ADS5270

www.ti.com............................................................................................................................................... SBAS293F – JANUARY 2004 – REVISED JANUARY 2009

ELECTRICAL CHARACTERISTICS (continued)

TMIN = –40°C and TMAX = +85°C. Typical values are at TA = +25°C, clock frequency = maximum specified, 50% clock duty

cycle, AVDD = 3.3V, LVDD = 3.3V, –1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per

channel, unless otherwise noted.

ADS5270

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ANALOG INPUT

Differential Input Capacitance

4.0

pF

Analog Input Common-Mode Range

VCM ± 50

mV

Differential Full-Scale Input Voltage Range

Internal Reference

2.03

VPP

External Reference

2.03 × (VREFT – VREFB)

VPP

Voltage Overload Recovery Time(7)

3.0

CLK Cycles

–3dBFS, 25

Ω Series

Input Bandwidth

300

MHz

Resistances

DIGITAL DATA INPUTS

VIH High-Level Input Voltage

2.2

V

VIL Low-Level Input Voltage

0.6

V

CIN Input Capacitance

3.0

pF

DIGITAL DATA OUTPUTS

Data Format

Straight Offset Binary

Data Bit Rate

240

480

Mbps

SERIAL INTERFACE

SCLK Serial Clock Input Frequency

20

MHz

(7)

A differential ON/OFF pulse is applied to the ADC input. The differential amplitude of the pulse in its ON (high) state is twice the

full-scale range of the ADC, while the differential amplitude of the pulse in its OFF (low) state is zero. The overload recovery time of the

ADC is measured as the time required by the ADC output code to settle within 1% of full-scale, as measured from its mid-code value

when the pulse is switched from ON (high) to OFF (low).

REFERENCE SELECTION

MODE

INT/EXT

DESCRIPTION

Internal Reference; FSR = 2.03VPP

1

Default with internal pull-up.

Internal reference is powered down. The common-mode voltage

External Reference; FSR = 2.03 × (REFT – REFB)

0

of the external reference should be within 50mV of VCM. VCM is

derived from the internal bandgap voltage.

Copyright © 2004–2009, Texas Instruments Incorporated

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