8-Bit, 250 MSPS, 1.8 V Dual

Analog-to-Digital Converter (ADC)

Data Sheet

AD9284

Rev. A

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FEATURES

Single 1.8 V supply operation

SNR: 49.3 dBFS at 200 MHz input at 250 MSPS

SFDR: 65 dBc at 200 MHz input at 250 MSPS

Low power: 314 mW at 250 MSPS

On-chip reference and track-and-hold

1.2 V p-p analog input range for each channel

Differential input with 500 MHz bandwidth

LVDS-compliant digital output

DNL: ±0.2 LSB

Serial port control options

Offset binary, Gray code, or twos complement data format

Optional clock duty cycle stabilizer

Built-in selectable digital test pattern generation

Pin-programmable power-down function

Available in 48-lead LFCSP

APPLICATIONS

Communications

Diversity radio systems

I/Q demodulation systems

Battery-powered instruments

Handheld scope meters

Low cost digital oscilloscopes

OTS: video over fiber

GENERAL DESCRIPTION

The AD9284 is a dual 8-bit, monolithic sampling, analog-to-digital

converter (ADC) that supports simultaneous operation and is

optimized for low cost, low power, and ease of use. Each ADC

operates at up to a 250 MSPS conversion rate with outstanding

dynamic performance.

The ADC requires a single 1.8 V supply and an encode clock for

full performance operation. No external reference components

are required for many applications. The digital outputs are LVDS

compatible.

The AD9284 is available in a Pb-free, 48-lead LFCSP that is

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

PRODUCT HIGHLIGHTS

1. Integrated Dual 8-Bit, 250 MSPS ADC.

2. Single 1.8 V Supply Operation with LVDS Outputs.

3. Power-Down Option Controlled via a Pin-Programmable

Setting.

FUNCTIONAL BLOCK DIAGRAM

AD9284

CLK+

CLK–

VIN+A

VIN–A

VREF

VCM

ADC

ADC

SPI

CLOCK

MANAGEMENT

VIN–B

VIN+B

SDIO/

PWDN

OE

SCLK

CSB

×1.5

1.0V

REF

SELECT

D7+ (MSB), D7– (MSB)

D0+ (LSB), D0– (LSB)

(CHANNEL A)

D7+ (MSB), D7– (MSB)

D0+ (LSB), D0– (LSB)

(CHANNEL B)

DCO

GENERATION

DCO+

DCO–

RBIAS

AGND

AVDD

DRVDD

DRGND

Figure 1.