MSP430FG439 Datasheet, PDF (30/88 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FG439, MSP430FG438, MSP430FG437
SLAS380D – APRIL 2004 – REVISED NOVEMBER 2014
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5.25 12-Bit ADC, Timing Parameters
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
f_ADC12CLK ADC12 clock frequency
TEST CONDITIONS
For specified performance of ADC12
linearity parameters
V_CC
2.2 V, 3 V
MIN
0.45
TYP MAX UNIT
5 6.3 MHz
f_ADC12OSC
t_CONVERT
t_ADC12ON
Internal ADC12 oscillator
Conversion time
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
Turn on settling time of
the ADC
See ⁽¹⁾
2.2 V, 3 V
2.2 V, 3 V
3.7
2.06
5
13 ×
ADC12DIV ×
1/f_ADC12CLK
6.3 MHz
3.51 µs
µs
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 ⁽²⁾
3V
2.2 V
1220
1400
ns
(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) × (R_S + R_I) x C_I + 800 ns, where n = ADC resolution = 12, R_S = external source resistance.
5.26 12-Bit ADC, Linearity Parameters
over recommended operating free-air temperature range (unless otherwise noted)
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
(V_eREF+ – V_REF–/V_eREF–) min ≤ (V_eREF+ – V_REF–/V_eREF–),
Internal impedance of source RS < 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)
V_CC
2.2 V, 3 V
2.2 V, 3 V
2.2 V, 3 V
2.2 V, 3 V
2.2 V, 3 V
MIN TYP MAX UNIT
±2
LSB
±1.7
±1 LSB
±2
±4 LSB
±1.1
±2 LSB
±2
±5 LSB
30
Specifications
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