LT1028/LT1128
Ultra Low Noise Precision
High Speed Op Amps
U
DESCRIPTIO
EATURE
Voltage Noise
S
F
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The LT1028(gain of –1 stable)/LT1128(gain of +1 stable)
achieveanewstandardofexcellenceinnoiseperformance
with 0.85nV/√Hz 1kHz noise, 1.0nV/√Hz 10Hz noise. This
ultra low 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.
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
O U
PPLICATI
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Low Noise Frequency Synthesizers
High Quality Audio
Infrared Detectors
Accelerometer and Gyro Amplifiers
350Ω Bridge Signal Conditioning
Magnetic Search Coil Amplifiers
Hydrophone Amplfiers
Flux Gate Amplifier
Voltage Noise vs Frequency
10
V
T
= ±15V
= 25°C
S
A
DEMODULATOR
SYNC
MAXIMUM
+
1/f CORNER = 14Hz
OUTPUT TO
DEMODULATOR
LT1028
TYPICAL
–
1k
1
SQUARE
WAVE
DRIVE
1kHz
FLUX GATE
TYPICAL
SCHONSTEDT
#203132
1/f CORNER = 3.5Hz
50Ω
0.1
0.1
1
10
1k
100
1028/1128 TA01
FREQUENCY (Hz)
1028/1128 TA02
1