MSP430F249-EP_14 Datasheet, PDF (59/82 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F249-EP
MIXED SIGNAL MICROCONTROLLER
2008
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
ADC12DIV=0, f_ADC12CLK=f_ADC12OSC
2.2 V/ 3 V 3.7
5 6.3 MHz
t_CONVERT Conversion time
t_ADC12ON†
Turn-on settling
time of the ADC
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
See Note 1
2.2 V/ 3 V 2.06
3.51
13 × ADC12DIV × 1
μs
/f_ADC12CLK
100 ns
t_Sample†
Sampling time
R_S = 400 Ω, R_I = 1000 Ω, C_I = 30 pF
τ = [R_S + R_I] × C_I;(see Note 2)
3V
2.2 V
1220
1400
ns
† _{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
1.4 V ≤ (V_eREF+ − V_REF−/V_eREF−) min ≤ 1.6 V
E_I
Integral linearity error _{1.6 V < (VeREF+ − VREF−/VeREF−) min ≤ [VAVCC]}
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
(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)
E_G Gain error
(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
±1.7
±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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