MSP430X241X Datasheet, PDF (66/98 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430x241x, MSP430x261x
MIXED SIGNAL MICROCONTROLLER
SLAS541A -- JUNE 2007 -- REVISED OCTOBER 2007
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
12-bit ADC timing parameters
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP MAX UNIT
f_ADC12CLK
For specified performance of ADC12
linearity parameters
2.2V/3 V
0.45
5 6.3 MHz
f_ADC12OSC Internal ADC12 oscillator
t_CONVERT Conversion time
t_{ADC12ON‡}
Turn-on settling time of
the ADC
ADC12DIV = 0,
f_ADC12CLK = f_ADC12OSC
C_VREF+ ≥ 5 μF, Internal oscillator,
f_ADC12OSC = 3.7 MHz to 6.3 MHz
External f_ADC12CLK from ACLK, MCLK
or SMCLK, ADC12SSEL ≠ 0
2.2 V/ 3 V
2.2 V/ 3 V
See Note 1
3.7
5
2.06
13 × ADC12DIV
× 1/f_ADC12CLK
6.3 MHz
3.51
μs
100 ns
t_Sample‡
Sampling time
R_S = 400 Ω, R_I = 1000 Ω, C_I = 30 pF,
τ = [R_S + R_I] x C_I;(see Note 2)
3V
2.2 V
1220
1400
ns
† _{Limits characterized}
‡ _{Limits verified by design}
NOTES: 1. The condition is that the error in a conversion started after t_ADC12ON is less than ±0.5 LSB. The reference and input signal are already
settled.
2. Approximately ten Tau (τ) are needed to get an error of less than ±0.5 LSB:
t_Sample = ln(2ⁿ⁺¹) x (R_S + R_I) x C_I+ 800 ns where n = ADC resolution = 12, R_S = external source resistance.
12-bit ADC linearity parameters
PARAMETER
TEST CONDITIONS
E_I Integral linearity error
1.4 V ≤ (V_eREF+ -- V_REF--/V_eREF--) min ≤ 1.6 V
1.6 V < (V_eREF+ -- V_REF--/V_eREF--) min ≤ V_AVCC
E_D
Differential linearity error
(V_eREF+ -- V_REF--/V_eREF--)_min ≤ (V_eREF+ -- V_REF--/V_eREF--),
C_VREF+ = 10 μF (tantalum) and 100 nF (ceramic)
E_O Offset error
E_G Gain error
(V_eREF+ -- V_REF--/V_eREF--)_min ≤ (V_eREF+ -- V_REF--/V_eREF--),
Internal impedance of source R_S < 100 Ω,
C_VREF+ = 10 μF (tantalum) and 100 nF (ceramic)
(V_eREF+ -- V_REF--/V_eREF--)_min ≤ (V_eREF+ -- V_REF--/V_eREF--),
C_VREF+ = 10 μF (tantalum) and 100 nF (ceramic)
E_T Total unadjusted error
(V_eREF+ -- V_REF--/V_eREF--)_min ≤ (V_eREF+ -- V_REF--/V_eREF--),
C_VREF+ = 10 μF (tantalum) and 100 nF (ceramic)
VCC
2.2 V/3 V
2.2 V/3 V
MIN TYP
MAX
±2
±1.7
±1
UNIT
LSB
LSB
2.2 V/3 V
±2
±4 LSB
2.2 V/3 V
2.2 V/3 V
±1.1
±2 LSB
±2
±5 LSB
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