ADS8284_14 datasheet(8/46 Pages) TI1

Numer części	ADS8284

Szczegółowy opis	ADS8284 18-BIT, 1-MSPS, Pseudo-Bipolar Differential SAR ADC with On-Chip ADC Driver (OPA) and 4-Channel Differential Multiplexer

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Not Recommended for New Designs

ADS8284

SLAS628A – MARCH 2009 – REVISED APRIL 2014

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Electrical Characteristics (continued)

TA = –40°C to 85°C, VCC = 5 V, VEE = –5 V, +VA = 5 V, +VBD = 5 V or 3.3 V, Vref = 4 V, fSAMPLE = 1 MSPS (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ADS8284I

98.3

VIN = 4 Vpp at 2 kHz

dB

ADS8284IB

98.3

ADS8284I

97.2

Signal-to-noise + distortion

VIN = 4 Vpp at 10 kHz

dB

(SINAD)

ADS8284IB

97.2

ADS8284I

93.8

VIN = 4 Vpp at 100 kHz,

dB

LoPWR = 0

ADS8284IB

95.23

ADS8284I

121

VIN = 4 Vpp at 2 kHz

dB

ADS8284IB

121

ADS8284I

106

Spurious free dynamic

VIN = 4 Vpp at 10 kHz

dB

range (SFDR)

ADS8284IB

106

ADS8284I

101

VIN = 4 Vpp at 100 kHz,

dB

LoPWR = 0

ADS8284IB

101

–3dB small signal bandwidth

8

MHz

VOLTAGE REFERENCE INPUT (REFIN)

Reference voltage at REFIN, Vref

3.0

4.096

+VA – 0.8

V

Reference input current(6)

1

μA

INTERNAL REFERENCE OUTPUT (REFOUT)

Internal reference start-up time

From 95% (+VA), with 1-

μF storage capacitor

120

ms

Reference voltage range, Vref

4.081

4.096

4.111

V

Source current

Static load

10

μA

Line regulation

+VA = 4.75 V to 5.25 V

60

μV

Drift

IO = 0

±6

PPM/°C

BUFFERED REFERENCE OUTPUT (BUF-REF)

Output current

REFIN = 4 V, at 85°C

70

mA

REFERENCE/2 OUTPUT (VCMO)

Reference/2 Voltage Range

At No Load on VCMO

1.938

2.048

2.158

V

Output current

REFIN = 4 V, at +85°C

50

μA

ANALOG MULTIPLEXER

Number of channels

4

Channel to channel crosstalk

100 kHz i/p

–95

dB

Auto sequencer with selection of channel count or

Channel selection

manual selection through control lines

DIGITAL INPUT-OUTPUT

ADC CONTROL PINS

Logic Family-CMOS

VIH

IIH = 5 μA

+V BD–1

+VBD + 0.3

V

VIL

IIL = 5 μA

0.3

0.8

V

Logic level

VOH

IOH = 2 TTL loads

+VBD–0.6

+VBD

V

VOL

IOL = 2 TTL loads

0

0.4

V

MULTIPLEXER CONTROL PINS

Logic Family - CMOS

IIH

IIH = 5 μA

2.3

+VA +0.3

V

Logic level

IIL

IIL = 5 μA

–0.3

0.8

V

POWER CONTROL PINS

Logic Family - CMOS

VIH

IIH = 5 μA

2.3

+VA +0.3

V

Logic level

VIL

IIL = 5 μA

–0.3

0.8

V

(6)

Can vary ±20%

8

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