TLV2556

SLAS355B – DECEMBER 2001 – REVISED DECEMBER 2015

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Electrical Characteristics (continued)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

600

Analog inputs

Ω

500

Analog inputs

45

55

Input capacitance

pF

Control inputs

5

15

(2)

The switch resistance is very nonlinear and varies with input voltage and supply voltage. This is the worst case.

6.6 External Reference Specifications

See

(1)

PARAMETER

TEST CONDITIONS

MAX

UNIT

–0.1

0

0.1

Reference input voltage, REF–

V

–0.1

0

0.1

2

Reference input voltage, REF+

V

2

1.9

External reference input voltage difference

V

(REF+ – REF–)

1.9

1

External reference supply current

CS = 0 V

mA

0.7

Static

1

M

Ω

During sampling or conversion

6

9

k

Ω

Reference input impedance

Static

1

M

Ω

During sampling or conversion

6

9

k

Ω

(1)

Add a 0.1-

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

(2)

6.7 Internal Reference Specifications

See

(1) (2) (3)

PARAMETER

TEST CONDITIONS

MAX

UNIT

Reference input voltage, REF–

0

V

Internal 4.096 V selected

3.95

4.065

4.25

Internal reference delta voltage,

Internal 2.048 V selected

1.95

2.019

2.1

V

(REF+ – REF–)

Internal 2.048 V selected

1.95

2.019

2.1

20

Internal reference start-up time

With 10-µF load

ms

20

Internal reference temperature coefficient

±50

ppm/°C

(1)

Add a 0.1-

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

(2)

Add a 0.1-

μF capacitor between REF+ and REF– pins.

(3)

REF- must be connected to analog GND (the ground of the ADC).

(4)

6

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