AD9709ASTZ Analog Devices Inc, AD9709ASTZ Datasheet
AD9709ASTZ
Specifications of AD9709ASTZ
Available stocks
Related parts for AD9709ASTZ
AD9709ASTZ Summary of contents
Page 1
FEATURES 8-bit dual transmit digital-to-analog converter (DAC) 125 MSPS update rate Excellent SFDR to Nyquist @ 5 MHz output: 66 dBc Excellent gain and offset matching: 0.1% Fully independent or single-resistor gain control Dual port or interleaved data On-chip 1.2 ...
Page 2
AD9709 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 DC Specifications ......................................................................... 3 Dynamic Specifications ............................................................... 4 Digital Specifications ...
Page 3
SPECIFICATIONS DC SPECIFICATIONS AVDD = 3 DVDD1 = DVDD2 = 3 MIN MAX Table 1. Parameter RESOLUTION 1 DC ACCURACY Integral Linearity Error (INL) Differential Nonlinearity (DNL) ...
Page 4
AD9709 DYNAMIC SPECIFICATIONS AVDD = 3 DVDD1 = DVDD2 = 3 MIN MAX doubly terminated, unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE Maximum Output Update Rate ...
Page 5
DIGITAL SPECIFICATIONS AVDD = 3 DVDD1 = DVDD2 = 3 MIN MAX Table 3. Parameter DIGITAL INPUTS Logic 1 Voltage @ DVDD1 = DVDD2 = 5 V ...
Page 6
AD9709 ABSOLUTE MAXIMUM RATINGS Table 4. With Parameter Respect To AVDD ACOM DVDD1, DVDD2 DCOM1/DCOM2 ACOM DCOM1/DCOM2 AVDD DVDD1/DVDD2 MODE, CLK1/IQCLK, DCOM1/DCOM2 CLK2/IQRESET, WRT1/IQWRT, WRT2/IQSEL Digital Inputs DCOM1/DCOM2 ACOM OUTA1 OUTA2 I /I OUTB1 OUTB2 REFIO, FSADJ1, ...
Page 7
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS DB7P1 (MSB CONNECT Table 6. Pin Function Descriptions Pin No. Mnemonic DB7P1 to DB0P1 15, 21 DCOM1, DCOM2 16, 22 DVDD1, DVDD2 ...
Page 8
AD9709 TYPICAL PERFORMANCE CHARACTERISTICS AVDD = 3 DVDD = 3 unless otherwise noted 5MSPS CLK 65MSPS 55 CLK f = 125MSPS CLK 50 45 0.1 1 ...
Page 9
A (dBFS) OUT Figure 10. Single-Tone SFDR vs OUT OUT 75 70 5MSPS/1.0MHz 65 ...
Page 10
AD9709 10MHz OUT 25MHz OUT 40MHz OUT 60MHz OUT 50 45 –50 –30 – TEMPERATURE (°C) Figure 16. SFDR vs. Temperature @ f CLK 0.05 ...
Page 11
TERMINOLOGY Linearity Error (Integral Nonlinearity or INL) Linearity error is defined as the maximum deviation of the actual analog output from the ideal output, determined by a straight line drawn from zero to full-scale. Differential Nonlinearity (DNL) DNL is the ...
Page 12
AD9709 THEORY OF OPERATION FSADJ1 R 1 SET REFIO 2kΩ 0.1µF FSADJ2 R 2 SET 2kΩ 1.2V REF WRT1/ GAINCTRL IQWRT DVDD1/DVDD2 50Ω DCOM1/DCOM2 RETIMED CLOCK OUTPUT* LECROY 9210 PULSE GENERATOR Figure 21. Basic AC Characterization Test Setup for AD9709, ...
Page 13
The full-scale output current of each DAC is regulated by separate reference control amplifiers and can be set from via an external network connected to the full-scale adjust (FSADJ) pin. The external network in combination ...
Page 14
AD9709 DAC TRANSFER FUNCTION Both DACs in the AD9709 provide complementary current out- puts, I and provides a near full-scale current OUTA OUTB OUTA output when all bits are high (that is, DAC CODE = ...
