LT1028/LT1128
Ultralow Noise Precision
High Speed Op Amps
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FEATURES
DESCRIPTIO
The LT®1028(gain of –1 stable)/LT1128(gain of +1 stable)
achieveanewstandardofexcellenceinnoiseperformance
with 0.85nV/√Hz 1kHz noise, 1.0nV/√Hz 10Hz noise. This
ultralow noise is combined with excellent high speed
specifications (gain-bandwidth product is 75MHz for
LT1028, 20MHz for LT1128), distortion-free output, and
true precision parameters (0.1µV/°C drift, 10µV offset
voltage, 30 million voltage gain). Although the LT1028/
LT1128 input stage operates at nearly 1mA of collector
current to achieve low voltage noise, input bias current is
only 25nA.
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Voltage Noise
1.1nV/√Hz Max at 1kHz
0.85nV/√Hz Typ at 1kHz
1.0nV/√Hz Typ at 10Hz
35nVP-P Typ, 0.1Hz to 10Hz
Voltage and Current Noise 100% Tested
Gain-Bandwidth Product
LT1028: 50MHz Min
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LT1128: 13MHz Min
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Slew Rate
LT1028: 11V/µs Min
LT1128: 5V/µs Min
The LT1028/LT1128’s voltage noise is less than the noise
of a 50Ω resistor. Therefore, even in very low source
impedance transducer or audio amplifier applications, the
LT1028/LT1128’s contribution to total system noise will
be negligible.
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Offset Voltage: 40µV Max
Drift with Temperature: 0.8µV/°C Max
Voltage Gain: 7 Million Min
Available in 8-Pin SO Package
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, LTC and LT are registered trademarks of Linear Technology Corporation
APPLICATIO S
■
Low Noise Frequency Synthesizers
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High Quality Audio
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Infrared Detectors
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Accelerometer and Gyro Amplifiers
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350Ω Bridge Signal Conditioning
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Magnetic Search Coil Amplifiers
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Hydrophone Amplfiers
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Voltage Noise vs Frequency
TYPICAL APPLICATIO
10
V
S
T
= ±15V
= 25°C
Flux Gate Amplifier
MAXIMUM
A
1/f CORNER = 14Hz
DEMODULATOR
SYNC
TYPICAL
+
1
OUTPUT TO
DEMODULATOR
LT1028
1/f CORNER = 3.5Hz
SQUARE
WAVE
DRIVE
1kHz
–
FLUX GATE
TYPICAL
SCHONSTEDT
#203132
1k
0.1
50Ω
0.1
1
10
1k
100
FREQUENCY (Hz)
1028/1128 TA02
1028/1128 TA01
1