Datasheet

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SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
43
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MSP430x20x3 electrical characteristics over recommended ranges of supply voltage and
operating free-air temperature (unless otherwise noted)
SD16_A, power supply and recommended operating conditions (MSP430x20x3 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
AV
CC
Analog supply voltage range
AV
CC
= DV
CC
= V
CC
AV
SS
= DV
SS
= V
SS
= 0V
2.5 3.6 V
SD16LP = 0,
GAIN: 1,2 3 V 730 1050
SD16LP = 0,
f
SD16
= 1 MHz,
SD16OSR = 256
GAIN: 4,8,16 3 V 810 1150
I
SD16
Analog supply current
including internal reference
f
SD16
= 1 MHz,
SD16OSR = 256
GAIN: 32 3 V 1160 1700
µA
I
SD16
Analog supply current
including internal reference
SD16LP = 1,
f
SD16
= 0.5 MHz,
GAIN: 1 3 V 720 1030
µ
A
f
SD16
= 0.5 MHz,
SD16OSR = 256
GAIN: 32 3 V 810 1150
f
SD16
SD16 input clock frequency
SD16LP = 0
(Low power mode disabled)
3 V 0.03 1 1.1
MHz
f
SD16
SD16 input clock frequency
SD16LP = 1
(Low power mode enabled)
3 V 0.03 0.5
MHz
SD16_A, input range (MSP430x20x3 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
V
ID,FSR
Differential full scale input voltage
Bipolar Mode, SD16UNI = 0
−(V
REF
/2)/
GAIN
+(V
REF
/2)/
GAIN
mV
V
ID,FSR
Differential full scale input voltage
range (see Note 1)
Unipolar Mode, SD16UNI = 1
0
+(V
REF
/2)/
GAIN
mV
SD16GAINx=1 ±500
Differential input voltage range
SD16GAINx=2 ±250
V
ID
Differential input voltage range
for specified performance
SD16REFON=1
SD16GAINx=4 ±125
mV
V
ID
for specified performance
(see Note 1)
SD16REFON=1
SD16GAINx=8 ±62
mV
(see Note 1)
SD16GAINx=16 ±31
SD16GAINx=32 ±15
Z
I
Input impedance
f
SD16
= 1MHz
SD16GAINx=1 3 V 200
kΩ
Z
I
Input impedance
(one input pin to AV
SS
)
f
SD16
= 1MHz
SD16GAINx=32 3 V 75
kΩ
Z
ID
Differential Input impedance
f
SD16
= 1MHz
SD16GAINx=1 3 V 300 400
kΩ
Z
ID
Differential Input impedance
(IN+ to IN−)
f
SD16
= 1MHz
SD16GAINx=32 3 V 100 150
kΩ
V
I
Absolute input voltage range
AV
SS
-0.1V
AV
CC
V
V
IC
Common-mode input voltage
range
AV
SS
-0.1V
AV
CC
V
NOTES: 1. The analog input range depends on the reference voltage applied to V
REF
. If V
REF
is sourced externally, the full-scale range
is defined by V
FSR+
= +(V
REF
/2)/GAIN and V
FSR−
= −(V
REF
/2)/GAIN. The analog input range should not exceed 80% of
V
FSR+
or V
FSR−
.