Datasheet

INA270
INA271
www.ti.com SBOS381C –FEBRUARY 2007–REVISED MAY 2010
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range: T
A
= –40°C to +125°C.
At T
A
= +25°C, V
S
= +5V, V
CM
= +12V, V
SENSE
= 100mV, and PRE OUT connected to BUF IN, unless otherwise noted.
INA270, INA271
PARAMETER CONDITIONS MIN TYP MAX UNIT
INPUT
Full-Scale Input Voltage V
SENSE
V
SENSE
= (V
IN+
) + (V
IN–
) 0.15 (V
S
– 0.2)/Gain V
Common-Mode Input Range V
CM
–16 +80 V
Common-Mode Rejection Ratio CMRR V
IN+
= –16V to +80V 80 120 dB
Over Temperature V
IN+
= +12V to +80V 100 120 dB
Offset Voltage, RTI
(1)
V
OS
±0.5 2.5 mV
Over Temperature ±3 mV
vs Temperature dV
OS
/dT 2.5 20 mV/°C
vs Power-Supply PSR V
S
= +2.7V to +18V, V
CM
= +18V 5 100 mV/V
Input Bias Current, V
IN–
Pin I
B
±8 ±16 mA
PRE OUT Output Impedance
(2)
96 kΩ
Buffer Input Bias Current –50 nA
Buffer Input Bias Current Temperature Coefficient ±0.03 nA/°C
OUTPUT (V
SENSE
≥ 20mV)
(3)
Gain: INA270 Total Gain G 14 V/V
Gain: INA271 Total Gain G 20 V/V
Output Buffer Gain G
BUF
2 V/V
Total Gain Error V
SENSE
= 20mV to 100mV ±0.2 ±1 %
Over Temperature ±2 %
vs Temperature 50 ppm/°C
Total Output Error
(4)
±0.75 ±2.2 %
Total Output Error ±1.0 ±3.0 %
Nonlinearity Error V
SENSE
= 20mV to 100mV ±0.002 %
Output Impedance, Pin 5 R
O
1.5 Ω
Maximum Capacitive Load No Sustained Oscillation 10 nF
VOLTAGE OUTPUT
(5)
R
L
= 10kΩ to GND
Swing to V+ Power-Supply Rail (V+) – 0.05 (V+) – 0.2 V
Swing to GND
(6)
V
GND
+ 0.003 V
GND
+ 0.05 V
FREQUENCY RESPONSE
Bandwidth BW C
LOAD
= 5pF 130 kHz
Phase Margin C
LOAD
< 10nF 40 degrees
Slew Rate SR 1 V/ms
Settling Time (1%) t
S
V
SENSE
= 10mV to 100mV
PP
, 2 ms
C
LOAD
= 5pF
(1) RTI means Referred-to-Input.
(2) Initial resistor variation is ±30% with an additional –2200ppm/°C temperature coefficient.
(3) For output behavior when V
SENSE
< 20mV, see the Application Information section Accuracy Variations as A Result of V
SENSE
and
Common-Mode Voltage.
(4) Total output error includes effects of gain error and V
OS
.
(5) See typical characteristic curve Output Swing vs Output Current and Application Information section Accuracy Variations as A Result of
V
SENSE
and Common-Mode Voltage.
(6) Ensured by design; not production tested.
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