MSP430F241X_11 Datasheet, PDF (70/107 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F241x, MSP430F261x
MIXED SIGNAL MICROCONTROLLER
SLAS541G -- JUNE 2007 -- REVISED MARCH 2011
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
12-bit DAC linearity specifications (see Figure 41)
PARAMETER
TEST CONDITIONS
Resolution
12-bit monotonic
V_REF = 1.5 V
DAC12AMPx = 7, DAC12IR = 1
INL
Integral nonlinearity (see Note 1) _{VREF = 2.5 V}
DAC12AMPx = 7, DAC12IR = 1
V_CC
2.2 V
3V
MIN TYP MAX UNIT
12
bits
2.0 8.0 LSB
DNL
Differential nonlinearity
(see Note 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
V_REF = 1.5 V
Offset voltage without calibration ^{DAC12AMPx = 7, DAC12IR = 1}
(see Notes 1 and 2)
V_REF = 2.5 V
E_O
DAC12AMPx = 7, DAC12IR = 1
V_REF = 1.5 V
Offset voltage with calibration
DAC12AMPx = 7, DAC12IR = 1
(see Notes 1 and 2)
V_REF = 2.5 V
DAC12AMPx = 7, DAC12IR = 1
2.2 V
3V
2.2 V
3V
21
mV
2.5
d_E(O)/d_T
Offset error temperature
coefficient (see Note 1)
2.2 V/3 V
30
V/C
E_G
d_E(G)/d_T
Gain error (see Note 1)
Gain temperature
coefficient (see Note 1)
V_REF = 1.5 V
V_REF = 2.5 V
2.2 V
3V
2.2 V/3 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
2.2 V/3 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_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}. The DAC12 module should be configured prior to initiating calibration. Port activity during calibration may affect
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 41. Linearity Test Load Conditions and Gain/Offset Definition
70
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