LT1028/LT1128
Ultra Low Noise Precision
High Speed Op Amps
FEATURES
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DESCRIPTIO
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Voltage Noise
1.1nV/鈭欻z Max. at 1kHz
0.85nV/鈭欻z Typ. at 1kHz
1.0nV/鈭欻z Typ. at 10Hz
35nV
P-P
Typ., 0.1Hz to 10Hz
Voltage and Current Noise 100% Tested
Gain-Bandwidth Product
LT1028: 50MHz Min.
LT1128: 13MHz Min.
Slew Rate
LT1028: 11V/碌s Min.
LT1128: 5V/碌s Min.
Offset Voltage: 40碌V Max.
Drift with Temperature: 0.8碌V/擄C Max.
Voltage Gain: 7 Million Min.
Available in 8-Pin SO Package
The LT1028(gain of 鈥? stable)/LT1128(gain of +1 stable)
achieve a new standard of excellence in noise performance
with 0.85nV/鈭欻z 1kHz noise, 1.0nV/鈭欻z 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 (0.1碌V/擄C drift, 10碌V 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.
The LT1028/LT1128鈥檚 voltage noise is less than the noise
of a 50鈩?resistor. Therefore, even in very low source
impedance transducer or audio amplifier applications, the
LT1028/LT1128鈥檚 contribution to total system noise will
be negligible.
APPLICATI
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Low Noise Frequency Synthesizers
High Quality Audio
Infrared Detectors
Accelerometer and Gyro Amplifiers
350鈩?Bridge Signal Conditioning
Magnetic Search Coil Amplifiers
Hydrophone Amplfiers
Flux Gate Amplifier
10
VOLTAGE NOISE DENSITY (nV/鈭欻z)
DEMODULATOR
SYNC
OUTPUT TO
DEMODULATOR
1k
+
LT1028
鈥?/div>
SQUARE
WAVE
DRIVE
1kHz
FLUX GATE
TYPICAL
SCHONSTEDT
#203132
1
1/f CORNER = 3.5Hz
50鈩?/div>
0.1
0.1
1028/1128 TA01
U
Voltage Noise vs Frequency
V
S
= 鹵15V
T
A
= 25擄C
MAXIMUM
1/f CORNER = 14Hz
TYPICAL
1
10
100
FREQUENCY (Hz)
1k
1028/1128 TA02
UO
1
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