LT1028_15 Datasheet, PDF (5/28 Pages) Linear Technology – Ultralow Noise Precision High Speed Op Amps

LT1028/LT1128
Electrical Characteristics The l denotes the specifications which apply over the operating
temperature range –40°C ≤ T_A ≤ 85°C. V_S = ±15V, unless otherwise noted. (Note 11)
LT1028AC
LT1128AC
LT1028C
LT1128C
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX
V_OS
∆V_OS
∆Temp
Input Offset Voltage
Average Input Offset Drift
(Note 8)
l
20
95
35 150
l
0.2 0.8
0.25 1.0
I_OS
Input Offset Current
I_B
Input Bias Current
Input Voltage Range
V_CM = 0V
V_CM = 0V
l
20
80
28 160
l
±35 ±140
±45 ±280
l ±10.4 ±11.8
±10.4 ±11.8
CMRR
PSRR
A_VOL
V_OUT
I_S
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Supply Current
V_CM = ±10.5V
V_S = ±4.5V to ±18V
R_L ≥ 2k, V_O = ±10V
R_L ≥ 1k, V_O = ±10V
R_L ≥ 2k
l 108 123
102 123
l 112 131
106 131
l 4.0 20.0
3.0 14.0
2.5 20.0
2.0 14.0
l ±11.0 ±12.5
±11.0 ±12.5
l
8.5 11.0
8.7 12.5
UNITS
µV
µV/°C
nA
nA
V
dB
dB
V/µV
V/µV
V
mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Input Offset Voltage measurements are performed by automatic
test equipment approximately 0.5 sec. after application of power. In
addition, at T_A = 25°C, offset voltage is measured with the chip heated
to approximately 55°C to account for the chip temperature rise when the
device is fully warmed up.
Note 3: Long Term Input Offset Voltage Stability refers to the average
trend line of Offset Voltage vs Time over extended periods after the first 30
days of operation. Excluding the initial hour of operation, changes in V_OS
during the first 30 days are typically 2.5µV.
Note 4: This parameter is tested on a sample basis only.
Note 5: 10Hz noise voltage density is sample tested on every lot with the
exception of the S8 and S16 packages. Devices 100% tested at 10Hz are
available on request.
Note 6: Current noise is defined and measured with balanced source
resistors. The resultant voltage noise (after subtracting the resistor noise
on an RMS basis) is divided by the sum of the two source resistors to
obtain current noise. Maximum 10Hz current noise can be inferred from
100% testing at 1kHz.
Note 7: Gain-bandwidth product is not tested. It is guaranteed by design
and by inference from the slew rate measurement.
Note 8: This parameter is not 100% tested.
Note 9: The inputs are protected by back-to-back diodes. Current-limiting
resistors are not used in order to achieve low noise. If differential input
voltage exceeds ±1.8V, the input current should be limited to 25mA.
Note 10: This parameter guaranteed by design, fully warmed up at T_A
= 70°C. It includes chip temperature increase due to supply and load
currents.
Note 11: The LT1028/LT1128 are designed, characterized and expected to
meet these extended temperature limits, but are not tested at –40°C and
85°C. Guaranteed I-grade parts are available. Consult factory.
For more information www.linear.com/LT1028
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