MSP430F5338, MSP430F5336, MSP430F5335, MSP430F5333
SLAS721D – AUGUST 2010 – REVISED DECEMBER 2015
www.ti.com
5.41 REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
REFVSEL = {2} for 2.5 V,
REFON = REFOUT = 1 ,
3 V
2.5
±1%
I
VREF+
= 0 A
REFVSEL = {1} for 2 V,
Positive built-in reference
V
REF+
REFON = REFOUT = 1,
3 V
2.0
±1%
V
voltage output
I
VREF+
= 0 A
REFVSEL = {0} for 1.5 V,
REFON = REFOUT = 1,
2.2 V, 3 V
1.5
±1%
I
VREF+
= 0 A
REFVSEL = {0} for 1.5 V
2.2
AVCC minimum voltage,
AV
CC(min)
Positive built-in reference REFVSEL = {1} for 2 V
2.3
V
active
REFVSEL = {2} for 2.5 V
2.8
ADC12SR = 1
(4)
, REFON = 1, REFOUT = 0,
70
100
µA
REFBURST = 0
ADC12SR = 1
(4)
, REFON = 1, REFOUT = 1,
0.45
0.75
mA
REFBURST = 0
Operating supply current
I
REF+
3 V
into AVCC terminal
(2) (3)
ADC12SR = 0
(4)
, REFON = 1, REFOUT = 0,
210
310
µA
REFBURST = 0
ADC12SR = 0
(4)
, REFON = 1, REFOUT = 1,
0.95
1.7
mA
REFBURST = 0
REFVSEL = {0, 1, 2}
Load-current regulation,
I
VREF+
= +10 µA , –1000 µA
I
L(VREF+)
1500
2500 µV/mA
VREF+ terminal
(5)
AV
CC
= AV
CC(min)
for each reference level,
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1
Capacitance at VREF+
REFON = REFOUT = 1,
(6)
C
VREF+
2.2 V, 3 V
20
100
pF
terminal
0 mA
≤
I
VREF+
≤
I
VREF+
(max)
Temperature coefficient
I
VREF+
is a constant in the range
ppm/
TC
REF+
REFOUT = 0
2.2 V, 3 V
20
of built-in reference
(7)
of 0 mA
≤
I
VREF+
≤
–1 mA
°C
Temperature coefficient
I
VREF+
is a constant in the range
ppm/
TC
REF+
REFOUT = 1
2.2 V, 3 V
20
50
of built-in reference
(7)
of 0 mA
≤
I
VREF+
≤
–1 mA
°C
AV
CC
= AV
CC(min)
through AV
CC(max)
,
Power supply rejection
PSRR_DC
T
A
= 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
120
300
µV/V
ratio (DC)
REFOUT = 0 or 1
AV
CC
= AV
CC(min)
through AV
CC(max)
,
Power supply rejection
PSRR_AC
T
A
= 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
1
mV/V
ratio (AC)
REFOUT = 0 or 1
AV
CC
= AV
CC(min)
through AV
CC(max)
,
REFVSEL = {0, 1, 2}, REFOUT = 0,
75
REFON = 0
→
1
Settling time of reference
t
SETTLE
µs
AV
CC
= AV
CC(min)
through AV
CC(max)
,
voltage
(8)
C
VREF
= C
VREF
(max),
75
REFVSEL = {0, 1, 2}, REFOUT = 1,
REFON = 0
→
1
(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 V
REF+
terminal. When REFOUT = 1, the reference is available at the V
REF+
terminal, as well as,
used as the reference for the conversion and uses the larger buffer. When REFOUT = 0, the reference is only used as the reference for
the conversion and uses the smaller buffer.
(2)
The internal reference current is supplied by the AVCC terminal. 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 by terminal AVCC and is equivalent to I
REF+
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)
Connect two decoupling capacitors, 10 µF and 100 nF, 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°C to +85°C) – MIN(–40°C to +85°C)) / MIN(–40°C to +85°C)/(85°C – (–40°C)).
(8)
The condition is that the error in a conversion started after t
REFON
is less than ±0.5 LSB. The settling time depends on the external
capacitive load when REFOUT = 1.
40
Specifications
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