LT1113C 查看數據表（PDF） - Linear Technology

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LT1113C

Dual Low Noise, Precision, JFET Input Op Amps

Linear Technology 

LT1113

TYPICAL APPLICATI S

Accelerometer Amplifier with DC Servo

ACCELEROMETER

B & K MODEL 4381

OR EQUIVALENT

R1

100M

C1

1250pF

R2

18k

R3 C2

2k 2µF

6

7

5V TO 15V

2– 8

1/2 LT1113

5

1

1/2 LT1113

3+

4

–5V TO –15V

R4

20M

R5

20M

C3

2µF

R4C2 = R5C3 > R1 (1 + R2/R3) C1

OUTPUT = 0.8mV/pC* = 8.0mV/g**

DC OUTPUT ≤ 2.7mV

OUTPUT NOISE = 6nV/√Hz AT 1kHz

*PICOCOULOMBS

**g = EARTH’S GRAVITATIONAL CONSTANT

OUTPUT

1113 • TA03

Paralleling Amplifiers to Reduce Voltage Noise

3+

A1

1

1k

1/2 LT1113

2–

51Ω

1k

10k

3+

A2

1

1k

1/2 LT1113

2–

51Ω

1k

15V

6– 8

7

1/2 LT1113

5+

4

OUTPUT

15V

–15V

5+ 8

An

7

1k

1/2 LT1113

6–

4

1. ASSUME VOLTAGE NOISE OF LT1113 AND 51Ω SOURCE RESISTOR = 4.6nV/√Hz

51Ω

–15V

1k

2. GAIN WITH n LT1113s IN PARALLEL = n • 200

3. OUTPUT NOISE = √n • 200 • 4.6nV/√Hz

4. INPUT REFERRED NOISE = OUTPUT NOISE = 4.6

n • 200 √n

nV/√Hz

5. NOISE CURRENT AT INPUT INCREASES √n TIMES

6. IF n = 5, GAIN = 1000, BANDWIDTH = 1MHz, RMS NOISE, DC TO 1MHz = 9µV = 4µV

√5

1113 • TA04

13

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