MSP430F6638IPZ datasheet(46/133 Pages) TI

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8.39 12-Bit ADC, Linearity Parameters Using an External Reference Voltage

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Integral linearity error(2)

1.4 V ≤ dVREF ≤ 1.6 V(1)

2.2 V, 3 V

±2

LSB

1.6 V < dVREF (1)

±1.7

Differential linearity error(2)

See (1)

2.2 V, 3 V

±1

LSB

Offset error(3)

dVREF ≤ 2.2 V(1)

2.2 V, 3 V

±3

±5.6

LSB

dVREF > 2.2 V(1)

2.2 V, 3 V

±1.5

±3.5

Gain error(3)

See (1)

2.2 V, 3 V

±1

±2.5

LSB

Total unadjusted error

dVREF ≤ 2.2 V(1)

2.2 V, 3 V

±3.5

±7.1

LSB

dVREF > 2.2 V(1)

2.2 V, 3 V

±2

±5

(1)

The external reference voltage is selected by: SREF2 = 0 or 1, SREF1 = 1, SREF0 = 0. dVREF = VR+ - VR-. VR+ < AVCC. VR- > AVSS.

Unless otherwise mentioned, dVREF > 1.5 V. Impedance of the external reference voltage R < 100 Ω, and two decoupling capacitors,

10 µF and 100 nF, should be connected to VREF+/VREF- to decouple the dynamic current. See also the MSP430F5xx and

MSP430F6xx Family User's Guide.

(2)

Parameters are derived using the histogram method.

(3)

Parameters are derived using a best fit curve.

8.40 12-Bit ADC, Linearity Parameters Using AVCC as Reference Voltage

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Integral linearity error(2)

See (1)

2.2 V, 3 V

±1.7

LSB

Differential linearity error(2)

See (1)

2.2 V, 3 V

±1

LSB

Offset error(3)

See (1)

2.2 V, 3 V

±1

±2

LSB

Gain error(3)

See (1)

2.2 V, 3 V

±2

±4

LSB

Total unadjusted error

See (1)

2.2 V, 3 V

±2

±5

LSB

(1)

AVCC as reference voltage is selected by: SREF2 = 0, SREF1 = 0, SREF0 = 0.

(2)

Parameters are derived using the histogram method.

(3)

Parameters are derived using a best fit curve.

8.41 12-Bit ADC, Linearity Parameters Using the Internal Reference Voltage

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

PARAMETER

TEST CONDITIONS(1)

VCC

MIN

TYP

MAX

UNIT

Integral linearity error(2)

ADC12SR = 0, REFOUT = 1

fADC12CLK ≤ 4.0 MHz

2.2 V, 3 V

±1.7

LSB

ADC12SR = 0, REFOUT = 0

fADC12CLK ≤ 2.7 MHz

±2.5

Differential

linearity error(2)

ADC12SR = 0, REFOUT = 1

fADC12CLK ≤ 4.0 MHz

2.2 V, 3 V

–1

+1.5

LSB

ADC12SR = 0, REFOUT = 1

fADC12CLK ≤ 2.7 MHz

±1

ADC12SR = 0, REFOUT = 0

fADC12CLK ≤ 2.7 MHz

–1

+2.5

Offset error(3)

ADC12SR = 0, REFOUT = 1

fADC12CLK ≤ 4.0 MHz

2.2 V, 3 V

±2

±4

LSB

ADC12SR = 0, REFOUT = 0

fADC12CLK ≤ 2.7 MHz

±2

±4

Gain error(3)

ADC12SR = 0, REFOUT = 1

fADC12CLK ≤ 4.0 MHz

2.2 V, 3 V

±1

±2.5

LSB

ADC12SR = 0, REFOUT = 0

fADC12CLK ≤ 2.7 MHz

±1%(4)

VREF

Total unadjusted error

ADC12SR = 0, REFOUT = 1

fADC12CLK ≤ 4.0 MHz

2.2 V, 3 V

±2

±5

LSB

ADC12SR = 0, REFOUT = 0

fADC12CLK ≤ 2.7 MHz

±1%(4)

VREF

(1)

The external reference voltage is selected by: SREF2 = 0, SREF1 = 0, SREF0 = 1. dVREF = VR+ - VR-.

(2)

Parameters are derived using the histogram method.

(3)

Parameters are derived using a best fit curve.

(4)

The gain error and the total unadjusted error are dominated by the accuracy of the integrated reference module absolute accuracy. In

this mode the reference voltage used by the ADC12_A is not available on a pin.

MSP430F6638, MSP430F6637, MSP430F6636, MSP430F6635, MSP430F6634

MSP430F6633, MSP430F6632, MSP430F6631, MSP430F6630

SLAS566G – JUNE 2010 – REVISED SEPTEMBER 2020

www.ti.com

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MSP430F6638IPZ Datasheet(PDF) 46 Page - Texas Instruments

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