LT1115_15 Datasheet, PDF (1/16 Pages) Linear Technology – Ultralow Noise, Low Distortion, Audio Op Amp

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%}
V_O = 7V_RMS
■ _{Low IMD, CCIF Method, AV = +10: 0.002%}
R_L = 600Ω
V_O = 7V_RMS
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
R_IN 47.5k (MM)
100Ω (MC)
COM
RIAA Phonograph Preamplifier (40/60db Gain)
C_IN
(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
R_BOOST
49.9Ω
4
5
562Ω
R_L
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 = 1mV_RMS
Pre-Emphasized
1.0000
0.80000
0.60000
V_S = ± 18V
R_S = 25Ω
T_A = 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