ADS7882IPFBT datasheet(3/29 Pages) TI

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SPECIFICATIONS

ADS7882

www.ti.com ........................................................................................................................................................................................... SLAS630 – DECEMBER 2008

TA = –40°C to 85°C, +VA = 5 V, +VBD = 5 V or 3.3 V, Vref = 2.5 V, fsample = 3 MHz (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUT

Full-scale input span(1)

+IN – (–IN)

Vref

+IN

–0.2

Vref +0.2

Absolute input range

–IN

–0.2

0.2

Input capacitance

Input leakage current

500

SYSTEM PERFORMANCE

Resolution

Bits

No missing codes

Bits

Integral linearity(2)

–4

±1

LSB(3)

Differential linearity

–4

±1

LSB(3)

Offset error(4)

±1

Gain error(4)

±1.2

With common mode input signal = 200

Common-mode rejection ratio

mVp-p at 1 MHz

At FF0H output code, +VA = 4.75 V to 5.25

Power supply rejection

V , Vref = 2.50 V

SAMPLING DYNAMICS

+VDB = 5 V

280

Conversion time

nsec

+VDB = 3 V

280

+VDB = 5 V

Acquisition time

nsec

+VDB = 3 V

Maximum throughput rate

MHz

Aperture delay

nsec

Aperture jitter

psec

Step response

nsec

Overvoltage recovery

nsec

DYNAMIC CHARACTERISTICS

Total harmonic distortion(5)

VIN = 2.496 Vp-p at 0.1 MHz/2.5 Vref

–79.5

SNR

VIN = 2.496 Vp-p at 0.1 MHz/2.5 Vref

69.5

SINAD

VIN = 2.496 Vp-p at 0.1 MHz/2.5 Vref

68.5

SFDR

VIN = 2.496 Vp-p at 0.1 MHz/2.5 Vref

80.5

–3 dB Small signal bandwidth

MHz

EXTERNAL REFERENCE INPUT

Input VREF range

2.4

2.5

2.6

Resistance(6)

500

Ω

INTERNAL REFERENCE OUTPUT

From 95% (+VA), with 1-

µF storage

Start-up time

120

msec

capacitor on REFOUT to AGND

VREF range

IOUT = 0

2.425

2.5

2.575

Source current

Static load

µA

Line regulation

+VA = 4.75 V to 5.25 V

Drift

IOUT = 0

PPM/°C

(1)

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

(2)

This is endpoint INL, not best fit.

(3)

LSB means least significant bit.

(4)

Measured relative to actual measured reference.

(5)

Calculated on the first nine harmonics of the input frequency.

(6)

Can vary ±20%.

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