12-Bit, 170 MSPS/210 MSPS/250 MSPS,

1.8 V Analog-to-Digital Converter

AD9626

Rev. 0

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FEATURES

Excellent linearity

DNL = ±0.3 LSB typical

INL = ±0.7 LSB typical

CMOS outputs

Single data port at up to 250 MHz

Interleaved dual port @ ½ sample rate up to 125 MHz

700 MHz full power analog bandwidth

On-chip reference, no external decoupling required

Integrated input buffer and track-and-hold

Low power dissipation

272 mW @ 170 MSPS

364 mW @ 250 MSPS

Programmable input voltage range

1.0 V to 1.5 V, 1.25 V nominal

1.8 V analog and digital supply operation

Selectable output data format (offset binary, twos

complement, Gray code)

Clock duty cycle stabilizer

Integrated data capture clock

APPLICATIONS

Wireless and wired broadband communications

Cable reverse path

Communications test equipment

Radar and satellite subsystems

Power amplifier linearization

FUNCTIONAL BLOCK DIAGRAM

AGND

PWDN

RBIAS

AVDD (1.8V)

VIN+

VIN–

CML

TRACK-AND-HOLD

REFERENCE

ADC

12-BIT

CORE

OUTPUT

STAGING

LVDS

CLK+

CLK–

CLOCK

MANAGEMENT

SERIAL PORT

RESET SCLK SDIO CSB

DCO–

DCO+

OVRB

OVRA

Dx11 TO Dx0

DRGND

DRVDD

12

12

AD9626

Figure 1.

GENERAL DESCRIPTION

The AD9626 is a 12-bit monolithic sampling analog-to-digital

converter optimized for high performance, low power, and ease

of use. The product operates at up to a 250 MSPS conversion

rate and is optimized for outstanding dynamic performance in

wideband carrier and broadband systems. All necessary func-

tions, including a track-and-hold (T/H) and voltage reference,

are included on the chip to provide a complete signal

conversion solution.

The ADC requires a 1.8 V analog voltage supply and a differen-

tial clock for full performance operation. The digital outputs are

CMOS compatible and support either twos complement, offset

binary format, or Gray code. A data clock output is available for

proper output data timing.

Fabricated on an advanced CMOS process, the AD9626 is

available in a 56-lead LFCSP, specified over the industrial

temperature range (−40°C to +85°C).

PRODUCT HIGHLIGHTS

1.

High Performance—Maintains 64.9 dBFS SNR @ 250 MSPS

with a 70 MHz input.

2.

Low Power—Consumes only 364 mW @ 250 MSPS.

3.

Ease of Use—CMOS output data and output clock signal

allow interface to current FPGA technology. The on-chip

reference and sample-and-hold provide flexibility in

system design. Use of a single 1.8 V supply simplifies

system power supply design.

4.

Serial Port Control—Standard serial port interface supports

various product functions, such as data formatting, clock

duty cycle stabilizer, power-down, gain adjust, and output

test pattern generation.

5.

Pin-Compatible Family—10-bit pin-compatible family

offered as the AD9601.