LT1115_15 Datasheet, PDF (12/16 Pages) Linear Technology – Ultralow Noise, Low Distortion, Audio Op Amp

LT1115
TYPICAL APPLICATIO S
1µF ⁺
35V
100pF
18V
+
470µF
35V
12.1Ω
MOVING COIL
INPUT
100Ω
2.49k
RIAA NETWORK
2_–
7
LT1115
3₊
4
0.01µF
R1
6
6081Ω
1µF
C1
35V 0.1645µF
1µF
35V
R2
490Ω
3₊
7
LT1056
6
2_–
4
10k
4.7µF FILM
499Ω
OUTPUT
100k
–18V
C2
0.483µF
470µF
35V
499Ω
1µF
35V _{RESISTORS 1% METAL FILM}
CAPACITORS—BYPASS: LOW ESR
OTHER: HIGH QUALITY FILM
NOTE 1: 1kHz GAIN = 53dB
NOTE 2: IN RIAA NETWORK VALUES SHOWN
ARE MEASURED AND PRODUCE THE
“DEVIATION FROM RIAA” GRAPH SHOWN.
THE CALCULATED EXACT VALUES ARE:
R1-6249Ω C1-0.161µF
R2-504Ω C2-0.47µF
LT1115 • TA10
Figure 4. Moving Coil Passive RIAA Phonograph Pre-Amp
Deviation from RIAA Response
Input at 1kHz = 232µV_RMS
Pre-Emphasized (Figure 4)
0.50000
0.40000
0.30000
0.20000
V_S = ± 18V
R_L = 100k
R_S = 10Ω
T_A = 25°C
0.10000
0.0
– 0.1000
– 0.2000
– 0.3000
– 0.4000
– 0.5000
20
100
1k
FREQUENCY (Hz)
20k
LT1115 • TA11
THD + Noise vs Frequency
Input at 1kHz = 232µV_RMS
Pre-Emphasized (Figure 4)
0.1
V_S = ± 18V
R_L = 100k
R_S = 10Ω
T_A = 25^°C
0.010
0.001
20
100
1k
FREQUENCY (Hz)
20k
LT1115 • TA12
1115fa
12