AD9268-80EBZ datasheet(1/45 Pages) AD

Part #	AD9268-80EBZ

Description	1.8 V Dual Analog-to-Digital Converter (ADC)

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16-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Dual

Analog-to-Digital Converter (ADC)

AD9268

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

SNR = 78.2 dBFS @ 70 MHz and 125 MSPS

SFDR = 88 dBc @ 70 MHz and 125 MSPS

Low power: 750 mW @ 125 MSPS

1.8 V analog supply operation

1.8 V CMOS or LVDS output supply

Integer 1-to-8 input clock divider

IF sampling frequencies to 300 MHz

−153.6 dBm/Hz small-signal input noise with 200 Ω input

impedance @ 70 MHz and 125 MSPS

Optional on-chip dither

Programmable internal ADC voltage reference

Integrated ADC sample-and-hold inputs

Flexible analog input range: 1 V p-p to 2 V p-p

Differential analog inputs with 650 MHz bandwidth

ADC clock duty cycle stabilizer

95 dB channel isolation/crosstalk

Serial port control

User-configurable, built-in self-test (BIST) capability

Energy-saving power-down modes

APPLICATIONS

Communications

Diversity radio systems

Multimode digital receivers (3G)

GSM, EDGE, W-CDMA, LTE,

CDMA2000, WiMAX, TD-SCDMA

I/Q demodulation systems

Smart antenna systems

General-purpose software radios

Broadband data applications

Ultrasound equipment

FUNCTIONAL BLOCK DIAGRAM

CMOS/LVDS

OUTPUT BUFFER

CMOS/LVDS

OUTPUT BUFFER

ADC

DRVDD

CSB

AVDD

SPI

SDIO/

DCS

SCLK/

DFS

PROGRAMMING DATA

DUTY CYCLE

STABILIZER

DIVIDE 1

TO 8

DCO

GENERATION

REF

SELECT

MULTICHIP

SYNC

AGND

NOTES

1. PIN NAMES ARE FOR THE CMOS PIN CONFIGURATION ONLY;

SEE FIGURE 7 FOR LVDS PIN NAMES.

PDWN

OEB

DCOB

DCOA

D15A (MSB)

TO

D0A (LSB)

D15B (MSB)

TO

D0B (LSB)

ORA

CLK–

CLK+

ORB

VIN+A

VCM

RBIAS

VIN–B

VIN+B

VIN–A

VREF

SENSE

AD9268

ADC

16

Figure 1.

PRODUCT HIGHLIGHTS

1.

On-chip dither option for improved SFDR performance

with low power analog input.

2.

Proprietary differential input that maintains excellent SNR

performance for input frequencies up to 300 MHz.

3.

Operation from a single 1.8 V supply and a separate digital

output driver supply accommodating 1.8 V CMOS or

LVDS outputs.

4.

Standard serial port interface (SPI) that supports various

product features and functions, such as data formatting

(offset binary, twos complement, or gray coding), enabling

the clock DCS, power-down, test modes, and voltage

reference mode.

5.

Pin compatibility with the AD9258, allowing a simple

migration from 16 bits to 14 bits. The AD9268 is also pin

compatible with the AD9251, AD9231, and AD9204 family

of products for lower sample rate, low power applications.

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