Datasheet

11
LT1115
1115fa
Figure 3. RIAA Moving Coil “Pre-Pre” Amplifier
(40/30dB Gain Low Noise Servo’d Amplifier)
Noise vs Frequency (Figure 3)
–
+
–
+
18V
18V
18V
–18V
–18V
– 18V
100k
100V
2.49k
100Ω
75Ω
475Ω
100µF
35V
1µF
35V
100µF
35V
INPUT
0.01µF
GAIN: 40dB
30dB
1µF
35V
1µF
100V
1µF
1M
1M
100pF
OUTPUT
TO
RIAA
STAGE
RESISTORS 1% METAL FILM
CAPACITORS—BYPASS: LOW ESR
OTHER: HIGH QUALITY FILM
3
3
2
2
7
7
6
6
4
4
24.9Ω
NOTE 1: USE SINGLE POINT
GROUNDING TECHNIQUES
LT1115
LT1097
LT1115 • TA06
+
+
+
+
FREQUENCY (Hz)
20
10n
NOISE (V)
100n
1µ
10µ
100 1k
20k
T
A
= 25
°
C
V
S
= ±18V
INPUT GROUNDED
NOTE: NOISE AT 1kHz REFERRED TO INPUT ~2nV
LT1115 • TA09
CCIF IMD Test (Twin Tones at 13
and 14kHz) (Figure 3)
OUTPUT AMPLITUDE ( V
RMS
)
0.1
0.0001
0.1
0.010
0.001
1
10
INTERMODULATION DISTORTION (AT 1kHz) (IMD) (%)
T
A
= 25
°
C
V
S
= ± 18V
R
L
= 100k
LT1115 • TA08
TYPICAL APPLICATIO S
U