MSP430FG439 Datasheet, PDF (32/88 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FG439, MSP430FG438, MSP430FG437
SLAS380D – APRIL 2004 – REVISED NOVEMBER 2014
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5.29 12-Bit DAC, Linearity Specifications
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 5-21)
PARAMETER
Resolution
TEST CONDITIONS
12-bit monotonic
V_CC
MIN TYP MAX UNIT
12
bits
INL
Integral nonlinearity⁽¹⁾
V_ref = 1.5 V,
DAC12AMPx = 7, DAC12IR = 1
V_ref = 2.5 V,
DAC12AMPx = 7, DAC12IR = 1
2.2 V
3V
±2.0 ±8.0 LSB
DNL
Differential nonlinearity⁽¹⁾
V_ref = 1.5 V,
DAC12AMPx = 7, DAC12IR = 1
V_ref = 2.5 V,
DAC12AMPx = 7, DAC12IR = 1
2.2 V
3V
±0.4 ±1.0 LSB
Offset voltage without calibration^{(1) (2)}
E_O
Offset voltage with calibration^{(1) (2)}
d_E(O)/d_T
E_G
Offset error temperature coefficient⁽¹⁾
Gain error⁽¹⁾
d_E(G)/d_T Gain temperature coefficient⁽¹⁾
V_ref = 1.5 V,
DAC12AMPx = 7, DAC12IR = 1
V_ref = 2.5 V,
DAC12AMPx = 7, DAC12IR = 1
V_ref = 1.5 V,
DAC12AMPx = 7, DAC12IR = 1
V_ref = 2.5 V,
DAC12AMPx = 7, DAC12IR = 1
V_REF = 1.5 V
V_REF = 2.5 V
2.2 V
3V
2.2 V
3V
2.2 V, 3 V
2.2 V
3V
2.2 V, 3 V
±21
mV
±2.5
±30
µV/°C
±3.5 %FSR
10
ppm of
FSR/°C
t_{Offset Cal} Time for offset calibration⁽³⁾
DAC12AMPx = 2
DAC12AMPx = 3, 5
DAC12AMPx = 4, 6, 7
2.2 V, 3 V
100
32 ms
6
(1) Parameters calculated from the best-fit curve from 0x0A to 0xFFF. The best-fit curve method is used to deliver coefficients "a" and "b" of
the first-order equation: y = a + b × x. V_{DAC12_xOUT} = E_O + (1 + E_G) × (V_eREF+ / 4095) × DAC12_xDAT, DAC12IR = 1.
(2) The offset calibration works on the output operational amplifier. Offset Calibration is triggered setting bit DAC12CALON.
(3) 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}. It is recommended that the DAC12 module be configured prior to initiating calibration. Port activity during calibration may affect
accuracy and is not recommended.
DAC Output
RLoad =
CLoad = 100pF
AVCC
2
DAC VOUT
V _R+
Ideal transfer
function
Offset Error
Positive
Negative
Gain Error
DAC Code
Figure 5-21. Linearity Test Load Conditions and Gain/Offset Definition
32
Specifications
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