AD9721 Analog Devices, Inc., AD9721 Datasheet

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AD9721

Manufacturer Part Number
AD9721
Description
Ad9731 10-bit, 170 Msps
Manufacturer
Analog Devices, Inc.
Datasheet

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a
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
GENERAL DESCRIPTION
The AD9731 is a 10-bit, 170 MSPS, bipolar D/A converter that is
optimized to provide high dynamic performance, yet offer lower
power dissipation and more economical pricing than afforded by
previous bipolar high performance DAC solutions. The AD9731
was designed primarily for demanding communications systems
applications where wideband spurious-free dynamic range (SFDR)
requirements are strenuous and could previously only be met by
using a high performance DAC such as the industry-standard
AD9721. The proliferation of digital communications into base
station and high volume subscriber-end markets has created a
demand for excellent DAC performance delivered at reduced
levels of power dissipation and cost. The AD9731 is the answer
to that demand.
FEATURES
170 MSPS Update Rate
TTL/High Speed CMOS-Compatible Inputs
Wideband SFDR: 66 dB @ 2 MHz/50 dB @ 65 MHz
Pin-Compatible, Lower Cost Replacement for
Low Power: 439 mW @ 170 MSPS
Fast Settling: 3.8 ns to 1/2 LSB
Internal Reference
Two Package Styles: 28-Lead SOIC and SSOP
APPLICATIONS
Digital Communications
Direct Digital Synthesis
Waveform Reconstruction
High Speed Imaging
5 MHz to 65 MHz HFC Upstream Path
Industry Standard AD9721 DAC
Optimized for direct digital synthesis (DDS) waveform recon-
struction, the AD9731 provides 50 dB of wideband harmonic
suppression over a dc-to-65 MHz analog output bandwidth.
This signal bandwidth addresses the transmit spectrum in many
of the emerging digital communications applications where
signal purity is critical. Narrowband, the AD9731 provides an
SFDR of greater than 79 dB. This excellent wideband and
narrowband ac performance, coupled with a lower pricing structure,
make the AD9731 the optimum high performance DAC value.
The AD9731 is packaged in 28-lead SOIC (same footprint
as the industry-standard AD9721) and super space-saving
28-lead SSOP; both are specified to operate over the extended
industrial temperature range of –40∞C to +85∞C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
CLOCK
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
R
SET
DRIVE
LOGIC
TTL
INTERNAL VOLTAGE
FUNCTIONAL BLOCK DIAGRAM
REFERENCE
REF OUT
DECODERS
DRIVERS
© 2003 Analog Devices, Inc. All rights reserved.
AND
CONTROL
AMP IN
10-Bit, 170 MSPS
REGISTER
DIGITAL
D/A Converter
–V
CONTROL
AMP
S
DIGITAL
+V
NETWORK
AD9731
SWITCH
S
www.analog.com
ANALOG
–V
S
IOUT
IOUT
REF IN
AMP OUT
ANALOG
RETURN

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AD9721 Summary of contents

Page 1

... DAC such as the industry-standard AD9721. The proliferation of digital communications into base station and high volume subscriber-end markets has created a demand for excellent DAC performance delivered at reduced levels of power dissipation and cost ...

Page 2

AD9731–SPECIFICATIONS Parameter RESOLUTION MAX CONVERSION RATE DC ACCURACY Differential Nonlinearity Integral Nonlinearity INITIAL OFFSET ERROR Zero-Scale Offset Error 1 Full-Scale Gain Error Offset Drift Coefficient REFERENCE/CONTROL AMP 2 Internal Reference Voltage Internal Reference Voltage Drift 3 Internal Reference Output Current ...

Page 3

SPECIFICATIONS Parameter SFDR PERFORMANCE (Narrowband) 2 MHz; 2 MHz Span 25 MHz, 2 MHz Span 10 MHz, 5 MHz Span (Clock = 170 MHz) INTERMODULATION DISTORTION F1 = 800 kHz 900 kHz 15 POWER SUPPLY Digital –V Supply ...

Page 4

AD9731 ABSOLUTE MAXIMUM RATINGS* Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . – ...

Page 5

Pin No. Mnemonic 1 D9(MSB) 2–9 D8–D1 10 D0(LSB) 11 CLOCK 12 DIGITAL +V S 15, 18, 28 GND 16 DIGITAL – SET 19 ANALOG RETURN 20 I OUT 21 I OUTB 22 ANALOG ...

Page 6

AD9731 –Typical Performance Characteristics – MHz OUT TPC 1. Narrowband SFDR (Clock = 170 MHz) vs. f Frequency OUT ...

Page 7

I – mA OUT TPC 7. SFDR vs. I (Clock =125 MHz/f OUT 0.4 0.3 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 TPC 8. Typical Differential Nonlinearity Performance (DNL) ...

Page 8

AD9731 –10 ENCODE = 125MHz f –20 = 40MHz OUT SPAN = 62.5MHz –30 –40 –50 –60 –70 –80 –90 –100 0Hz 6.25MHz/DIV START TPC 13. Wideband SFDR 40 MHz f 125 MHz Clock 0 ENCODE = 170MHz f –10 ...

Page 9

THEORY AND APPLICATIONS The AD9731 high speed digital-to-analog converter utilizes most significant bit decoding and segmentation techniques to reduce glitch impulse and deliver high dynamic performance on lower power consumption than previous bipolar DAC technologies. The design is based on ...

Page 10

AD9731 The REFERENCE IN pin can also be driven directly for wider bandwidth multiplying operation. The analog signal for this mode of operation must have a signal swing in the range of –3 –4.25 V. This can be ...

Page 11

REV. B Figure 6. PCB Evaluation Board Schematic –11– AD9731 ...

Page 12

AD9731 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 2.00 MAX 0.05 MIN Revision History Location 5/03–Data Sheet ...

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