MSP430FR5729 Datasheet, PDF (33/115 Pages) Texas Instruments – MSP430FR572x Mixed-Signal Microcontrollers

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MSP430FR5729, MSP430FR5728, MSP430FR5727, MSP430FR5726, MSP430FR5725
MSP430FR5724, MSP430FR5723, MSP430FR5722, MSP430FR5721, MSP430FR5720
SLASE35A – MAY 2014 – REVISED JUNE 2014
5.31 REF, External Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) ⁽¹⁾
PARAMETER
V_eREF+
Positive external reference voltage input
V_eREF–
Negative external reference voltage input
(V_eREF+ –
V_REF–/V_eREF–)
Differential external reference voltage input
I_VeREF+,
I_VeREF–
Static input current
TEST CONDITIONS
V_eREF+ > V_eREF– ⁽²⁾
V_eREF+ > V_eREF– ⁽³⁾
V_eREF+ > V_eREF– ⁽⁴⁾
1.4 V ≤ V_eREF+ ≤ V_AVCC,
V_eREF– = 0 V,
f_ADC10CLK = 5 MHz,
ADC10SHTx = 1h,
Conversion rate 200 ksps
1.4 V ≤ V_eREF+ ≤ V_AVCC,
V_eREF– = 0 V,
f_ADC10CLK = 5 MHz,
ADC10SHTx = 8h,
Conversion rate 20 ksps
V_CC
MIN TYP MAX UNIT
1.4
AV_CC V
0
1.2 V
1.4
AV_CC V
2.2 V, 3 V
-6
6 µA
2.2 V, 3 V
-1
1 µA
C_VREF+,
C_VREF-
Capacitance at VREF+ or VREF- terminal⁽⁵⁾
10
µF
(1) The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, C_i, is also
the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the
recommendations on analog-source impedance to allow the charge to settle for 10-bit accuracy.
(2) The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
accuracy requirements.
(3) The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced
accuracy requirements.
(4) The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
(5) Two decoupling capacitors, 10 µF and 100 nF, should be connected to VREF to decouple the dynamic current required for an external
reference source if it is used for the ADC10_B. Also see the MSP430FR57xx Family User's Guide (SLAU272).
5.32 REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V_REF+
PARAMETER
Positive built-in reference
voltage output
TEST CONDITIONS
REFVSEL = {2} for 2.5 V, REFON = 1
REFVSEL = {1} for 2 V, REFON = 1
REFVSEL = {0} for 1.5 V, REFON = 1
V_CC
MIN TYP MAX UNIT
3V
2.4 2.5 2.6
3V
1.92 2.0 2.08 V
3V
1.44 1.5 1.56
AV_CC(min)
AVCC minimum voltage,
Positive built-in reference
active
REFVSEL = {0} for 1.5 V
REFVSEL = {1} for 2 V
REFVSEL = {2} for 2.5 V
2.0
2.2
V
2.7
I_REF+
Operating supply current into f_ADC10CLK = 5 MHz,
AVCC terminal ⁽¹⁾
REFON = 1, REFBURST = 0
3V
33
45 µA
T_REF+
Temperature coefficient of
built-in reference
REFVSEL = (0, 1, 2}, REFON = 1
±35
ppm/
°C
AV_CC = AV_{CC (min)} - AV_CC(max),
T_A = 25°C, REFON = 1,
REFVSEL = (0} for 1.5 V
1600
PSRR_DC
Power supply rejection ratio
(DC)
AV_CC = AV_{CC (min)} - AV_CC(max),
T_A = 25°C, REFON = 1,
REFVSEL = (1} for 2 V
1900
µV/V
AV_CC = AV_{CC (min)} - AV_CC(max),
T_A = 25°C, REFON = 1,
REFVSEL = (2} for 2.5 V
3600
t_SETTLE
Settling time of reference
voltage ⁽²⁾
AV_CC = AV_{CC (min)} - AV_CC(max),
REFVSEL = (0, 1, 2}, REFON = 0 → 1
30
µs
(1) The internal reference current is supplied by terminal AVCC. Consumption is independent of the ADC10ON control bit, unless a
conversion is active. The REFON bit enables to settle the built-in reference before starting an A/D conversion.
(2) The condition is that the error in a conversion started after t_REFON is less than ±0.5 LSB.
Copyright © 2014, Texas Instruments Incorporated
Specifications
33
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