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AD9480: Description8-Bit, 250 MSPS 3.3 V A/D Converter; File Size901KB，28 Pages; ManufacturerADI; Websitehttps://www.analog.com

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8-Bit, 250 MSPS 3.3 V A/D Converter

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8-Bit, 250 MSPS

3.3 V A/D Converter

AD9480

FEATURES

DNL =

0.25 LSB

INL =

0.5 LSB

Single 3.3 V supply operation (3.0 to 3.6 V)

Power dissipation of 590 mW at 250 MSPS

1 V p-p analog input range

Internal 1.0 V reference

Single-ended or differential analog inputs

LVDS outputs (ANSI 644 levels)

Power-down mode

Clock duty cycle stabilizer

FUNCTIONAL BLOCK DIAGRAM

VREF SENSE

AGND

DrGND

DRVDD

AVDD

REFERENCE

AD9480

VIN+

VIN–

T&H

8-BIT

ADC

PIPELINE

CORE

LVDS

D7–D0

(LVDS)

CLK+

CLK–

CLOCK

MGMT

DCO+

DCO-

LOGIC

(LVDS)

04619-0-001

APPLICATIONS

Digital oscilloscopes

Instrumentation and measurement

Communications:

Point-to-point radios

Predistortion loops

PDWN

LVDSBIAS

Figure 1.

GENERAL DESCRIPTION

The AD9480 is an 8-bit, monolithic analog-to-digital converter

optimized for high speed and low power consumption. Small in

size and easy to use, the product operates at a 250 MSPS

conversion rate, with excellent linearity and dynamic

performance over its full operating range.

To minimize system cost and power dissipation, the AD9480

includes an internal reference and track-and-hold circuit. The

user only provides a 3.3 V power supply and a differential

encode clock. No external reference or driver components are

required for many applications.

The digital outputs are LVDS (ANSI 644) compatible with an

option of twos complement or binary output format. The output

data bits are provided in parallel fashion along with an LVDS

output clock, which simplifies data capture.

Fabricated on an advanced BiCMOS process, the AD9480 is

available in a 44-lead surface-mount package (TQFP) specified

over the industrial temperature range (−40°C to +85°C).

PRODUCT HIGHLIGHTS

Superior linearity.

A DNL of ±0.25 makes the AD9480 suitable for

instrumentation and measurement applications.

Power-down mode.

A power-down function may be exercised to bring total

consumption down to 15 mW.

LVDS outputs (ANSI-644).

LVDS outputs simplify timing and improve noise

performance.

Rev. 0

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.

Specifications subject to change without notice. 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 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

AD9480

TABLE OF CONTENTS

DC Specifications ............................................................................. 3

Digital Specifications........................................................................ 4

AC Specifications.............................................................................. 5

Switching Specifications .................................................................. 6

Timing Diagram ........................................................................... 6

Absolute Maximum Ratings............................................................ 7

Explanation of Test Levels........................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Definitions ......................................................................................... 9

Equivalent Circuits ......................................................................... 11

Application Notes ........................................................................... 12

Clocking the AD9480................................................................. 12

Analog Inputs.............................................................................. 12

Voltage Reference ....................................................................... 13

Digital Outputs ........................................................................... 14

Output Coding............................................................................ 14

Interleaving Two AD9480s........................................................ 14

Data Clock Out........................................................................... 14

Typical Performance Characteristics ........................................... 15

AD9480 Evaluation Board ............................................................ 19

Power Connector........................................................................ 19

Analog Inputs.............................................................................. 19

Gain.............................................................................................. 19

Optional Operational Amplifier............................................... 19

Clock ............................................................................................ 19

Optional Clock Buffer ............................................................... 19

Optional XTAL ........................................................................... 19

Voltage Reference ....................................................................... 20

Data Outputs............................................................................... 20

Evaluation Board Bill of Materials ............................................... 21

PCB Schematics .............................................................................. 22

PCB Layers ...................................................................................... 24

Outline Dimensions ....................................................................... 26

Ordering Guide .......................................................................... 27

REVISION HISTORY

7/04—Revision 0: Initial Version

Rev. 0 | Page 2 of 28

AD9480 Related Products

	AD9480	AD9480-LVDS-PCB3
Description	8-Bit, 250 MSPS 3.3 V A/D Converter	8-Bit, 250 MSPS 3.3 V A/D Converter

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