MSP430FR5972 Datasheet, PDF (48/142 Pages) Texas Instruments – Mixed‑Signal Microcontrollers

MSP430FR5972, MSP430FR59721, MSP430FR5970, MSP430FR5922, MSP430FR59221
MSP430FR5872, MSP430FR58721, MSP430FR5870
SLASE66A – APRIL 2015 – REVISED MAY 2015
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5.12.8 ADC12
Table 5-22. 12-Bit ADC, Power Supply and Input Range Conditions
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V(Ax)
PARAMETER
Analog input voltage⁽¹⁾
TEST CONDITIONS
All ADC12 analog input pins Ax
V_CC
MIN NOM MAX UNIT
0
AVCC V
I(ADC12_B)
single-
ended mode
Operating supply current into
AVCC plus DVCC terminal^{(2) (3)}
f_ADC12CLK = MODCLK, ADC12ON = 1,
ADC12PWRMD = 0, ADC12DIF = 0
REFON = 0, ADC12SHTx = 0,
ADC12DIV = 0
3.0 V
2.2 V
145 199
µA
140 190
I(ADC12_B)
differential
mode
Operating supply current into
AVCC and DVCC terminals^{(2) (3)}
f_ADC12CLK = MODCLK, ADC12ON = 1,
ADC12PWRMD = 0, ADC12DIF = 1
REFON = 0, ADC12SHTx = 0,
ADC12DIV = 0
3.0 V
2.2 V
175 245
µA
170 230
C_I
Input capacitance
Only one terminal Ax can be selected
at one time
2.2 V
10
15 pF
R_I
Input MUX ON resistance
0 V ≤ V(Ax) ≤ AVCC
>2V
0.5
4
kΩ
<2V
1
10
(1) The analog input voltage range must be within the selected reference voltage range V_R+ to V_R- for valid conversion results.
(2) The internal reference supply current is not included in current consumption parameter I(ADC12_B).
(3) Typically about 60% of the total current into the AVCC and DVCC terminal is from AVCC.
Table 5-23. 12-Bit ADC, Timing Parameters
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
f_ADC12CLK
Specified
performance
TEST CONDITIONS
For specified performance of ADC12 linearity parameters
with ADC12PWRMD = 0.
If ADC12PWRMD = 1, the maximum is 1/4 of the value
shown here.
V_CC
MIN TYP MAX UNIT
0.45
5.4 MHz
f_ADC12CLK
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
External f_ADC12CLK from ACLK, MCLK, or SMCLK,
ADC12SSEL ≠ 0
2.6
3.5
µs
(2)
t_ADC12ON
Turn on settling
time of the ADC
See ⁽³⁾
100 ns
Time ADC must
t_ADC12OFF
be off before
can be turned
t_ADC12OFF must be met to make sure t_ADC12ON time holds
100
ns
on again
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 × ADC12DIV × 1/f_ADC12CLK. If ADC12WINC = 1, then 15 × ADC12DIV × 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 signals 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) × (R_S + R_I) × (C_I + C_pext), where n = ADC
resolution = 12, R_S= external source resistance, C_pext = external parasitic capacitance.
48
Specifications
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MSP430FR5872 MSP430FR58721 MSP430FR5870