REF5045 datasheet(8/62 Pages) TI2

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ADS8881

SBAS547D – MAY 2013 – REVISED AUGUST 2015

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(1)

Ideal input span, does not include gain or offset error.

(2)

Specified for VCM = VREF / 2; see the Analog Input section for the effect of VCM on the full-scale input range.

(3)

LSB = least significant bit. 1 LSB at 18-bits is approximately 3.8 ppm.

(4)

This parameter is the endpoint INL, not best-fit.

(5)

Measured relative to actual measured reference.

8.5 Electrical Characteristics

All minimum and maximum specifications are at AVDD = 3 V, DVDD = 3 V, VREF = 5 V, VCM = VREF / 2 V,

and fSAMPLE = 1 MSPS, over the operating free-air temperature range, unless otherwise noted.

Typical specifications are at TA = 25°C, AVDD = 3 V, and DVDD = 3 V.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUT

Full-scale input span(1)(2)

AINP – AINN

–VREF

VREF

Operating input range(1)(2)

AINP

–0.1

VREF + 0.1

AINN

–0.1

VREF + 0.1

VCM

Input common-mode range

VREF / 2

VREF

Input capacitance

AINP and AINN terminal to GND

EXTERNAL REFERENCE INPUT

VREF

Input range

ADS8881C

ADS8881I

2.5

Reference input current

During conversion, 1-MHz sample rate, mid-

code

300

μA

Reference leakage current

250

CREF

Decoupling capacitor at the

REF input

µF

Input leakage current

During acquisition for dc input

SYSTEM PERFORMANCE

Resolution

Bits

NMC

No missing codes

Bits

DNL

Differential linearity

ADS8881C

–0.99

±0.6

LSB(3)

ADS8881I

–0.99

±0.7

1.5

INL

Integral linearity(4)

ADS8881C

–2

±1.2

LSB(3)

ADS8881I

–3

±1.5

Offset error(5)

–4

±1

Offset error drift with

temperature

±1.5

µV/°C

Gain error

–0.01

±0.005

0.01

%FSR

Gain error drift with

temperature

±0.15

ppm/°C

CMRR

Common-mode rejection

ratio

100

PSRR

Power-supply rejection ratio

At mid-code

Transition noise

0.7

LSB

SAMPLING DYNAMICS

tconv

Conversion time

500

710

tACQ

Acquisition time

290

Maximum throughput rate

with or without latency

1000

kHz

Aperture delay

Aperture jitter, RMS

Step response

Settling to 18-bit accuracy

290

Overvoltage recovery

Settling to 18-bit accuracy

290

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