EXTERNAL REFERENCE SPECIFICATIONS

(1)

INTERNAL REFERENCE SPECIFICATIONS

(1)

TLV2556-EP

SLAS598A – NOVEMBER 2008 – REVISED JULY 2009 ................................................................................................................................................... www.ti.com

PARAMETER

TEST CONDITIONS

MIN TYP(2)

MAX

UNIT

VCC = 4.5 V to 5.5 V

–0.1

0

0.1

Reference input voltage, REF–

V

VCC = 2.7 V to 3.6 V

–0.1

0

0.1

VCC = 4.5 V to 5.5 V

2

VCC

Reference input voltage, REF+

V

VCC = 2.7 V to 3.6 V

2

VCC

VCC = 4.5 V to 5.5 V

1.9

VCC

External reference input voltage

V

difference, (REF+) – (REF–)

VCC = 2.7 V to 3.6 V

1.9

VCC

VCC = 4.5 V to 5.5 V

1

External reference supply current

CS = 0 V

mA

VCC = 2.7 V to 3.6 V

0.7

Static

1

M

Ω

VCC = 5 V

During sampling/conversion

9

k

Ω

Reference input impedance

Static

1

M

Ω

VCC = 2.7 V

During sampling/conversion

9

k

Ω

(1)

Add a 0.1-

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

(2)

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

PARAMETER

TEST CONDITIONS

MIN TYP(2)

MAX

UNIT

Reference input voltage, REF–

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

0

V

VCC = 5.5 V, Internal 4.096-V VREF selected

3.95

4.065

4.25

Internal reference voltage delta, (REF+) – (REF–)

VCC = 5.5 V, Internal 2.048-V VREF selected

1.94

2.019

2.15

V

VCC = 2.7 V, Internal 2.048-V VREF selected

1.94

2.019

2.15

VCC = 5 V

20

Internal reference start up time

With 10-

µF load

ms

VCC = 2.7 V

20

Internal reference temperature coefficient

VCC = 2.7 V to 5.5 V

±50

ppm/°C

(1)

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).

(2)

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

6

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