MSP430F6433IPZ datasheet(47/128 Pages) TI

47 / 128 page

8.44 REF, Built-In Reference

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)(1)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX UNIT

VREF+

Positive built-in

reference voltage output

REFVSEL = {2} for 2.5 V,

REFON = REFOUT = 1 , IVREF+ = 0 A

3 V

2.5

±1%

REFVSEL = {1} for 2 V,

REFON = REFOUT = 1, IVREF+ = 0 A

3 V

2.0

±1%

REFVSEL = {0} for 1.5 V,

REFON = REFOUT = 1, IVREF+ = 0 A

2.2 V, 3 V

1.5

±1%

AVCC(min)

AVCC minimum voltage,

Positive built-in

reference active

REFVSEL = {0} for 1.5 V

2.2

REFVSEL = {1} for 2 V

2.3

REFVSEL = {2} for 2.5 V

2.8

IREF+

Operating supply current

into AVCC terminal (2) (7)

ADC12SR = 1(8), REFON = 1, REFOUT = 0,

REFBURST = 0

3 V

100

µA

ADC12SR = 1(8), REFON = 1, REFOUT = 1,

REFBURST = 0

0.45

0.75

ADC12SR = 0(8), REFON = 1, REFOUT = 0,

REFBURST = 0

210

310

µA

ADC12SR = 0(8), REFON = 1, REFOUT = 1,

REFBURST = 0

0.95

1.7

IL(VREF+)

Load-current regulation,

VREF+ terminal(3)

REFVSEL = {0, 1, 2},

IVREF+ = +10 µA , –1000 µA,

AVCC = AVCC(min) for each reference level,

REFVSEL = {0, 1, 2}, REFON = REFOUT = 1

1500

2500 µV/mA

CVREF+

Capacitance at VREF+

terminal

REFON = REFOUT = 1(6),

0 mA ≤ IVREF+ ≤ IVREF+(max)

2.2 V, 3 V

100

TCREF+

Temperature coefficient

of built-in reference(4)

IVREF+ is a constant in the range

of 0 mA ≤ IVREF+ ≤ –1 mA

REFOUT = 0

2.2 V, 3 V

ppm/

°C

TCREF+

Temperature coefficient

of built-in reference(4)

IVREF+ is a constant in the range

of 0 mA ≤ IVREF+ ≤ –1 mA

REFOUT = 1

2.2 V, 3 V

ppm/

°C

PSRR_DC

Power supply rejection

ratio (DC)

AVCC = AVCC(min) to AVCC(max),

TA = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,

REFOUT = 0 or 1

120

300

µV/V

PSRR_AC

Power supply rejection

ratio (AC)

AVCC = AVCC(min) to AVCC(max),

TA = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,

REFOUT = 0 or 1

mV/V

tSETTLE

Settling time of reference

voltage(5)

AVCC = AVCC(min) to AVCC(max),

REFVSEL = {0, 1, 2}, REFOUT = 0,

REFON = 0 → 1

µs

AVCC = AVCC(min) to AVCC(max),

CVREF = CVREF(max), REFVSEL = {0, 1, 2},

REFOUT = 1, REFON = 0 → 1

(1)

The reference is supplied to the ADC by the REF module and is buffered locally inside the ADC. The ADC uses two internal buffers,

one smaller and one larger for driving the VREF+ terminal. When REFOUT = 1, the reference is available at the VREF+ terminal, as well

as, used as the reference for the conversion and uses the larger buffer. When REFOUT = 0, the reference is only used as the

reference for the conversion and uses the smaller buffer.

(2)

The internal reference current is supplied by the AVCC terminal. Consumption is independent of the ADC12ON control bit, unless a

conversion is active. REFOUT = 0 represents the current contribution of the smaller buffer. REFOUT = 1 represents the current

contribution of the larger buffer without external load.

(3)

Contribution only due to the reference and buffer including package. This does not include resistance due to PCB traces or other

external factors.

(4)

Calculated using the box method: (MAX(–40°C to +85°C) – MIN(–40°C to +85°C)) / MIN(–40°C to +85°C)/(85°C – (–40°C)).

(5)

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 when REFOUT = 1.

(6)

Connect two decoupling capacitors, 10 µF and 100 nF, to VREF to decouple the dynamic current required for an external reference

source if it is used for the ADC12_A. Also see the MSP430F5xx and MSP430F6xx Family User's Guide.

www.ti.com

MSP430F6438, MSP430F6436, MSP430F6435, MSP430F6433

SLAS720F – AUGUST 2010 – REVISED SEPTEMBER 2020

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