LT1115_15 Datasheet, PDF (13/16 Pages) Linear Technology – Ultralow Noise, Low Distortion, Audio Op Amp

LT1115
TYPICAL APPLICATIO S
18V
2.5k
+
REV. AUDIO 1µF
TAPER 35V
470µF
35V
1N4002
49.9Ω
+
1µF
35V
RED
YELLOW
150Ω
MICROPHONE
INPUT
BRN
6.19k
ORANGE
BLK
WHT
CASE
JENSEN
JE-16-A/B
10Ω
4.99Ω
2_–
7
100Ω
LT1115
3₊
4
100pF
V⁺
22Ω
2.49k
6
100Ω _IN
BOOST
LT1010CT
OUT
2N4304**
V^–
~ 250Ω
2mA SELECT
FOR 2mA
OPTIONAL
SINGLE-ENDED TO
BALANCED OUTPUT
10Ω
TRANSFORMER
BRN
RED
YEL
JENSEN
JE-11-BM
1µF
470µF
1µF
35V
35V
35V
1N4002
–18V
RESISTORS 1% METAL FILM
CAPACITORS—BYPASS: LOW ESR
OTHER: HIGH QUALITY FILM
NOTE: USE SINGLE POINT GROUND
18V
*JENSEN NETWORK VALUES—FACTORY SELECTED.
+
1µF
1µF
35V
7
2
100k
JE-16-A/B & JE-11-BM AVAILABLE FROM:
JENSEN TRANSFORMERS
10735 BURBANK BLVD.
10k
6
LT1097
N. HOLLYWOOD, CA 91601
[phone]
3
**OR USE 2mA CURRENT SOURCE
4
1µF
100k
35V
–18V
1µF
LT1115 • TA13
Figure 5. High Performance Transformer Coupled Microphone Pre-Amp
Risetime of High Performance
Transformer Coupled Microphone
Pre-Amp (Figure 5)
RISETIME OF PRE-AMP
A_V = 20dB
V_IN = 400mV
2kHz SQUARE WAVE MEASURED AT SINGLE-
ENDED OUTPUT BEFORE TRANSFORMER
THD + Noise vs Frequency
(Gain = 20dB) Balanced In/
Balanced Out (Figure 5)
1
V_S = ± 18V
V_IN = 0.95V_RMS
R_L = 600Ω
R_S = 150Ω
0.1 ^{TA = 25°C}
0.010
0.001
0.0005
20
100
1k
FREQUENCY (Hz)
20k
LT1115 • TA15
Frequency Response
(Gain = 20dB) Balanced In/
Balanced Out (Figure 5)
1.0000
0.0
– 1.000
– 2.000
– 3.000
– 4.000
V_S = ± 18V
V_IN = 0.95V_RMS
R_L = 600Ω
R_S = 150Ω
T_A = 25^°C
– 5.000
10
100
1k
10k
FREQUENCY (Hz)
100k
LT1115 • TA16
1115fa
13