LT1028CSW datasheet(15/20 Pages) LINER

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LT1028/LT1128

Paralleling Amplifiers to Reduce Voltage Noise

Tape Head Amplifier

1028/1128 TA07

0.1

µF

Ω

–

LT1028

OUTPUT

499

Ω

TAPE HEAD

INPUT

31.6k

ALL RESISTORS METAL FILM

Phono Preamplifier

1028/1128 TA06

0.1

µF

Ω

–15V

10k

–

LT1028

OUTPUT

787

Ω

0.33

µF

100pF

47k

MAG PHONO

INPUT

15V

ALL RESISTORS METAL FILM

Low Noise, Wide Bandwidth Instrumentation Amplifier

Gyro Pick-Off Amplifier

1028/1128 TA08

Ω

–

LT1028

OUTPUT

820

Ω

+INPUT

68pF

10k

Ω

68pF

820

Ω

–

LT1028

–INPUT

–

LT1028

300

Ω

300

Ω

10k

GAIN = 1000, BANDWIDTH = 1MHz

INPUT REFERRED NOISE = 1.5nV/

√Hz AT 1kHz

WIDEBAND NOISE –DC to 1MHz = 3

µVRMS

IF BW LIMITED TO DC TO 100kHz = 0.55

µVRMS

1028/1128 TA09

100

Ω

OUTPUT TO SYNC

DEMODULATOR

–

LT1028

SINE

DRIVE

•

GYRO TYPICAL–

NORTHROP CORP.

GR-F5AH7-5B

1028/1128 TA03

–

1.5k

LT1028

470

Ω

OUTPUT

–

7.5

Ω

4.7k

–

1.5k

470

Ω

7.5

Ω

–

1.5k

470

Ω

7.5

Ω

LT1028

OUTPUT NOISE

× 200

µV

√5

1. ASSUME VOLTAGE NOISE OF LT1028 AND 7.5

Ω SOURCE RESISTOR = 0.9nV/√Hz.

2. GAIN WITH n LT1028s IN PARALLEL = n

× 200.

3. OUTPUT NOISE =

√n × 200 × 0.9nV/√Hz.

4. INPUT REFERRED NOISE =

nV/

√Hz.

5. NOISE CURRENT AT INPUT INCREASES

√n TIMES.

6. IF n = 5, GAIN = 1000, BANDWIDTH = 1MHz, RMS NOISE, DC TO 1MHz =

= 0.9

µV.

0.9

√n

TYPICAL APPLICATIO S

LT1028CSW Datasheet(PDF) 15 Page - Linear Technology

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