8-Bit, 125 MSPS, Dual TxDAC+
Digital-to-Analog Converter
AD9709
FEATURES FUNCTIONAL BLOCK DIAGRAM
DVDD1/ DCOM1/
8-bit dual transmit digital-to-analog converter (DAC)
DVDD2 DCOM2 AVDD ACOM CLK1
125 MSPS update rate
I
OUTA1
1 1
Excellent SFDR to Nyquist @ 5 MHz output: 66 dBc
PORT1
LATCH DAC
I
OUTB1
Excellent gain and offset matching: 0.1%
REFIO
Fully independent or single-resistor gain control
FSADJ1
REFERENCE
WRT1/IQWRT FSADJ2
Dual port or interleaved data DIGITAL
AD9709
GAINCTRL
INTERFACE
WRT2/IQSEL
On-chip 1.2 V reference
BIAS
SLEEP
GENERATOR
Single 5 V or 3.3 V supply operation
I
Power dissipation: 380 mW @ 5 V
2 2 OUTA2
PORT2
LATCH DAC
I
Power-down mode: 50 mW @ 5 V OUTB2
48-lead LQFP
MODE CLK2/IQ RESET
Figure 1.
APPLICATIONS
Communications
Base stations
Digital synthesis
Quadrature modulation
3D ultrasound
glitch energy and to maximize dynamic accuracy. Each DAC
GENERAL DESCRIPTION
provides differential current output, thus supporting single-
1
The AD9709 is a dual-port, high speed, 2-channel, 8-bit CMOS
ended or differential applications. Both DACs can be
DAC. It integrates two high quality 8-bit TxDAC+ cores, a voltage
simultaneously updated and provide a nominal full-scale
reference, and digital interface circuitry into a small 48-lead LQFP
current of 20 mA. The full-scale currents between each DAC
package. The AD9709 offers exceptional ac and dc performance
are matched to within 0.1%.
while supporting update rates of up to 125 MSPS.
The AD9709 is manufactured on an advanced low-cost CMOS
The AD9709 has been optimized for processing I and Q data in
process. It operates from a single supply of 3.3 V or 5 V and
communications applications. The digital interface consists of two
consumes 380 mW of power.
double-buffered latches as well as control logic. Separate write
inputs allow data to be written to the two DAC ports independent PRODUCT HIGHLIGHTS
of one another. Separate clocks control the update rate of the DACs.
1. The AD9709 is a member of a pin-compatible family of
A mode control pin allows the AD9709 to interface to two separate dual TxDACs providing 8-, 10-, 12-, and 14-bit resolution.
data ports, or to a single interleaved high speed data port. In inter- 2. Dual 8-Bit, 125 MSPS DACs. A pair of high performance
leaving mode, the input data stream is demuxed into its original DACs optimized for low distortion performance provide
I and Q data and then latched. The I and Q data is then converted for flexible transmission of I and Q information.
by the two DACs and updated at half the input data rate. 3. Matching. Gain matching is typically 0.1% of full scale, and
offset error is better than 0.02%.
The GAINCTRL pin allows two modes for setting the full-scale
4. Low Power. Complete CMOS dual DAC function operates
current (IOUTFS) of the two DACs. IOUTFS for each DAC can be set
at 380 mW from a 3.3 V or 5 V single supply. The DAC
independently using two external resistors, or IOUTFS for both
full-scale current can be reduced for lower power operation,
DACs can be set by using a single external resistor. See the Gain
and a sleep mode is provided for low power idle periods.
Control Mode section for important date code information on
5. On-Chip Voltage Reference. The AD9709 includes a 1.20 V
this feature.
temperature-compensated band gap voltage reference.
The DACs utilize a segmented current source architecture
6. Dual 8-Bit Inputs. The AD9709 features a flexible dual-
combined with a proprietary switching technique to reduce
port interface, allowing dual or interleaved input data.
1
Patent pending.
Rev. B
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00606-001AD9709* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS REFERENCE MATERIALS
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EVALUATION KITS
Solutions Bulletins & Brochures
AD9709 Evaluation Board
Digital to Analog Converters ICs Solutions Bulletin
DOCUMENTATION
DESIGN RESOURCES
Application Notes
AD9709 Material Declaration
AN-237: Choosing DACs for Direct Digital Synthesis
PCN-PDN Information
AN-320A: CMOS Multiplying DACs and Op Amps Combine
Quality And Reliability
to Build Programmable Gain Amplifier, Part 1
Symbols and Footprints
AN-555: Using the AD9709, AD9763, AD9765, AD9767
Dual DAC Evaluation Board
DISCUSSIONS
AN-595: Understanding Pin Compatibility in the TxDAC
View all AD9709 EngineerZone Discussions.
Line of High Speed D/A Converters
AN-912: Driving a Center-Tapped Transformer with a
SAMPLE AND BUY
Balanced Current-Output DAC
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Data Sheet
AD9709: 8-Bit, 125 MSPS Dual TxDAC+ D/A Converter
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TOOLS AND SIMULATIONS
AD9709 IBIS Models
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