Datasheet

INA270-Q1, INA271-Q1
www.ti.com SBOS401B –JULY 2007–REVISED FEBRUARY 2010
RECOMMENDED OPERATING CONDITIONS
MIN MAX UNIT
V
S
Supply voltage 2.7 18 V
T
A
Operating free-air temperature –40 125 °C
ELECTRICAL CHARACTERISTICS
V
S
= 5 V, V
CM
= 12 V, V
SENSE
= 100 mV, PRE OUT connected to BUF IN (unless otherwise noted)
PARAMETER TEST CONDITIONS T
A
(1)
MIN TYP MAX UNIT
Input
(V
S
– 0.2)/
V
SENSE
Full-scale input voltage V
SENSE
= V
IN+
+ V
IN–
25°C 0.15 V
Gain
V
CM
Common-mode input voltage Full range –16 80 V
V
IN+
= –16 V to 80 V 25°C 80 120
CMRR Common-mode rejection dB
V
IN+
= 12 V to 80 V Full range 100 120
25°C ±0.5 2.5
V
OS
Offset voltage, RTI
(2)
mV
Full range ±3
Input offset voltage
ΔV
OS
/ΔT Full range 2.5 20 mV/°C
temperature coefficient
Offset voltage power-supply
PSR V
S
= 2.7 V to 18 V, V
CM
= 18 V Full range 5 100 mV/V
rejection
I
IB
Input bias current IN– pin Full range ±8 ±16 mA
Z
O
Output impedance
(3)
PRE OUT pin 25°C 96 kΩ
Buffer input bias current 25°C –50 nA
Buffer input bias current
25°C ±0.3 nA/°C
temperature coefficient
Output (V
SENSE
≥ 20 mV)
(4)
INA270 14
G Gain 25°C V/V
INA271 20
G
BUF
Output buffer gain 25°C 2 V/V
25°C ±0.2 ±1
Total gain error V
SENSE
= 20 mV to 100 mV %
Full range ±2
Total gain error
Full range 50 ppm/°C
temperature coefficient
25°C ±0.75 ±2.2
Total output error
(5)
%
Full range ±1 ±3
Nonlinearity error V
SENSE
= 20 mV to 100 mV 25°C ±0.002 %
Z
O
Output impedance OUT pin 25°C 1.5 Ω
Maximum capacitive load No sustained oscillation 25°C 10 nF
Voltage Output
(6)
Swing to V+ power-supply rail R
L
= 10 kΩ to GND Full range V+ – 0.05 V+ – 0.2 V
V
GND
+ V
GND
+
Swing to GND R
L
= 10 kΩ to GND Full range V
0.003 0.05
(1) Full range is –40°C to 125°C.
(2) RTI = referred to input
(3) Initial resistor variation is ±30% with an additional –2200-ppm/°C temperature coefficient.
(4) For output behavior when V
SENSE
< 20 mV, see Application Information
(5) Total output error includes effects of gain error and V
OS
.
(6) See Typical Characteristics curve Output Swing vs Output Current and Accuracy Variations as a Result of VSENSE and Common-Mode
Voltage in the Application Information section.
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