1

LT1028/LT1128

FEATURES

DESCRIPTIO

APPLICATIO S

s

Voltage Noise

1.1nV/

√Hz Max at 1kHz

0.85nV/

√Hz Typ at 1kHz

1.0nV/

√Hz Typ at 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: 40

µV Max

s

Drift with Temperature: 0.8

µV/°C Max

s

Voltage Gain: 7 Million Min

s

Available in 8-Pin SO Package

The LT

achieve a new standard of excellence in noise performance

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 (0.1

µV/°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 50

Ω 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.

Ultralow Noise Precision

High Speed Op Amps

Flux Gate Amplifier

Voltage Noise vs Frequency

–

+

DEMODULATOR

SYNC

OUTPUT TO

DEMODULATOR

LT1028

1k

50

Ω

SQUARE

WAVE

DRIVE

1kHz

FLUX GATE

TYPICAL

SCHONSTEDT

#203132

1028/1128 TA01

FREQUENCY (Hz)

1

0.1

1

10

10

100

1028/1128 TA02

0.1

1k

1/f CORNER = 3.5Hz

1/f CORNER = 14Hz

TYPICAL

MAXIMUM

s

Low Noise Frequency Synthesizers

s

High Quality Audio

s

Infrared Detectors

s

Accelerometer and Gyro Amplifiers

s

350

Ω Bridge Signal Conditioning

s

Magnetic Search Coil Amplifiers

s

Hydrophone Amplfiers

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation