MSP430F4796IPZ Datasheet, PDF (47/89 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F47x
MIXED SIGNAL MICROCONTROLLER
SLAS629A -- MARCH 2009 -- REVISED APRIL 2009
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
12-bit DAC, linearity specifications (see Figure 20)
PARAMETER
Integral nonlinearity
INL
(see Note 1)
TEST CONDITIONS
V_REF,DAC12 = 1.2V or V_REF,ext = 2.5V
DAC12AMPx = 7, DAC12IR = 1
V_CC
2.7V
MIN TYP MAX UNIT
±2.0 ±8.0 LSB
Differential nonlinearity
DNL
(see Note 1)
V_REF,ext = 1.2V
DAC12AMPx = 7, DAC12IR = 1
V_REF,ext = 2.5V
DAC12AMPx = 7, DAC12IR = 1
2.7V
2.7V
--1 ±0.4 +1.3 LSB
±0.4 ±1.0 LSB
Offset voltage w/o calibration
(see Notes 1, 2)
V_{REF, DAC12} = 1.2 V, DAC12AMPx = 7,
DAC12IR = 1
2.7 V
E_O
Offset voltage with calibration V_{REF, DAC12} = 1.2 V, DAC12AMPx = 7,
2.7 V
(see Notes 1, 2)
DAC12IR = 1
±20
mV
±2.5
d_E(O)/d_T
E_G
d_E(G)/d_T
Offset error temperature
coefficient (see Note 1)
Gain error (see Note 1)
Gain temperature coefficient
(see Note 1)
V_{REF, DAC12} = 1.2 V
2.7 V
2.7 V
2.7 V
±30
µV/C
±3.50 % FSR
ppm of
10
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 =
AV _CC
2
CLoad = 100pF
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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