|
LT1115_1 Datasheet, PDF (1/16 Pages) Linear Integrated Systems – Ultralow Noise, Low Distortion, Audio Op Amp | |||
|
LT1115
Ultralow Noise,
Low Distortion, Audio Op Amp
FEATURES
â Voltage Noise: 1.2nV/âHz Max at 1kHz
0.9nV/âHz Typ at 1kHz
â Voltage and Current Noise 100% Tested
â Gain-Bandwidth Product: 40MHz Min
â Slew Rate: 10V/µs Min
â Voltage Gain: 2 Million Min
â Low THD at 10kHz, AV = â10, RL = 600â¦: 0.002%
VO = 7VRMS
â Low IMD, CCIF Method, AV = +10: 0.002%
RL = 600â¦
VO = 7VRMS
U
APPLICATIO S
â High Quality Audio Preamplifiers
â Low Noise Microphone Preamplifiers
â Very Low Noise Instrumentation Amplifiers
â Low Noise Frequency Synthesizers
â Infrared Detector Amplifiers
â Hydrophone Amplifiers
â Low Distortion Oscillators
DESCRIPTIO
The LT®1115 is the lowest noise audio operational ampli-
fier available. This ultralow noise performance (0.9nV/âHz
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)
100⦠(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
100⦠1 A2
LT1115
2â
4
2N4304*
~250â¦
LT1010CT
3
2mA SELECT
FOR 2mA
1µF
1µF
â18V
35V
35V
â18V
RBOOST
49.9â¦
4
5
562â¦
RL
25k
OUTPUT
3900pF
V+
+
COM
+
Vâ
18V
470µF
35V
470µF
35V
â18V
499â¦
17.8k
210k
22.6â¦
330pF
210â¦
SINGLE
POINT
BOARD
+
GROUND
2200µF
16V
OPENâMM
CLOSEDâMC 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 = 25â¦
TA = 25°C
0.40000
0.20000
0.0
MEASURED
â0.2000
â0.4000
â0.6000
â0.8000
â1.000
20
COMPUTER
SIMULATED
100
1k
FREQUENCY (Hz)
10k 50k
LT1115 ⢠TA02
1115fa
1
|
▷ |