MSP430F6433IPZ datasheet(49/128 Pages) TI

49 / 128 page

8.46 12-Bit DAC, Linearity Specifications

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

Figure 8-17)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Resolution

12-bit monotonic

bits

INL

Integral nonlinearity(2)

VeREF+ = 1.5 V, DAC12AMPx = 7, DAC12IR = 1

2.2 V

±2

±4(1)

LSB

VeREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1

3 V

±2

±4

DNL

Differential nonlinearity(2)

VeREF+ = 1.5 V, DAC12AMPx = 7, DAC12IR = 1

2.2 V

±0.4

±1(1)

LSB

VeREF+ = 2.5 V, DAC12AMPx = 7, DAC12IR = 1

3 V

±0.4

±1

Offset voltage

Without calibration(2) (3)

VeREF+ = 1.5 V,

DAC12AMPx = 7,

DAC12IR = 1

2.2 V

±21(1)

VeREF+ = 2.5 V,

DAC12AMPx = 7,

DAC12IR = 1

3 V

±21

With calibration(2) (3)

VeREF+ = 1.5 V,

DAC12AMPx = 7,

DAC12IR = 1

2.2 V

±1.5(1)

VeREF+ = 2.5 V,

DAC12AMPx = 7,

DAC12IR = 1

3 V

±1.5

dE(O)/dT

Offset error temperature

coefficient(2)

With calibration

2.2 V, 3 V

±10

µV/°C

Gain error

VeREF+ = 1.5 V

2.2 V

±2.5

%FSR

VeREF+ = 2.5 V

3 V

±2.5

dE(G)/dT

Gain temperature

coefficient(2)

2.2 V, 3 V

ppm of

FSR/

°C

tOffset_Cal

Time for offset

calibration(4)

DAC12AMPx = 2

2.2 V, 3 V

165

DAC12AMPx = 3, 5

DAC12AMPx = 4, 6, 7

16.5

(1)

This parameter is not production tested.

(2)

Parameters calculated from the best-fit curve from 0x0F to 0xFFF. The best-fit curve method is used to deliver coefficients "a" and "b"

of the first-order equation: y = a + bx. VDAC12_xOUT = EO + (1 + EG) × (VeREF+ / 4095) × DAC12_xDAT, DAC12IR = 1.

(3)

The offset calibration works on the output operational amplifier. Offset calibration is triggered by setting the DAC12CALON bit.

(4)

The offset calibration can be done if DAC12AMPx = {2, 3, 4, 5, 6, 7}. The output operational amplifier is switched off with DAC12AMPx

= {0, 1}. TI recommends configuring the DAC12 module before initiating calibration. Port activity during calibration may effect accuracy

and is not recommended.

R+

Gain Error

Offset Error

DAC Code

DAC V

OUT

Ideal transfer

function

Load

= 100 pF

Load

DAC Output

Positive

Negative

Figure 8-17. Linearity Test Load Conditions and Gain and Offset Definitions

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MSP430F6438, MSP430F6436, MSP430F6435, MSP430F6433

SLAS720F – AUGUST 2010 – REVISED SEPTEMBER 2020

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