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LT1115 Ultralow Noise, Low Distortion, Audio Op Amp
FEATURES

DESCRIPTIO
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/s Min Voltage Gain: 2 Million Min Low THD at 10kHz, AV = -10, RL = 600: 0.002% VO = 7VRMS Low IMD, CCIF Method, AV = +10: 0.002% RL = 600 VO = 7VRMS
The LT (R)1115 is the lowest noise audio operational amplifier available. This ultralow noise performance (0.9nV/Hz at 1kHz) is combined with high slew rates (>15V/s) 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.
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
TYPICAL APPLICATIO
18V
RIAA Phonograph Preamplifier (40/60db Gain)
18V
+
INPUT RIN 47.5k (MM) 100 (MC) COM CIN (SELECT PER PHOTO CARTRIDGE) 3
+ -
7 6
1F 35V
1F 35V
+
2 1 A2 LT1010CT 3
RBOOST 49.9 4 5 562 OUTPUT 3900pF
2
A1 LT1115 4
100 2N4304* ~250 SELECT FOR 2mA
2mA 1F 35V
RL 25k
V+
499 18V
17.8k 330pF
+
COM
470F 35V
22.6
+
V-
470F 35V -18V
210 SINGLE POINT BOARD GROUND
OPEN--MM CLOSED--MC 82.5k 4.7F FILM
3900pF
+
2200F 16V
NOTE: BYPASS SUPPLIES WITH LOW ESR CAPS OTHER CAPS: HIGH QUALITY FILM
+
+
-18V
1F 35V
DEVIATION (dB)
-18V 210k
15nF RESISTORS 1% *OR USE 2mA CURRENT SOURCE MM = MOVING MAGNET MC = MOVING COIL
LT1115 * TA01
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Measured Deviation from RIAA Response. lnput at 1kHz = 1mVRMS Pre-Emphasized
1.0000 0.80000 0.60000 0.40000 0.20000 0.0 -0.2000 -0.4000 -0.6000 -0.8000 -1.000 20 100 1k FREQUENCY (Hz) 10k 50k
LT1115 * TA02
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VS = 18V RS = 25 TA = 25C
MEASURED COMPUTER SIMULATED
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LT1115
ABSOLUTE
(Note 1)
AXI U
RATI GS
Operating Temperature Range ..................... 0C to 70C Storage Temperature Range ..................-65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Supply Voltage ...................................................... 22V Differential Input Current (Note 5) ...................... 25mA Input Voltage ............................ Equal to Supply Voltage Output Short-Circuit Duration .......................... Indefinite
PACKAGE DESCRIPTIO
TOP VIEW VOS TRIM 1 -IN 2 +IN 3 V- 4 VOS TRIM 7 V+ 8 - + 6 OUT OVER5 COMP
ORDER PART NUMBER LT1115CN8
N PACKAGE 8-LEAD PDIP TJMAX = 115C, JA = 130C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL THD IMD VOS IOS IB en PARAMETER Total Harmonic Distortion at 10kHz Inter-Modulation Distortion (CCIF) Input Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage Density Wideband Noise Corresponding Voltage Level re 0.775V in Input Noise Current Density (Note 3) Input Resistance Common Mode Differential Mode Input Capacitance Input Voltage Range
CONDITIONS Av = -10, VO = 7VRMS, RL = 600 Av = 10, VO = 7VRMS, RL = 600 (Note 2) VCM = 0V VCM = 0V fo = 10Hz fo = 1000Hz, 100% tested DC to 20kHz
fo = 10Hz fo = 1000Hz, 100% tested
2
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U
WW
W
TOP VIEW NC 1 NC 2 TRIM 3 -IN 4 +IN 5 V- 6 - + 16 NC 15 NC 14 TRIM 13 V + 12 OUTPUT 11 OVERCOMP 10 NC 9 NC
ORDER PART NUMBER LT1115CSW
NC 7 NC 8
SW PACKAGE 16-LEAD PLASTIC SO TMAX = 115C, JA = 130C/W
LT1115 * POI01
VS = 18V, TA = 25C, unless otherwise noted.
MIN TYP < 0.002 < 0.0002 50 30 50 1.0 0.9 120 - 136 4.7 1.2 250 15 5 13.5 15.0 200 200 380 1.2 MAX UNITS % % V nA nA nV/Hz nV/Hz nVRMS dB pA/Hz pA/Hz M k pF V
2.2
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LT1115
ELECTRICAL CHARACTERISTICS
SYMBOL CMRR PSRR AVOL PARAMETER Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain
VS = 18V, TA = 25C, unless otherwise noted.
