Datasheet

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SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
38
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MSP430x20x2 electrical characteristics over recommended ranges of supply voltage and
operating free-air temperature (unless otherwise noted) (continued)
10-bit ADC, power supply and input range conditions (see Note 1, MSP430x20x2 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
V
CC
Analog supply voltage range V
SS
= 0 V 2.2 3.6 V
V
Ax
Analog input voltage range
(see Note 2)
All Ax terminals.
Analog inputs selected in ADC10AE
register.
0 V
CC
V
I
ADC10
ADC10 supply current
f
ADC10CLK
= 5.0 MHz
ADC10ON = 1, REFON = 0
2.2 V 0.52 1.05
mA
I
ADC10
ADC10 supply current
(see Note 3)
ADC10ON = 1, REFON = 0
ADC10SHT0 = 1, ADC10SHT1 = 0,
ADC10DIV = 0
3 V 0.6 1.2
mA
I
REF+
Reference supply current,
reference buffer disabled
f
ADC10CLK
= 5.0 MH
z
ADC10ON = 0,
REF2_5V=0 2.2 V/3 V
0.25
0.4
mA
I
REF+
reference buffer disabled
(see Note 4)
ADC10ON = 0,
REFON = 1,
REFOUT = 0
REF2_5V=1 3 V
0.25 0.4
mA
I
REFB
Reference buffer supply current
f
ADC10CLK
= 5.0 MH
z
ADC10ON = 0,
REFON = 1,
ADC10SR=0 2.2 V/3 V 1.1 1.4 mA
I
REFB
Reference buffer supply current
(see Note 4)
REFON = 1,
REF2_5V = 0
REFOUT = 1
ADC10SR=1 2.2 V/3 V 0.46 0.55 mA
C
I
Input capacitance
Only one terminal Ax selected at a
time
27 pF
R
I
Input MUX ON resistance 0V ≤ V
Ax
≤ V
CC
2.2 V/3 V 2000 Ω
NOTES: 1. The leakage current is defined in the leakage current table with Px.x/Ax parameter.
2. The analog input voltage range must be within the selected reference voltage range V
R+
to V
R−
for valid conversion results.
3. The internal reference supply current is not included in current consumption parameter I
ADC10
.
4. The internal reference current is supplied via terminal V
CC
. Consumption is independent of the ADC10ON control bit, unless a
conversion is active. The REFON bit enables the built-in reference to settle before starting an A/D conversion.