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MSP430F241X_11 Datasheet, PDF (67/107 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER | |||
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MSP430F241x, MSP430F261x
MIXED SIGNAL MICROCONTROLLER
SLAS541G -- JUNE 2007 -- REVISED MARCH 2011
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
12-bit ADC timing parameters
PARAMETER
fADC12CLK
TEST CONDITIONS
VCC
MIN
For specified performance of ADC12
linearity parameters
2.2V/3 V
0.45
TYP MAX UNIT
5 6.3 MHz
fADC12OSC Internal ADC12 oscillator
tCONVERT Conversion time
tADC12ONâ¡
Turn-on settling time of
the ADC
ADC12DIV = 0,
fADC12CLK = fADC12OSC
CVREF+ ï³ 5 ïF, Internal oscillator,
fADC12OSC = 3.7 MHz to 6.3 MHz
External fADC12CLK from ACLK, MCLK
or SMCLK, ADC12SSEL ï¹ 0
2.2 V/ 3 V
2.2 V/ 3 V
See Note 1
3.7
5
2.06
13 ï´ ADC12DIV
ï´ 1/fADC12CLK
6.3 MHz
3.51
ïs
100 ns
tSampleâ¡
Sampling time
RS = 400 ï, RI = 1000 ï, CI = 30 pF,
ï´ = [RS + RI] x CI;(see Note 2)
3V
2.2 V
1220
1400
ns
â Limits characterized
â¡ Limits verified by design
NOTES: 1. The condition is that the error in a conversion started after tADC12ON is less than ï±0.5 LSB. The reference and input signal are already
settled.
2. Approximately ten Tau (ï´) are needed to get an error of less than ï±0.5 LSB:
tSample = ln(2n+1) x (RS + RI) x CI+ 800 ns where n = ADC resolution = 12, RS = external source resistance.
12-bit ADC linearity parameters
PARAMETER
TEST CONDITIONS
EI Integral linearity error
1.4 V ï£ (VeREF+ -- VREF--/VeREF--) min ï£ 1.6 V
1.6 V < (VeREF+ -- VREF--/VeREF--) min ï£ VAVCC
ED
Differential linearity error
(VeREF+ -- VREF--/VeREF--)min ï£ (VeREF+ -- VREF--/VeREF--),
CVREF+ = 10 ïF (tantalum) and 100 nF (ceramic)
EO Offset error
EG Gain error
(VeREF+ -- VREF--/VeREF--)min ï£ (VeREF+ -- VREF--/VeREF--),
Internal impedance of source RS < 100 ï,
CVREF+ = 10 ïF (tantalum) and 100 nF (ceramic)
(VeREF+ -- VREF--/VeREF--)min ï£ (VeREF+ -- VREF--/VeREF--),
CVREF+ = 10 ïF (tantalum) and 100 nF (ceramic)
ET Total unadjusted error
(VeREF+ -- VREF--/VeREF--)min ï£ (VeREF+ -- VREF--/VeREF--),
CVREF+ = 10 ïF (tantalum) and 100 nF (ceramic)
VCC
2.2 V/3 V
2.2 V/3 V
MIN TYP
MAX
ï±2
ï±1.7
ï±1
UNIT
LSB
LSB
2.2 V/3 V
ï±2
ï±4 LSB
2.2 V/3 V
2.2 V/3 V
ï±1.1
ï±2 LSB
ï±2
ï±5 LSB
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67
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