www.ti.com

RECOMMENDED OPERATING CONDITIONS

(1)

INITIALIZATION REGISTERS

ADS5281

ADS5282

SBAS397H – DECEMBER 2006 – REVISED MARCH 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

(1)

All conditions are common to the ADS528x family.

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

serial interface as part of an initialization sequence.

(1)

ADDRESS (hex)

DATA (hex)

03

0002

01

0010

C7

8001

DE

01C0

(1)

It is no longer necessary to write these initialization registers. However, customers who have already included them in their software can

continue to use them. Programming these registers does not affect device performance.

If the analog input is ac-coupled, the following registers must be written to in the order listed below.

ADDRESS (hex)

DATA (hex)

Initialization Register 1

01

0010

Initialization Register 5

E2

00C0

Copyright © 2006–2008, Texas Instruments Incorporated

Submit Documentation Feedback

3

Product Folder Link(s): ADS5281 ADS5282