AD9643-250EBZ datasheet(1/36 Pages) AD

Part #	AD9643-250EBZ

Description	14-Bit, 170 MSPS/210 MSPS/250 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC)

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14-Bit, 170 MSPS/210 MSPS/250 MSPS, 1.8 V

Dual Analog-to-Digital Converter (

ADC)

AD9643

Rev. A

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

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

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 = 70.6 dBFS at 185 MHz AIN and 250 MSPS

SFDR = 85 dBc at 185 MHz AIN and 250 MSPS

−151.6 dBFS/Hz input noise at 185 MHz, −1 dBFS AIN and

250 MSPS

Total power consumption: 785 mW at 250 MSPS

1.8 V supply voltages

LVDS (ANSI-644 levels) outputs

Integer 1-to-8 input clock divider (625 MHz maximum input)

Sample rates of up to 250 MSPS

IF sampling frequencies of up to 400 MHz

Internal ADC voltage reference

Flexible analog input range

1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal)

ADC clock duty cycle stabilizer

95 dB channel isolation/crosstalk

Serial port control

Energy saving power-down modes

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

APPLICATIONS

Communications

Diversity radio systems

Multimode digital receivers (3G)

TD-SCDMA, WiMax, WCDMA, CDMA2000, GSM, EDGE, LTE

I/Q demodulation systems

Smart antenna systems

General-purpose software radios

Ultrasound equipment

Broadband data applications

FUNCTIONAL BLOCK DIAGRAM

14

REFERENCE

SERIAL PORT

SCLK

SDIO

CSB

CLK+

CLK–

SYNC

1TO 8

CLOCK

DIVIDER

AD9643

VIN+A

D0±

D13±

DCO±

OR±

PDWN

OEB

VIN–A

VIN+B

VCM

VIN–B

NOTES

1. THE D0± TO D13± PINS REPRESENT BOTH THE CHANNEL A

AND CHANNEL B LVDS OUTPUT DATA.

AVDD

AGND

DRVDD

.

PARALLEL

DDR LVDS

AND

DRIVERS

PIPELINE

14-BIT

ADC

PIPELINE

14-BIT

ADC

Figure 1.

GENERAL DESCRIPTION

The AD9643 is a dual, 14-bit analog-to-digital converter (ADC)

with sampling speeds of up to 250 MSPS. The AD9643 is designed

to support communications applications, where low cost, small

size, wide bandwidth, and versatility are desired.

The dual ADC cores feature a multistage, differential pipelined

architecture with integrated output error correction logic. Each

ADC features wide bandwidth inputs supporting a variety of

user-selectable input ranges. An integrated voltage reference

eases design considerations. A duty cycle stabilizer is provided

to compensate for variations in the ADC clock duty cycle,

allowing the converters to maintain excellent performance.

The ADC output data is routed directly to the two external

14-bit LVDS output ports and formatted as either interleaved or

channel multiplexed.

Flexible power-down options allow significant power savings,

when desired.

Programming for setup and control are accomplished using a

3-wire SPI-compatible serial interface.

The AD9643 is available in a 64-lead LFCSP and is specified over

the industrial temperature range of −40°C to +85°C. This

product is protected by a U.S. patent.

PRODUCT HIGHLIGHTS

1. Integrated dual, 14-bit, 170 MSPS/210 MSPS/250 MSPS ADCs.

2. Operation from a single 1.8 V supply and a separate digital

output driver supply accommodating LVDS outputs.

3. Proprietary differential input maintains excellent SNR

performance for input frequencies of up to 400 MHz.

4. SYNC input allows synchronization of multiple devices.

5. 3-pin, 1.8 V SPI port for register programming and register

readback.

6. Pin compatibility with the AD9613, allowing a simple

migration down from 14 bits to 12 bits. This part is also pin

compatible with the AD6649 and the AD6643.

Similar Part No. - AD9643-250EBZ

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD9643-250EBZ	1Mb / 36P	14-Bit, 170 MSPS/210 MSPS/250 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC)

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