MSP430FG47x
MIXED SIGNAL MICROCONTROLLER
SLAS580D -- OCTOBER 2008 -- REVISED MARCH 2011
47
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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
V
REF,ext
= 1.2 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
--1
0.4
+1.3
LSB
DNL
Differential nonlinearity
(see Note 1)
V
REF,ext
= 2.5 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
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
Offset voltage without
calibration
(see Notes 1, 2)
V
REF,DAC12
= 1.2 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
20
mV
E
O
Offset voltage with
calibration
(see Notes 1, 2)
V
REF,DAC12
= 1.2 V
DAC12AMPx = 7, DAC12IR = 1
2.7 V
2.5
mV
d
E(O)
/d
T
Offset error temperature
coefficient (see Note 1)
2.7 V
30
V/C
E
G
Gain error (see Note 1)
V
REF,DAC12
= 1.2 V
2.7 V
3.50
% FSR
d
E(G)
/d
T
Gain temperature
coefficient (see Note 1)
2.7 V
10
ppm of
FSR/
C
Time for offset calibration
DAC12AMPx = 2
2.7 V
100
t
Offset Cal
Time for offset calibration
(see Note 3)
DAC12AMPx = 3,5
2.7 V
32
ms
t
Offset_Cal
(see Note 3)
DAC12AMPx = 4,6,7
2.7 V
6
ms
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.
Positive
Negative
VR+
Gain Error
Offset Error
DAC Code
DAC VOUT
Ideal transfer
function
RLoad =
AVCC
CLoad = 100pF
2
DAC Output
Figure 20. Linearity Test Load Conditions and Gain/Offset Definition
Содержание MSP430FG47x
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