MSP430F14X datasheet(28/83 Pages) TI

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1 µF

1 ms

10 ms

100 ms

. Setting Time

REFON

≈ 0.66 × C

[ms], with C

in µF

REFON

VREF+

100 µF

10 µF

MSP430F149, MSP430F148, MSP430F147

MSP430F1491, MSP430F1481, MSP430F1471

MSP430F135, MSP430F133

SLAS272H – JULY 2000 – REVISED MAY 2018

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Product Folder Links: MSP430F149 MSP430F148 MSP430F147 MSP430F1491 MSP430F1481 MSP430F1471

MSP430F135 MSP430F133

Specifications

(1)

Not production tested, limits characterized

(2)

Not production tested, limits verified by design

(3)

The internal buffer operational amplifier and the accuracy specifications require an external capacitor. All INL and DNL tests uses two

capacitors between pins VREF+ and AVSS and VREF−/VeREF− and AVSS: 10-µF tantalum and 100-nF ceramic.

(4)

The condition is that the error in a conversion started after tREFON is less than ±0.5 LSB. The settling time depends on the external

capacitive load.

5.25 12-Bit ADC, Built-In Reference

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

VREF+

Positive built-in reference

voltage output

REF2_5V = 1 for 2.5 V,

IVREF+ ≤ IVREF+(max)

3 V

2.4

2.5

2.6

REF2_5V = 0 for 1.5 V,

IVREF+ ≤ IVREF+(max)

2.2 V, 3 V

1.44

1.5

1.56

AVCC(min)

AVCC minimum voltage,

positive built-in reference

active

REF2_5V = 0, IVREF+ ≤ 1 mA

2.2

REF2_5V = 1, IVREF+ ≤ 0.5 mA

VREF+ + 0.15

REF2_5V = 1, IVREF+ ≤ 1 mA

VREF+ + 0.15

IVREF+

Load current out of VREF+

terminal

2.2 V

0.01

–0.5

3 V

–1

IL(VREF)+

Load-current regulation, VREF+

terminal(1)

IVREF+ = 500 µA ±100 µA,

Analog input voltage

≈ 0.75 V,

REF2_5V = 0

2.2 V

±2

LSB

3 V

±2

IVREF+ = 500 µA ±100 µA,

Analog input voltage

≈ 1.25 V,

REF2_5V = 1

3 V

±2

LSB

IDL(VREF)+

Load-current regulation,

VREF+ terminal(2)

IVREF+ = 100 µA to 90 µA,

CVREF+ = 5 µF, VAx ≈ 0 5 × VREF+,

Error of conversion result

≤ 1 LSB

3 V

CVREF+

Capacitance at VREF+

terminal(3)

REFON = 1,

0 mA

≤ IVREF+ ≤ IVREF+(max)

2.2 V, 3 V

µF

TREF+

Temperature coefficient of

built-in reference(1)

IVREF+ is constant in the range of

0 mA

≤ IVREF+ ≤ 1 mA

2.2 V, 3 V

±100 ppm/°C

tREFON

Settling time of reference

voltage(4)(1) (see Figure 5-13)

IVREF+ = 0.5 mA, CVREF+ = 10 µF,

VVREF+ = 1.5 V, VAVCC = 2.2 V

Figure 5-13. Typical Settling Time of Internal Reference (tREFON) vs External Capacitor on VREF+

MSP430F14X Datasheet(PDF) 28 Page - Texas Instruments

MSP430F14X Datasheet(HTML) 28 Page - Texas Instruments

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