MSP430F663x
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SLAS566C –JUNE 2010–REVISED AUGUST 2012
REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)(1)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX UNIT
REFVSEL = {2} for 2.5 V,
REFON = REFOUT = 1 ,
IVREF+ = 0 A
3 V
2.5
±1%
REFVSEL = {1} for 2 V,
REFON = REFOUT = 1,
IVREF+ = 0 A
Positive built-in reference
voltage output
VREF+
3 V
2.0
1.5
±1%
±1%
V
REFVSEL = {0} for 1.5 V,
REFON = REFOUT = 1,
IVREF+ = 0 A
2.2 V, 3 V
REFVSEL = {0} for 1.5 V
2.2
2.3
2.8
AVCC minimum voltage,
AVCC(min)
Positive built-in reference REFVSEL = {1} for 2 V
V
active
REFVSEL = {2} for 2.5 V
ADC12SR = 1(4), REFON = 1, REFOUT = 0,
REFBURST = 0
ADC12SR = 1(4), REFON = 1, REFOUT = 1,
REFBURST = 0
ADC12SR = 0(4), REFON = 1, REFOUT = 0,
REFBURST = 0
3 V
3 V
3 V
3 V
70
0.45
210
100
0.75
310
1.7
µA
mA
µA
Operating supply current
into AVCC terminal
IREF+
(2) (3)
ADC12SR = 0(4), REFON = 1, REFOUT = 1,
REFBURST = 0
0.95
mA
REFVSEL = {0, 1, 2}
Load-current regulation, IVREF+ = +10 µA / -1000 µA
IL(VREF+)
1500
2500 µV/mA
VREF+ terminal(5)
AVCC = AVCC(min) for each reference level,
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1
(6)
Capacitance at VREF+
terminal
REFON = REFOUT = 1,
CVREF+
TCREF+
TCREF+
2.2 V, 3 V
2.2 V, 3 V
2.2 V, 3 V
20
100
50
pF
0 mA ≤ IVREF+ ≤ IVREF+(max)
Temperature coefficient
of built-in reference(7)
IVREF+ is a constant in the range
REFOUT = 0
ppm/
°C
20
20
of 0 mA ≤ IVREF+ ≤ –1 mA
Temperature coefficient
of built-in reference(7)
IVREF+ is a constant in the range
REFOUT = 1
ppm/
°C
of 0 mA ≤ IVREF+ ≤ –1 mA
AVCC = AVCC(min) - AVCC(max)
TA = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
REFOUT = 0 or 1
,
Power supply rejection
ratio (dc)
PSRR_DC
PSRR_AC
120
1
300 µV/V
mV/V
AVCC = AVCC(min) - AVCC(max)
TA = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
REFOUT = 0 or 1
,
Power supply rejection
ratio (ac)
(1) The reference is supplied to the ADC by the REF module and is buffered locally inside the ADC. The ADC uses two internal buffers, one
smaller and one larger for driving the VREF+ terminal. When REFOUT = 1, the reference is available at the VREF+ terminal, as well as,
used as the reference for the conversion and utilizes the larger buffer. When REFOUT = 0, the reference is only used as the reference
for the conversion and utilizes the smaller buffer.
(2) The internal reference current is supplied via terminal AVCC. Consumption is independent of the ADC12ON control bit, unless a
conversion is active. REFOUT = 0 represents the current contribution of the smaller buffer. REFOUT = 1 represents the current
contribution of the larger buffer without external load.
(3) The temperature sensor is provided by the REF module. Its current is supplied via terminal AVCC and is equivalent to IREF+ with
REFON = 1 and REFOUT = 0.
(4) For devices without the ADC12, the parametric with ADC12SR = 0 are applicable.
(5) Contribution only due to the reference and buffer including package. This does not include resistance due to PCB traces or other
external factors.
(6) 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 ADC12_A. See also the MSP430x5xx and MSP430x6xx Family User's Guide (SLAU208).
(7) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C)).
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