MIN 104 104 2.0 1.5 1.0 15.5 14.5 11.0 10 40 TYP 123 126 20 15 10 16.5 15.5 14.5 15 70 70 8.5 11.5 MAX UNITS dB dB V/V V/V V/V V V V V/s MHz mA
CONDITIONS VCM = 13.5V VS = 4V to 19V RL 2k, Vo = 14.5V RL 1k, Vo = 13V RL 600, Vo = 10V No Load RL 2k RL 600 AVCL = -1 fo = 20kHz (Note 4) Vo = 0, Io = 0
VOUT
Maximum Output Voltage Swing Slew Rate Gain-Bandwidth Product Open Loop 0utput Impedance Supply Current
SR GBW Zo IS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 18V, unless otherwise noted.
SYMBOL VOS VOS/T IOS IB CMRR PSRR AVOL VOUT PARAMETER Input Offset Voltage Average Input Offset Drift Input Offset Current Input Bias Current Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Supply Current VCM = 13V VS = 4.5V to 18V RL 2k, Vo = 13V RL 1k, Vo = 11V No Load RL 2k RL 600 VCM = 0V VCM = 0V

CONDITIONS (Note 2)
MIN
TYP 75 0.5 40 70
MAX 280 300 550
UNITS V V/C nA nA V dB dB V/V V/V V V V
13 100 100 1.5 1.0 15 13.8 10
14.8 120 123 15 10 16.3 15.3 14.3 9.3 13

IS
mA
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Input Offset Voltage measurements are performed by automatic test equipment approximately 0.5 sec after application of power. Note 3: Current noise is defined and measured with balanced source resistors. The resultant voltage noise (after subtracting the resistor noise on an RMS basis) is divided by the sum of the two source resistors to obtain current noise.
Note 4: Gain-bandwidth product is not tested. It is guaranteed by design and by inference from the slew rate measurement. Note 5: The inputs are protected by back-to-back diodes. Current limiting resistors are not used in order to achieve low noise. If differential input voltage exceeds 1.8V, the input current should be limited to 25mA.
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LT1115 TYPICAL PERFOR A CE CHARACTERISTICS
Wideband Noise, DC to 20kHz
10
VS = 18V TA = 25C
TOTAL NOISE DENSITY (nV/Hz)
RMS VOLTAGE NOISE (V)
0.5V/DIV
FPO
0.5ms/DIV
0.01 100 1k 100k 10k BANDWIDTH (Hz) 1M 10M
0.1 1
THD + Noise vs Frequency (AV = -10)
TOTAL HARMONIC DISTORTION + NOISE (%)
TOTAL HARMONIC DISTORTION + NOISE (%)
TOTAL HARMONIC DISTORTION + NOISE (%)
0.010 AV = - 10 RL = 600 VIN = 2VP-P (700mVRMS) VOUT = 20VP-P (7VRMS) TA = 25C VS = 18V
0.001
0.0005 20 100 1k FREQUENCY (Hz) 20k
LT1115 * TPC04
THD + Noise vs Frequency (AV = 10)
TOTAL HARMONIC DISTORTION + NOISE (%)
TOTAL HARMONIC DISTORTION + NOISE (%)
AV = 10 RL = 600 VIN = 2VP-P (700mVRMS) VOUT = 20VP-P (7VRMS) TA = 25C VS = 18V
AV = 100 VIN = 200mVP-P (700VRMS) VOUT = 20mVP-P (7VRMS) TA = 25C RL = 600 VS = 18V 0.010
TOTAL HARMONIC DISTORTION + NOISE (%)
0.010
0.001
0.0005 20 100 1k FREQUENCY (Hz) 20k
LT1115 * TPC07
4
UW
Wideband Voltage Noise (0.1Hz to Frequency Indicated)
100
Total Noise vs Matched Source Resistance
RS - RS +
1
10
AT 10Hz 1.0
AT 1kHz 2 RS NOISE ONLY
0.1
VS = 18V TA = 25C 3 10 30 100 300 1k 3k 10k MATCHED SOURCE RESISTANCE, RS ()
LT1115 * TPC03
LT1115 * TPC02
THD + Noise vs Frequency (AV = -100)
0.1 AV = -100 RL = 600 VIN = 200mVP-P (70mVRMS) VOUT = 20VP-P (7VRMS) TA = 25C VS = 18V 0.010
0.1
THD + Noise vs Frequency (AV = -1000)
AV = - 1000 RL = 600 VIN = 20mVP-P (7mVRMS) VOUT = 20VP-P (7VRMS) TA = 25C VS = 18V 0.010
0.001 20
0.001
100
1k FREQUENCY (Hz)
20k
LT1115 * TPC05
20
100
1k FREQUENCY (Hz)
20k
LT1115 * TPC06
THD + Noise vs Frequency (AV = 100)
