AD9779PCB datasheet(1/34 Pages) AD

Part #	AD9779PCB

Description	Dual 16-Bit, 1.0 GSPS D/A Converter

PDF	34 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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Rev. PrD

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registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

Dual 16-Bit, 1.0 GSPS

D/A Converter

Preliminary Technical Data

AD9779

FEATURES

• 1.8/3.3 V Single Supply Operation

• Low power: 950mW (I

OUTFS

= 20 mA; fDAC = 1 GSPS, 4

×

Interpolation

• DNL = ± 1.5 LSB, INL = ± 5.0 LSB

• SFDR =82 dBc to f

OUT

= 100 MHz

• ACLR = 87 dBc @ 80 MHz IF

• CMOS data interface with Autotracking Input Timing

• Analog Output: Adjustable 10-30mA (RL=25 Ω to 50 Ω)

• 100-lead Exposed Paddle TQFP Package

• Multiple Chip Synchronization Interface

• 84dB Digital Interpolation Filter Stopband Attenuation

• Digital Inverse Sinc Filter

APPLICATIONS

• Wireless Infrastructure

Direct Conversion

Transmit Diversity

• Wideband Communications Systems:

Point-to-Point Wireless, LMDS

PRODUCT DESCRIPTION

The AD9779 is a dual 16-bit high performance, high frequency

DAC that provides a sample rate of 1 GSPS, permitting multi

carrier generation up to its Nyquist frequency. It includes features

optimized for direct conversion transmit applications, including

complex digital modulation and gain and offset compensation. The

DAC outputs are optimized to interface seamlessly with analog

quadrature modulators such as the AD8349. A serial peripheral

interface (SPI) provides for programming many internal

parameters and also enables read-back of status registers. The

output current can be programmed over a range of 10mA to 30mA.

The AD9779 is manufactured on an advanced 0.18µm CMOS

process and operates from 1.8V and 3.3V supplies for a total power

consumption of 950mW. It is supplied in a 100-lead QFP package.

PRODUCT HIGHLIGHTS

Ultra-low noise and Intermodulation Distortion (IMD) enable

high quality synthesis of wideband signals from baseband to high

intermediate frequencies.

Single-ended CMOS interface supports a maximum input rate of

300 MSPS with 1x interpolation.

Manufactured on a CMOS process, the AD9779 uses a proprietary

switching technique that enhances dynamic performance.

The current outputs of the AD9779 can be easily configured for

various single-ended or differential circuit topologies.

FUNCTIONAL BLOCK DIAGRAM

Complex

Modulator

Clock Generation/Distribution

2X

n * Fdac/8

n = 1, 2, 3… 7

P2D[15:0]

IOUT2_P

IOUT2_N

CLK+

CLK-

DATACLK_OUT

2X

Sinc-1

16-Bit

IDAC

16-Bit

QDAC

Digital Controller

Clock

Multiplier

2X/4X/8X

Gain

Offset

Reference

& Bias

10

Power-On

Reset

Serial

Peripheral

Interface

Q Latch

I Latch

Delay Line

Data

Assembler

IOUT1_P

IOUT1_N

VREF

RSET

AUX1_P

AUX1_N

AUX2_P

AUX2_N

P1D[15:0]

SYNC_I

SYNC_O

Figure 1 Functional Block Diagram

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