Page 15
DIGITAL INPUTS The digital inputs of the AD9709 consist of two independent channels. For the dual port mode, each DAC has its own dedicated 8-bit data port: WRT line and CLK line. In the interleaved timing mode, the function of ...
Page 16
AD9709 Timing specifications for interleaved mode are shown in Figure 28 and Figure 30. The digital inputs are CMOS compatible with logic thresholds set to approximately half the digital positive supply THRESHOLD (DVDDx DVDDx/2 (±20%) ...
Page 17
Digital signal paths should be kept short, and run lengths should be matched to avoid propagation delay mismatch. The insertion of a low value (that is, 20 Ω to 100 Ω) resistor network between the AD9709 digital inputs and driver ...
Page 18
AD9709 SLEEP MODE OPERATION The AD9709 has a power-down function that turns off the output current and reduces the supply current to less than 8.5 mA over the specified supply range of 3 and temperature range. ...
Page 19
APPLYING THE AD9709 OUTPUT CONFIGURATIONS The following sections illustrate some typical output configura- tions for the AD9709. Unless otherwise noted assumed that I is set to a nominal 20 mA. For applications requiring the OUTFS optimum dynamic performance, ...
Page 20
AD9709 SINGLE-ENDED, UNBUFFERED VOLTAGE OUTPUT Figure 39 shows the AD9709 configured to provide a unipolar output range of approximately 0.5 V for a doubly terminated 50 Ω cable, because the nominal full-scale current, I flows through the ...
Page 21
An example serves to illustrate the effect of supply noise on the analog supply. Suppose a switching regulator with a switching frequency of 250 kHz produces noise and, for simplicity’s sake, all of this noise is concentrated ...
Page 22
AD9709 APPLICATIONS INFORMATION QUADRATURE AMPLITUDE MODULATION (QAM) USING THE AD9709 QAM is one of the most widely used digital modulation schemes in digital communications systems. This modulation technique can be found in FDM as well as spread spectrum (that is, ...
Page 23
I and Q digital data can be fed into the AD9709 in two ways. In dual port mode, the digital I information drives one input port, and the digital Q information drives the other input port interpolation filter ...
Page 24
AD9709 EVALUATION BOARD GENERAL DESCRIPTION The AD9709- evaluation board for the AD9709 8-bit dual DAC. Careful attention to layout and circuit design, combined with a prototyping area, allow the user to easily and effectively evaluate the AD9709 in ...
Page 25
CC0805 CC0805 Figure 47. Power Decoupling and Clocks on AD9709 Evaluation Board (2) Rev Page RC0603 RC0805 RC0805 RC0805 RC0805 RC0805 AD9709 00606-147 ...
Page 26
AD9709 L6 O2N LC0805 CC0805 C24 L5 DNP O2P LC0805 AVDD2 C20 CC0603 10UF BCASE C27 10V 100PF 2 L4 O1N LC0805 DNP CC0805 O1P LC0805 DNP R23 51 C31 RC0603 D N ...
Page 27
RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RIBBON RA Figure 49. Digital Input Signaling (1) Rev Page AD9709 00606-149 ...
Page 28
AD9709 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RC0603 RIBBON RA Figure 50. Digital Input Signaling (2) Rev Page 00606-150 ...
Page 29
CC0805 CC0805 RC07CUP RC0805 RC0805 Figure 51. Device Under Test/Analog Output Signal Conditioning Rev Page RC07CUP RC0805 RC0805 AD9709 00606-151 ...
Page 30
AD9709 EVALUATION BOARD LAYOUT Figure 52. Assembly, Top Side Rev Page ...
Page 31
Figure 53. Assembly, Bottom Side Rev Page AD9709 ...
Page 32
... ROTATED 90° CCW ORDERING GUIDE Model Temperature Range AD9709ASTZ 1 –40°C to +85°C 1 AD9709ASTZRL –40°C to +85°C 1 AD9709-EBZ RoHS Compliant Part. ©2000–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 0.75 1 ...