DAC5687 Datasheet, PDF (1/72 Pages) Texas Instruments – 16-BIT, 500 MSPS 2x-8x INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC)

DAC5687
www.ti.com
SLWS164B – FEBRUARY 2005 – REVISED JUNE 2005
16-BIT, 500 MSPS 2x-8x INTERPOLATING DUAL-CHANNEL
DIGITAL-TO-ANALOG CONVERTER (DAC)
FEATURES
• 500 MSPS
• Selectable 2x-8x 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 Fs/4 and Fs/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 2x,
4x, and 8x interpolation filters, a complex numerically
controlled oscillator (NCO), on-board clock multiplier,
IQ compensation and on-chip voltage reference. The
DAC5687 is pin compatible to the DAC5686, requir-
ing only changes in register settings for most appli-
cations, and offers additional features and superior
linearity, noise, crosstalk, and PLL phase noise per-
formance.
The DAC5687 has six signal processing blocks: two
interpolate by two digital filters, fine frequency mixer
with 32-bit NCO, a quadrature modulation compen-
sation 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. Com-
bining the frequency upconversion and complex out-
put produces a Hilbert Transform pair that is output
from the two DACs. An external RF quadrature
modulator then performs the final single sideband
up-conversion.
The IQ compensation feature allows optimization of
phase, gain and offset to maximize sideband rejection
and minimize LO feedthrough for an analog quadra-
ture 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⁾ (P&P) PowerPAD™
Plastic Quad FlatPack
DAC5687IPZP
(1) Thermal Pad Size: 6 mm × 6 mm.
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 © 2005, Texas Instruments Incorporated