ADS8484 datasheet(3/32 Pages) TI1

Part #	ADS8484

Description	18-BIT, 1.25-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE,REFERENCE

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Manufacturer	TI1 [Texas Instruments]

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SPECIFICATIONS

ADS8484

SLAS511 – NOVEMBER 2007

TA = –40°C to 85°C, +VA = 5 V, +VBD = 3 V or 5 V, Vref = 4.096 V, fSAMPLE = 1.25 MSPS (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUT

Full-scale input voltage(1)

+IN – (–IN)

–Vref

Vref

V

+IN

–0.2

Vref + 0.2

Absolute input voltage

V

–IN

–0.2

Vref + 0.2

Common-mode input range

(Vref)/2 – 0.2

(Vref)/2 (Vref)/2 + 0.2

V

Input capacitance

65

pF

Input leakage current

1

nA

SYSTEM PERFORMANCE

Resolution

18

Bits

ADS8484I

18

No missing codes

Bits

ADS8484IB

18

ADS8484I

–4

±1.5

4

LSB

INL

Integral linearity (2)

(18 bit)(3)

ADS8484IB

–2.5

±1.5

2.5

ADS8484I

–1

–0.6/0.8

2

LSB

DNL

Differential linearity

(18 bit)

ADS8484IB

–1

–0.6/0.8

1.5

ADS8484I

–2

±1

2

Offset error(4)

mV

ADS8484IB

–0.5

±0.1

0.5

ADS8484I

±0.05

Offset error temperature drift

ppm/

°C

ADS8484IB

±0.05

ADS8484I

Vref = 4.096 V

–0.1

±0.035

0.1

%FS

EG

Gain error(4) (5)

ADS8484IB

Vref = 4.096 V

–0.1

±0.035

0.1

%FS

ADS8484I

±0.5

Gain error temperature drift

ppm/

°C

ADS8484IB

±0.5

At dc (±0.2 V around Vref/2)

60

CMRR

Common-mode rejection ratio

dB

+IN – (–IN) = 1 Vpp at 1.25 MHz

55

Noise

30

µV RMS

Power supply rejection ratio

At 1FFFFh output code

60

dB

SAMPLING DYNAMICS

Conversion time

575

610

ns

Acquisition time

175

200

ns

Throughput rate

1.25

MHz

Aperture delay

4

ns

Aperture jitter

5

ps

Step response

150

ns

Over voltage recovery

150

ns

(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 an ideal full-scale input [+IN – (–IN)] of 8.192 V

(5)

This specification does not include the internal reference voltage error and drift.

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