TLV2556IDW datasheet(6/37 Pages) TI

Part #	TLV2556IDW

Description	12-BIT, 200-KSPS, 11 CHANNEL, LOW POWER, SERIAL ADC WITH INTERNAL REFERENCE

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Manufacturer	TI [Texas Instruments]

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TLV2556

SLAS355A – DECEMBER 2001 – REVISED SEPTEMBER 2002

6

www.ti.com

external reference specifications

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

Reference input voltage REF

VCC = 4.5 V to 5.5 V

–0.1

0

0.1

V

Reference input voltage, REF–

VCC = 2.7 V to 3.6 V

–0.1

0

0.1

V

Reference input voltage REF

VCC = 4.5 V to 5.5 V

2

VCC

V

Reference input voltage, REF+

VCC = 2.7 V to 3.6 V

2

VCC

V

External reference input voltage difference,

VCC = 4.5 V to 5.5 V

1.9

VCC

V

External reference in ut voltage difference,

(REF+) – (REF–)

VCC = 2.7 V to 3.6 V

1.9

VCC

V

External reference supply current

CS at0V

VCC = 4.5 V to 5.5 V

1

mA

External reference supply current

CS at 0 V

VCC = 2.7 V to 3.6 V

0.7

mA

V5 V

Static

1

M

Ω

Reference input impedance

VCC = 5 V

During sampling/conversion

6

9

k

Ω

Reference input impedance

V2 7 V

Static

1

M

Ω

VCC = 2.7 V

During sampling/conversion

6

9

k

Ω

† All typical values are at VCC = 5 V, TA = 25°C.

NOTE: Add a 0.1-

µF capacitor between REF+ and REF– pins when external reference is used.

internal reference specifications

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

Reference input voltage, REF–

VCC = 2.7 V to 5.5 V, REF– = Analog GND

0

V

It

l

f

dlt

lt

VCC = 5.5 V,

Internal 4.096-Vref selected

3.95

4.065

4.25

Internal reference delta voltage,

(REF+) – (REF–)

VCC = 5.5 V,

Internal 2.048-Vref selected

1.95

2.019

2.1

V

(REF+) – (REF–)

VCC = 2.7 V,

Internal 2.048-Vref selected

1.95

2.019

2.1

V

Internal reference start up time

VCC = 5 V

With 10 F load

20

ms

Internal reference start-up time

VCC = 2.7 V

With 10-

µF load

20

ms

Internal reference temperature coefficient

VCC = 2.7 V to 5.5 V

±50

PPM/

°C

† All typical values are at VCC = 5 V, TA = 25°C.

NOTE: When an internal reference is used, the following conditions are required:

a) Add 0.1-

µF and 10-µF capacitors between REF+ and REF– pins.

b) REF– must be connected to analog GND (the ground pin of the ADC).

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