LT1028 Datasheet, PDF (1/20 Pages) Linear Technology – Ultra Low Noise Precision High Speed Op Amps

FEATURES
s _{Voltage Noise}
1.1nV/√Hz Max. at 1kHz
0.85nV/√Hz Typ. at 1kHz
1.0nV/√Hz Typ. at 10Hz
35nV_P-P Typ., 0.1Hz to 10Hz
s _{Voltage and Current Noise 100% Tested}
s _{Gain-Bandwidth Product}
LT1028: 50MHz Min.
LT1128: 13MHz Min.
s _{Slew Rate}
LT1028: 11V/µs Min.
LT1128: 5V/µs Min.
s _{Offset Voltage: 40µV Max.}
s _{Drift with Temperature: 0.8µV/°C Max.}
s _{Voltage Gain: 7 Million Min.}
s _{Available in 8-Pin SO Package}
APPLICATI S
s _{Low Noise Frequency Synthesizers}
s _{High Quality Audio}
s _{Infrared Detectors}
s _{Accelerometer and Gyro Amplifiers}
s _{350Ω Bridge Signal Conditioning}
s _{Magnetic Search Coil Amplifiers}
s _{Hydrophone Amplfiers}
LT1028/LT1128
Ultra Low Noise Precision
High Speed Op Amps
DESCRIPTIO
The LT1028(gain of –1 stable)/LT1128(gain of +1 stable)
achieve a new standard of excellence in noise performance
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.
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.
Flux Gate Amplifier
SQUARE
WAVE
DRIVE
1kHz
FLUX GATE
TYPICAL
SCHONSTEDT
#203132
+
LT1028
–
DEMODULATOR
SYNC
OUTPUT TO
DEMODULATOR
1k
50Ω
1028/1128 TA01
Voltage Noise vs Frequency
10
V_S = ±15V
MAXIMUM
T_A = 25°C
1/f CORNER = 14Hz
TYPICAL
1
1/f CORNER = 3.5Hz
0.1
0.1
1
10
100
1k
FREQUENCY (Hz)
1028/1128 TA02
1