參數(shù)資料
型號: MSP430FG4270IDL
廠商: TEXAS INSTRUMENTS INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 8 MHz, RISC MICROCONTROLLER, PDSO48
封裝: GREEN, PLASTIC, SSOP-48
文件頁數(shù): 27/66頁
文件大小: 1391K
代理商: MSP430FG4270IDL
MSP430FG42x0
MIXED SIGNAL MICROCONTROLLER
SLAS556A JULY 2007 REVISED AUGUST 2007
33
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 12)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
UNIT
Resolution
12-bit monotonic
12
bits
INL
Integral nonlinearity
(see Note 1)
VREF,DAC12 = 1.2 V,
DAC12AMPx = 7, DAC12IR = 1
2.7 V
±2.0
±8.0
LSB
DNL
Differential nonlinearity
(see Note 1)
VREF,DAC12 = 1.2 V,
DAC12AMPx = 7, DAC12IR = 1
2.7 V
±0.4
±1.0
LSB
EO
Offset voltage w/o
calibration
(see Notes 1, 2)
VREF,DAC12 = 1.2 V,
DAC12AMPx = 7, DAC12IR = 1
2.7 V
±20
mV
Offset voltage with
calibration
(see Notes 1, 2)
VREF,DAC12 = 1.2 V,
DAC12AMPx = 7, DAC12IR = 1
2.7 V
±2.5
mV
dE(O)/dT
Offset error
temperature coefficient
(see Note 1)
2.7 V
±30
μV/C
EG
Gain error (see Note 1)
VREF,DAC12 = 1.2 V
2.7 V
±3.50 % FSR
dE(G)/dT
Gain temperature
coefficient (see Note 1)
2.7 V
10
ppm of
FSR/
°C
Time for offset calibration
DAC12AMPx = 2
2.7 V
100
tOffset_Cal
Time for offset calibration
(see Note 3)
DAC12AMPx = 3, 5
2.7 V
32
ms
tOffset_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. VDAC12_xOUT = EO + (1 + EG) * (VREF,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 12. Linearity Test Load Conditions and Gain/Offset Definition
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