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RECOMMENDED OPERATING CONDITIONS

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INITIALIZATION REGISTERS

ADS5281

ADS5282

SBAS397E – DECEMBER 2006 – REVISED JANUARY 2008

ADS528x

PARAMETER

MIN

TYP

MAX

UNIT

SUPPLIES, ANALOG INPUTS, AND REFERENCE VOLTAGES

AVDD

Analog supply voltage

3.0

3.3

3.6

V

LVDD

Digital supply voltage

1.7

1.8

1.9

V

Differential input voltage range

2

Input common-mode voltage

V

External reference mode

2.5

V

External reference mode

0.5

V

CLOCK INPUTS

10

50, 65

MSPS

Sine wave, ac-coupled

3.0

LVPECL, ac-coupled

1.6

LVDS, ac-coupled

0.7

0.6

V

2.2

V

Input clock duty cycle

50

%

DIGITAL OUTPUTS

10

1x (sample rate)

50, 65

MHz

60

6x (sample rate)

300, 390

MHz

Maximum external capacitance from each pin to LVSS

5

pF

Differential load resistance between the LVDS output pairs

100

Ω

Operating free-air temperature

–40

+85

°C

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All conditions are common to the ADS528x family.

After the device has been powered up, the following registers need to be written (in the exact order listed below) through the

serial interface as part of an initialization sequence.

ADDRESS (hex)

DATA (hex)

Initialization register 1

03

0002

Initialization register 2

01

0010

Initialization register 3

C7

8001

Initialization register 4

DE

01C0

If the analog input is ac-coupled, the following needs to be written in addition to the above registers.

ADDRESS (hex)

DATA (hex)

Initialization register 5

E2

00C0

The purpose of the above registers is to configure the device in the most optimum mode of operation.

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Product Folder Link(s): ADS5281 ADS5282