SLAS787 datasheet(28/52 Pages) TI2

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MSP430G2231-Q1

SLAS787B – NOVEMBER 2011 – REVISED MARCH 2014

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9.24 10-Bit ADC, Built-In Voltage Reference

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

IVREF+ ≤ 1 mA, REF2_5V = 0

2.2

Positive built-in reference

VCC,REF+

analog supply voltage range I

VREF+ ≤ 1 mA, REF2_5V = 1

2.9

IVREF+ ≤ IVREF+max, REF2_5V = 0

1.41

1.5

1.59

Positive built-in reference

VREF+

3 V

voltage

IVREF+ ≤ IVREF+max, REF2_5V = 1

2.35

2.5

2.65

Maximum VREF+ load

ILD,VREF+

3 V

±1

current

IVREF+ = 500 µA ± 100 µA,

Analog input voltage VAx ≈ 0.75 V,

±2

REF2_5V = 0

VREF+ load regulation

3 V

LSB

IVREF+ = 500 µA ± 100 µA,

Analog input voltage VAx ≈ 1.25 V,

±2

REF2_5V = 1

IVREF+ = 100 µA → 900 µA,

VREF+ load regulation

VAx ≈ 0.5 × VREF+,

3 V

400

response time

Error of conversion result

≤ 1 LSB,

ADC10SR = 0

Maximum capacitance at

CVREF+

IVREF+ ≤ ±1 mA, REFON = 1, REFOUT = 1

3 V

100

pin VREF+

ppm/

TCREF+

Temperature coefficient

IVREF+ = const with 0 mA ≤ IVREF+ ≤ 1 mA

3 V

±100

°C

Settling time of internal

IVREF+ = 0.5 mA, REF2_5V = 0,

tREFON

reference voltage to 99.9%

3.6 V

µs

REFON = 0

→ 1

VREF

IVREF+ = 0.5 mA,

Settling time of reference

tREFBURST

REF2_5V = 1, REFON = 1,

3 V

µs

buffer to 99.9% VREF

REFBURST = 1, ADC10SR = 0

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