0.1
0.1
THD + Noise vs Frequency (AV = 1000)
AV = 1000 VIN = 20mVP-P (7mVRMS) VOUT = 20VP-P (7VRMS) TA = 25C RL = 600 VS = 18V 0.010
0.001
0.0005 20 100 1k FREQUENCY (Hz) 20k
LT1115 * TPC08
0.001 20
100
1k FREQUENCY (Hz)
20k
LT1115 * TPC09
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LT1115 TYPICAL PERFOR A CE CHARACTERISTICS
CCIF IMD Test (Twin Equal Amplitude Tones at 13 and 14kHz)*
INTERMODULATION DISTORTION (at 1kHz) (%)
INTERMODULATION DISTORTION (at 1kHz) (%)
0.1 AV = 10 RL = 600 TA = 25C VS = 18V 0.010
SLEW RATE (V/s)
0.001
0.0001 10m
0.1 1 OUTPUT AMPLITUDE (VRMS)
Total Noise vs Unmatched Source Resistance
100 RS
CURRENT NOISE DENSITY (pA/Hz) TOTAL NOISE DENSITY (nV/Hz)
100
RMS VOLTAGE NOISE DENSITY (nV/Hz)
10
AT 10Hz 1.0
AT 1kHz RS NOISE ONLY
VS = 18V TA = 25C 0.1 1 3 10 30 100 300 1k 3k 10k UNMATCHED SOURCE RESISTANCE, RS ()
LT1115 * TPC13
Voltage Noise vs Supply Voltage
1.5
10
RMS VOLTAGE NOISE DENSITY (nV/Hz)
TA = 25C
1.25
SUPPLY CURRENT (mA)
8 7 6 5 4 3 2 1
VS = 15V VS = 5V
SHORT-CIRCUIT CURRENT (mA) SINKING SOURCING
1.0 AT 1kHz 0.75
0.5 0 5 10 15 SUPPLY VOLTAGE (V) 20
LT1115 * TPC16
*See CCIF Test Note at end of "Typical Performance Characteristics".
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10
LT1115 * TPC10
CCIF IMD Test (Twin Equal Amplitude Tones at 13 and 14kHz)*
0.1 AV = 10 RL = 10k TA = 25C VS = 18V 0.010
Slew Rate, Gain-Bandwidth-Product vs Overcompensation Capacitor
100 10000
10
GWB
1000
GAIN AT 20kHz
SLEW 1 COC FROM PIN 5 TO PIN 6 VS = 18V TA = 25C 1 100
0.001
0.0001 10m
0.1
1 0.1 OUTPUT AMPLITUDE (VRMS) 10
10 10000 1000 10 100 OVERCOMPENSATION CAPACITOR (pF)
LT1115 * TPC12
LT1115 * TPC11
Current Noise Spectrum
2.0
Voltage Noise vs Temperature
VS = 18V 1.6
10
1.2
AT 10Hz AT 1kHz
TYPICAL 1 1/f CORNER = 250Hz
0.8
0.4
0.1 10
0
1k 100 FREQUENCY (Hz) 10k
LT1115 * TPC14
0
15
30 45 TEMPERATURE (C)
60
75
LT1115 * TPC15
Supply Current vs Temperature
50
VS = 18V 9
Output Short-Circuit Current vs Time
40 30 20 10 0 - 10 - 20 - 30 - 40 25C VS = 18V 25C
0 0 15 30 45 TEMPERATURE (C) 60 75
LT1115 * TPC17
- 50 2 3 0 1 TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
LT1115 * TPC18
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LT1115 TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Gain vs Frequency
160 140 120
70 60
VOLTAGE GAIN (dB)
100 80 60 40 20 0 VS = 18V TA = 25C RL = 2k 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) LT1115 * TPC19
VOLTAGE GAIN (V/V)
VOLTAGE GAIN (dB)
-20 0.01 0.1 1
Voltage Gain vs Load Resistance
100
80
COMMON MODE LIMIT (V) REFERRED TO POWER SUPPLY
VS = 18V TA = 25C ILMAX = 27mA AT 25C OVERSHOOT (% )
VOLTAGE GAIN (V/V)
10
1 0.1
1 LOAD RESISTANCE (k)
Common Mode Rejection Ratio vs Frequency
140
COMMON MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
120 100 80 60 40 20 0 10 VS = 18V TA = 25C 100 10k 1k 100k FREQUENCY (Hz) 1M 10M
100 80 60 40 20 VS = 18V TA = 25C 1 10 POSITIVE SUPPLY
NEGATIVE SUPPLY
5V/DIVISION
6
UW
Gain, Phase vs Frequency
70
Voltage Gain vs Supply Voltage
100 TA = 25C
60 50 40 30
PHASE
50 40 30
RL = 2k RL = 600 10
PHASE MARGIN (DEGREES)
GAIN
20 10 0 20 10
- 10 10k
VS = 18V TA = 25C CL = 10pF
100k 1M 10M FREQUENCY (Hz)
0 - 10 100M
LT1115 * TPC20
1 0 10 15 5 SUPPLY VOLTAGE (V) 20
LT1115 * TPC21
Capacitance Load Handling
V+ -1
30pF
Common Mode Limit Over Temperature
