MSP430FR5994 Datasheet, PDF (54/166 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR5994, MSP430FR59941, MSP430FR5992, MSP430FR5964, MSP430FR5962
SLASE54 – MARCH 2016
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Table 5-24 lists the timing parameters.
Table 5-24. 12-Bit ADC, Timing Parameters
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
f_ADC12CLK
Frequency for specified
performance
For specified performance of ADC12 linearity
parameters with ADC12PWRMD = 0,
If ADC12PWRMD = 1, the maximum is 1/4 of the
0.45
value shown here
5.4
MHz
f_ADC12CLK
Frequency for reduced
performance
Linearity parameters have reduced performance
32.768
kHz
f_ADC12OSC Internal oscillator⁽¹⁾
ADC12DIV = 0, f_ADC12CLK = f_ADC12OSC from
MODCLK
4
4.8 5.4
MHz
t_CONVERT
Conversion time
REFON = 0, Internal oscillator,
f_ADC12CLK = f_ADC12OSC from MODCLK,
ADC12WINC = 0
2.6
3.5
µs
External f_ADC12CLK from ACLK, MCLK, or SMCLK,
(2)
ADC12SSEL ≠ 0
t_ADC12ON
Turnon settling time of the ADC See ⁽³⁾
100
ns
t_ADC12OFF
Time ADC must be off before
can be turned on again
Note: t_ADC12OFF must be met to make sure that
t_ADC12ON time holds
100
ns
t_Sample
Sampling time
R_S = 400 Ω, R_I = 4 kΩ, C_I = 15 pF, C_pext= 8 pF⁽⁴⁾
1
µs
(1) The ADC12OSC is sourced directly from MODOSC inside the UCS.
(2) 14 x ADC12DIV x 1/f_ADC12CLK , if ADC12WINC=1 then 15 x ADC12DIV x 1/f_ADC12CLK
(3) 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.
(4) Approximately ten Tau (τ) are needed to get an error of less than ±0.5 LSB: t_sample = ln(2ⁿ⁺²) x (R_S + R_I) x (C_I + C_pext), where n = ADC
resolution = 12, R_S= external source resistance, C_pext = external parasitic capacitance.
54
Specifications
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