Datasheet

MSP430x22x2, MSP430x22x4
MIXED SIGNAL MICROCONTROLLER
SLAS504B − JULY 2006 − REVISED JULY 2007
47
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
10-bit ADC, built-in voltage reference
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
P iti b ilt i f
I
VREF+
≤ 1 mA, REF2_5V = 0 2.2
V
CC,REF+
Positive built-in reference
analog supply voltage range
I
VREF+
≤ 0.5 mA, REF2_5V = 1 2.8
V
V
CC
,
REF+
ana
l
og supp
l
y vo
lt
age range
I
VREF+
≤ 1 mA, REF2_5V = 1 2.9
V
V
Positive built-in reference
I
VREF+
≤ I
VREF+
max, REF2_5V = 0 2.2 V/3 V 1.41 1.5 1.59
V
V
REF+
Positive
built in
reference
voltage
I
VREF+
≤ I
VREF+
max, REF2_5V = 1 3 V 2.35 2.5 2.65
V
I
Maximum V
REF+
load
2.2 V ±0.5
mA
I
LD,VREF+
Maximum
V
REF
+
load
current
3 V ±1
mA
V load regulation
I
VREF+
= 500 μA ± 100 μA,
Analog input voltage V
Ax
≈ 0.75 V,
REF2_5V = 0
2.2 V/3 V ±2
LSB
V
REF+
load regulation
I
VREF+
= 500 μA ± 100 μA,
Analog input voltage V
Ax
≈ 1.25 V,
REF2_5V = 1
3 V ±2
LSB
V
REF+
load regulation
I
VREF+
= 100 μA → 900 μA,
V
Ax
≈ 0.5 x V
REF+
,
ADC10SR=0
3V
400
ns
V
REF
+
load
regulation
response time
V
A
x
≈
0
.
5
x
V
REF
+
,
Error of conversion result
≤1 LSB
ADC10SR=1
3 V
2000
ns
C
VREF+
Max. capacitance at pin
V
REF+
(see Note 1)
I
VREF+
≤±1 mA,
REFON = 1, REFOUT = 1
2.2 V/3 V 100 pF
TC
REF+
Temperature coefficient
I
VREF+
= const. with
0 mA ≤ I
VREF+
≤ 1 mA
2.2 V/3 V ±100 ppm/°C
t
REFON
Settling time of internal
reference voltage
(see Note 2)
I
VREF+
= 0.5 mA, REF2_5V = 0,
REFON = 0 → 1
3.6 V 30 μs
I
VREF+
= 0.5 mA,
REF2_5V = 0,
ADC10SR=0
22V
1
t
Settling time of reference
buffer
REF2
_
5V
=
0
,
REFON = 1,
REFBURST = 1
ADC10SR=1
2.2 V
2.5
s
t
REFBURST
buffer
(see Note 2)
I
VREF+
= 0.5 mA,
REF2_5V = 1,
ADC10SR=0
3V
2
μs
REF2
_
5V
=
1
,
REFON = 1,
REFBURST = 1
ADC10SR=1
3 V
4.5
NOTES: 1. The capacitance applied to the internal buffer operational amplifier, if switched to terminal P2.4/TA2/A4/V
REF+
/V
eREF+
(REFOUT=1),
must be limited; the reference buffer may become unstable otherwise.
2. The condition is that the error in a conversion started after t
REFON
or t
RefBuf
is less than ±0.5 LSB.