AD9789BBCZ datasheet(1/76 Pages) AD

номер детали	AD9789BBCZ

подробное описание детали	14-Bit, 2400 MSPS RF DAC with 4-Channel Signal Processing

PDF	76 Pages

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производитель	AD [Analog Devices]

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14-Bit, 2400 MSPS RF DAC

with 4-Channel Signal Processing

AD9789

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

FEATURES

DOCSIS 3.0 performance: 4 QAM carriers

ACLR over full band (47 MHz to 1 GHz)

−75 dBc @ fOUT = 200 MHz

−72 dBc @ fOUT = 800 MHz (noise)

−67 dBc @ fOUT = 800 MHz (harmonics)

Unequalized MER = 42 dB

On chip and bypassable

4 QAM encoders with SRRC filters, 16× to 512× interpolation,

rate converters, and modulators

Flexible data interface: 4, 8, 16, or 32 bits wide with parity

Power: 1.6 W (IFS = 20 mA, fDAC = 2.4 GHz, LVDS interface)

Direct to RF synthesis support with fS mix mode

Built-in self-test (BIST) support

Input connectivity check

Internal random number generator

APPLICATIONS

Broadband communications systems

CMTS/DVB

Cellular infrastructure

Point-to-point wireless

GENERAL DESCRIPTION

The AD9789 is a flexible QAM encoder/interpolator/upconverter

combined with a high performance, 2400 MSPS, 14-bit RF digital-

to-analog converter (DAC). The flexible digital interface can

accept up to four channels of complex data. The QAM encoder

supports constellation sizes of 16, 32, 64, 128, and 256 with

SRRC filter coefficients for all standards.

The on-chip rate converter supports a wide range of baud rates

with a fixed DAC clock. The digital upconverter can place the

channels from 0 to 0.5 × fDAC. This permits four contiguous

channels to be synthesized and placed anywhere from dc to fDAC/2.

The AD9789 includes a serial peripheral interface (SPI) for

device configuration and status register readback. The flexible

digital interface can be configured for data bus widths of 4, 8,

16, and 32 bits. It can accept real or complex data.

The AD9789 operates from 1.5 V, 1.8 V, and 3.3 V supplies for

a total power consumption of 1.6 W. It is supplied in a 164-ball

chip scale package ball grid array for lower thermal impedance

and reduced package parasitics. No special power sequencing

is required. The clock receiver powers up muted to prevent

start-up noise.

PRODUCT HIGHLIGHTS

1.

Highly integrated and configurable QAM mappers, inter-

polators, and upconverters for direct synthesis of one to

four DOCSIS- or DVB-C-compatible channels in a block.

2.

Low noise and intermodulation distortion (IMD) perfor-

mance enable high quality synthesis of signals up to 1 GHz.

3.

Flexible data interface supports LVDS for improved SFDR

or CMOS input data for less demanding applications.

4.

Interface is configurable from 4-bit nibbles to 32-bit words

and can run at up to 150 MHz CMOS or 150 MHz LVDS

double data rate (DDR).

5.

Manufactured on a CMOS process, the AD9789 uses a

proprietary switching technique that enhances dynamic

performance.

FUNCTIONAL BLOCK DIAGRAM

DATA

150MHz

LVDS/CMOS

QAM/

FILTER/

NCO

QAM/

FILTER/

NCO

QAM/

FILTER/

NCO

QAM/

FILTER/

NCO

32 INPUT

PINS

AND

2PARITY

PINS

DCO

FS

16×

INTERPOLATOR

AND BPF

+ SCALARS

14-BIT

2.4GSPS

DAC

DATA

CMOS

0TO 15

LVDS

RISE

CMOS

16 TO 31

LVDS

FALL

SPI

IRQ

RS

RETIMER

DATA FORMATTER/

ASSEMBLER

Figure 1.

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