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LT1115

Ultralow Noise, Low Distortion, Audio Op Amp

Linear Technology 

LT1115

Ultralow Noise,

Low Distortion, Audio Op Amp

FEATURES

■ Voltage Noise: 1.2nV/√Hz Max at 1kHz

0.9nV/√Hz Typ at 1kHz

■ Voltage and Current Noise 100% Tested

■ Gain-Bandwidth Product: 40MHz Min

■ Slew Rate: 10V/µs Min

■ Voltage Gain: 2 Million Min

■ Low THD at 10kHz, AV = –10, RL = 600Ω: 0.002%

VO = 7VRMS

■ Low IMD, CCIF Method, AV = +10: 0.002%

RL = 600Ω

VO = 7VRMS

U

APPLICATIO S

■ High Quality Audio Preamplifiers

■ Low Noise Microphone Preamplifiers

■ Very Low Noise Instrumentation Amplifiers

■ Low Noise Frequency Synthesizers

■ Infrared Detector Amplifiers

■ Hydrophone Amplifiers

■ Low Distortion Oscillators

DESCRIPTIO

The LT®1115 is the lowest noise audio operational ampli-

fier available. This ultralow noise performance (0.9nV/√Hz

at 1kHz) is combined with high slew rates (>15V/µs) and

very low distortion specifications.

The RIAA circuit shown below using the LT1115 has very

low distortion and little deviation from ideal RIAA

response (see graph).

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

INPUT

RIN 47.5k (MM)

100Ω (MC)

COM

RIAA Phonograph Preamplifier (40/60db Gain)

CIN

(SELECT

PER

PHOTO

CART-

RIDGE)

18V

18V

+ 1µF 1µF +

3+

7

35V 35V

2

A1

6

100Ω 1 A2

LT1115

2–

4

2N4304*

~250Ω

LT1010CT

3

2mA SELECT

FOR 2mA

1µF

1µF

–18V

35V

35V

–18V

RBOOST

49.9Ω

4

5

562Ω

RL

25k

OUTPUT

3900pF

V+

+

COM

+

V–

18V

470µF

35V

470µF

35V

–18V

499Ω

17.8k

210k

22.6Ω

330pF

210Ω

SINGLE

POINT

BOARD

+

GROUND

2200µF

16V

OPEN—MM

CLOSED—MC 3900pF

82.5k

15nF

RESISTORS 1%

*OR USE 2mA CURRENT SOURCE

MM = MOVING MAGNET

MC = MOVING COIL

4.7µF

FILM

NOTE: BYPASS SUPPLIES WITH LOW ESR CAPS

OTHER CAPS: HIGH QUALITY FILM

LT1115 • TA01

Measured Deviation from RIAA

Response. lnput at 1kHz = 1mVRMS

Pre-Emphasized

1.0000

0.80000

0.60000

VS = ± 18V

RS = 25Ω

TA = 25°C

0.40000

0.20000

0.0

MEASURED

–0.2000

–0.4000

–0.6000

–0.8000

–1.000

20

COMPUTER

SIMULATED

100

1k

FREQUENCY (Hz)

10k 50k

LT1115 • TA02

1115fa

1

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