Datasheet

MSP430F5438, MSP430F5437, MSP430F5436, MSP430F5435
MSP430F5419, MSP430F5418
www.ti.com SLAS612D –AUGUST 2009–REVISED AUGUST 2013
12-Bit ADC, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
REF2_5V = 1 for 2.5 V,
3 V 2.35 2.45 2.53
I
VREF+
(max) ≤ I
VREF+
≤ I
VREF+
(min)
Positive built-in reference
V
REF+
V
voltage output
REF2_5V = 0 for 1.5 V,
2.2 V, 3 V 1.41 1.47 1.53
I
VREF+
(max) ≤ I
VREF+
≤ I
VREF+
(min)
AV
CC
minimum voltage, REF2_5V = 0 2.2
AV
CC(min)
Positive built-in reference V
REF2_5V = 1 2.8
active
2.2 V –1
Load current out of VREF+
I
VREF+
mA
terminal
3 V –1
2.2 V ±2
I
VREF+
= +10 µA/–1000 µA,
Analog input voltage ~0.75 V, REF2_5V = 0
Load-current regulation, 3 V ±2
I
L(VREF)+
LSB
VREF+ terminal
I
VREF+
= +10 µA/–1000 µA,
3 V ±2
Analog input voltage ~1.25 V, REF2_5V = 1
Capacitance at VREF+
C
VREF+
REFON = REFOUT = 1
(1)
2.2 V, 3 V 20 100 pF
terminal
REF2_5V = 0,
I
VREF+
is a constant in the range of 2.2 V, 3 V 30
0 mA ≤ I
VREF+
≤ –1 mA
Temperature coefficient of ppm/
T
REF+
built-in reference
(2)
°C
REF2_5V = 1,
I
VREF+
is a constant in the range of 3 V 30
0 mA ≤ I
VREF+
≤ –1 mA
V
REF+
= 1.5 V, V
AVCC
= 2.2 V,
20
REFOUT = 0, REFON = 0 → 1
V
REF+
= 2.5 V, V
AVCC
= 2.8 V,
20
REFOUT = 0, REFON = 0 → 1
Settling time of reference
V
REF+
= 1.5 V, V
AVCC
= 2.2 V,
t
SETTLE
µs
voltage
(3)
C
VREF
= C
VREF
(max), 35
REFOUT = 1, REFON = 0 → 1
V
REF+
= 2.5 V, V
AVCC
= 2.8 V,
C
VREF
= C
VREF
(max), 35
REFOUT = 1, REFON = 0 → 1
(1) 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).
(2) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C))
(3) 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.
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