ADS5281IPFPR datasheet(5/41 Pages) TI

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ELECTRICAL CHARACTERISTICS

(1)

ADS5281

ADS5282

SBAS397E – DECEMBER 2006 – REVISED JANUARY 2008

Typical values at +25

°C. Minimum and maximum values are measured across the specified temperature range of T

MIN =

–40

°C to T

MAX = +85°C, AVDD = 3.3V, LVDD = 1.8V, clock frequency = 10MSPS to 65MSPS, 50% clock duty cycle, –1dBFS

differential analog input, internal reference mode, ISET resistor = 56.2kΩ, and LVDS buffer current setting = 3.5mA, unless

otherwise noted.

ADS528x

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INTERNAL REFERENCE VOLTAGES

VREFB

Reference bottom

0.5

VREFT

Reference top

2.5

VREFT – VREFB

1.95

2.0

2.05

VCM

Common-mode voltage (internal)

1.425

1.5

1.575

VCM output current

±2

EXTERNAL REFERENCE VOLTAGES

VREFB

Reference bottom

0.4

0.5

0.6

VREFT

Reference top

2.4

2.5

2.6

VREFT – VREFB

1.9

2.0

2.1

ANALOG INPUT

Differential input voltage range

2.0

VPP

Differential input capacitance

Analog input bandwidth

520

MHz

Analog input common-mode range

DC Coupled Input

VCM ± 0.05

Per input pin per MSPS of sampling

µA/MHz

Analog input common-mode current

2.5

speed

per pin

Recovery from 6dB overload to within 1%

Voltage overload recovery time

Clock cycle

accuracy

Standard deviation seen on a periodic

Voltage overload recovery repeatability

first data within full-scale range in a 6dB

LSB

overloaded sine wave

DC ACCURACY

Offset error

–1.25

±0.2

+1.25

%FS

Offset error temperature coefficient(2)

±5

ppm/

°C

Channel gain error

Excludes error in internal reference

–0.8

%FS

Channel gain error temperature

Excludes temperature coefficient of

±10

ppm/

°C

coefficient

internal reference

Internal reference error temperature

±15

ppm/

°C

coefficient(3)

DC PSRR

DC power-supply rejection ratio(4)

1.5

mV/V

POWER-DOWN MODES

Power in complete power-down mode

Power in partial power-down mode

Clock at 65MSPS

135

Power with no clock

DYNAMIC PERFORMANCE

5MHz full-scale signal applied to 7

Crosstalk

channels, measurement taken on channel

–90

dBc

with no input signal

Two-tone, third-order intermodulation

f1 = 9.5MHz at –7dBFs

–92

dBFS

distortion

f2 = 10.2MHz at –7dBFs

(1)

All characteristics are common for the ADS528x family.

(2)

The offset temperature coefficient in ppm/

°C is defined as (O

1 – O2) × 10

6/(T

1 – T2)/4096, where O1 and O2 are the offset codes in LSB

at the two extreme temperatures, T1 and T2.

(3)

The internal reference temperature coefficient is defined as (REF1 – REF2) × 10

6/(T

1 – T2)/2, where REF1 and REF2 are the internal

reference voltages (REFT – REFB) at the two extreme temperatures, T1 and T2.

(4)

DC PSRR is defined as the ratio of the change in the ADC output (expressed in mV) to the change in supply voltage (in volts).

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