MSP430FG47X Datasheet, PDF (47/91 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430FG47x
MIXED SIGNAL MICROCONTROLLER
SLAS580D -- OCTOBER 2008 -- REVISED MARCH 2011
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
12-bit DAC, linearity specifications (see Figure 20)
PARAMETER
TEST CONDITIONS
V_CC
MIN TYP MAX UNIT
INL
Integral nonlinearity
(see Note 1)
V_REF,DAC12 = 1.2 V or V_REF,ext = 2.5 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
2.0 8.0 LSB
DNL
Differential nonlinearity
(see Note 1)
V_REF,ext = 1.2 V
DAC12AMPx = 7, DAC12IR = 1
V_REF,ext = 2.5 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
2.7 V
--1 0.4 +1.3 LSB
0.4 1.0 LSB
DNL
Differential nonlinearity
(see Note 1)
V_REF,DAC12 = 1.2 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
0.4 1.0 LSB
E_O
d_E(O)/d_T
Offset voltage without
calibration
(see Notes 1, 2)
Offset voltage with
calibration
(see Notes 1, 2)
Offset error temperature
coefficient (see Note 1)
V_REF,DAC12 = 1.2 V
DAC12AMPx = 7, DAC12IR = 1
V_REF,DAC12 = 1.2 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
2.7 V
2.7 V
20
mV
2.5
30
V/C
E_G
d_E(G)/d_T
Gain error (see Note 1)
Gain temperature
coefficient (see Note 1)
V_REF,DAC12 = 1.2 V
2.7 V
2.7 V
3.50 % FSR
10
ppm of
FSR/C
t_{Offset_Cal}
Time for offset calibration
(see Note 3)
DAC12AMPx = 2
DAC12AMPx = 3,5
DAC12AMPx = 4,6,7
2.7 V
2.7 V
2.7 V
100
32 ms
6
NOTES:
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_REF,DAC12/4095) * 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
effect accuracy and is not recommended.
DAC Output
RLoad =
CLoad = 100pF
AV _CC
2
DAC VOUT
VR+
Ideal transfer
function
Offset Error
Positive
Negative
Gain Error
DAC Code
Figure 20. Linearity Test Load Conditions and Gain/Offset Definition
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47