
â¢ Cable Modem Termination System
The DAC5687 is a dual-channel 16-bit high-speed
digital-to-analog converter (DAC) with integrated 2Ã,
4Ã, and 8Ã 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
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 fS/2 or fS/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
The IQ compensation feature allows optimization of
phase, gain, and offset to maximize sideband
rejection and minimize LO feedthrough for an analog
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.
â40Â°C to 85Â°C
100 HTQFP(1) (PZP) PowerPADâ¢
package, plastic quad flatpack
(1) Thermal pad size: 6 mm Ã 6 mm.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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 Â© 2005â2006, Texas Instruments Incorporated