Datasheet

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SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005
www.ti.com
3
ELECTRICAL CHARACTERISTICS
At T
A
= +25°C, V
S
= ±15V, R
L
= 10kΩ, unless otherwise noted.
INA128P, U
INA129P. U
INA128PA, UA
INA129PA, UA
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
INPUT
Offset Voltage, RTI
Initial T
A
= +25°C ±10±100/G ±50±500/G ±25±100/G ±125±1000/G µV
vs Temperature T
A
= T
MIN
to T
MAX
±0.2±2/G ±0.5±20/G ±0.2±5/G ±1±20/G µV/°C
vs Power Supply V
S
= ±2.25V to ±18V ±0.2±20/G ±1±100/G ∗ ±2±200/G µV/V
Long-Term Stability ±0.1±3/G ∗ µV/mo
Impedance, Differential 10
10
|| 2 ∗ Ω || pF
Common-Mode 10
11
|| 9 ∗ Ω || pF
Common-Mode Voltage Range
(1)
V
O
= 0V (V+) − 2 (V+) − 1.4 ∗ ∗ V
(V−) + 2 (V−) + 1.7 ∗ ∗ V
Safe Input Voltage ±40 ∗ V
Common-Mode Rejection V
CM
= ±13V, ∆R
S
= 1kΩ
G = 1 80 86 73 ∗ dB
G = 10 100 106 93 ∗ dB
G = 100 120 125 110 ∗ dB
G = 1000 120 130 110 ∗ dB
BIAS CURRENT ±2 ±5 ∗ ±10 nA
vs Temperature ±30 ∗ pA/°C
Offset Current ±1 ±5 ∗ ±10 nA
vs Temperature ±30 ∗ pA/°C
NOISE VOLTAGE, RTI G = 1000, R
S
= 0Ω
f = 10Hz 10 ∗ nV/√Hz
f = 100Hz 8 ∗ nV/√Hz
f = 1kHz 8 ∗ nV/√Hz
f
B
= 0.1Hz to 10Hz 0.2 ∗ µV
PP
Noise Current
f = 10Hz 0.9 ∗ pA/√Hz
f = 1kHz 0.3 ∗ pA/√Hz
f
B
= 0.1Hz to 10Hz 30 ∗ pA
PP
GAIN
Gain Equation, INA128 1 + (50kΩ/R
G
) ∗ V/V
Gain Equation, INA129 1 + (49.4kΩ/R
G
) ∗ V/V
Range of Gain 1 10000 ∗ ∗ V/V
Gain Error G = 1 ±0.01 ±0.024 ∗ ±0.1 %
G = 10 ±0.02 ±0.4 ∗ ±0.5 %
G = 100 ±0.05 ±0.5 ∗ ±0.7 %
G = 1000 ±0.5 ±1 ∗ ±2 %
Gain vs Temperature
(2)
G = 1 ±1 ±10 ∗ ∗ ppm/°C
50kΩ (or 49.4kΩ) Resistance
(2)(3)
±25 ±100 ∗ ∗ ppm/°C
Nonlinearity V
O
= ±13.6V, G = 1 ±0.0001 ±0.001 ∗ ±0.002 % of FSR
G = 10 ±0.0003 ±0.002 ∗ ±0.004 % of FSR
G = 100 ±0.0005 ±0.002 ∗ ±0.004 % of FSR
G = 1000 ±0.001
(4)
∗ ∗ % of FSR
NOTE
:
∗ Specification is same as INA128P, U or INA129P, U.
(1)
Input common-mode range varies with output voltage — see typical curves.
(2)
Specified by wafer test.
(3)
Temperature coefficient of the 50kΩ (or 49.4kΩ) term in the gain equation.
(4)
Nonlinearity measurements in G = 1000 are dominated by noise. Typical nonlinearity is ±0.001%.