70 60 50 40 30 20 10 0
RS
+ -
2k CL
-2 -3 -4
VS = 5V VS = 18V
AV = - 1, RS = 2k AV = - 10 RS = 200 AV = - 100 RS = 20 VS = 18V TA = 25C 10000
LT1115 * TPC23
+4 +3 +2 +1 V- 0 15 30 45 TEMPERATURE (C) 60 75 VS = 5V TO 18V
10
LT1115 * TPC22
10
100 1000 CAPACITIVE LOAD, CL (pF)
LT1115 * TPC24
Power Supply Rejection Ratio vs Frequency
160 140 120
Large-Signal Transient Response
FPO
1s/DIVISION AV = -1 RS = Rf = 2k Cf = 30pF
0 0.1
LT1115 * TPC25
100 1k 10k 100k 1M 10M FREQUENCY (Hz)
LT1115 * TPC26
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LT1115 TYPICAL PERFOR A CE CHARACTERISTICS
Small-Signal Transient Response
30
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
20 15 10 *POWER BANDWIDTH SLEW RATE fP = EOP 5 f = POWER BANDWIDTH P EP-P = PEAK-TO-PEAK AMPLIFIER 0 10k
OUTPUT VOLTAGE
OUTPUT IMPEDANCE ()
20mV/DIVISION
0.2s/DIVISION AV = -1, RS = Rf = 2k Cf = 30pF CL = 80pF
FPO
APPLICATIO S I FOR ATIO
The LT1115 is a very high performance op amp, but not necessarily one which is optimized for universal application. Because of very low voltage noise and the resulting high gain-bandwidth product, the device is most applicable to relatively high gain applications. Thus, while the LT1115 will provide notably superior performance to the 5534 in most applications, the device may require circuit modifications to be used at very low noise gains. The part is not generally applicable for unity gain followers or inverters. In general, it should always be used with good low impedance bypass capacitors on the supplies, low impedance feedback values, and minimal capacitive loading. Ground plane construction is recommended, as is a compact layout.
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FPO
Maximum Output vs Frequency (Power Bandwidth*)
VS = 18V TA = 25C RL = 2k
100
Closed-Loop Output Impedance
IO = 1mA VS = 18V TA = 25C
25
10
1 AV = 1000 0.1 AV = 5 0.01
1M 100k FREQUENCY (Hz)
10M
LT1115 * TPC29
0.001 10
100
10k 1k FREQUENCY (Hz)
100k
1M
LT1115 * TPC30
CCIF Testing Note: The CCIF twin-tone intermodulation test inputs two closely spaced equal amplitude tones to the device under test (DUT). The analyzer then measures the intermodulation distortion (IMD) produced in the DUT by measuring the difference tone equal to the spacing between the tones. The amplitude of the lMD test input is in sinewave peak equivalent terms. As an example, selecting an amplitude of 1.000V will result in the complex IMD signal having the same 2.828V peak-to-peak amplitude that a 1.000V sinewave has. Clipping in a DUT will thus occur at the same input amplitude for THD + N and IMD modes.
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Voltage Noise vs Current Noise The LT1115's less than 1nV/Hz voltage noise matches that of the LT1028 and is three times better than the lowest voltage noise heretofore available (on the LT1007/1037). A necessary condition for such low voltage noise is operating the input transistors at nearly 1mA of collector currents, because voltage noise is inversely proportional to the square root of the collector current. Current noise, however, is directly proportional to the square root of the collector current. Consequently, the LT1115's current noise is significantly higher than on most monolithic op amps.
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LT1115
APPLICATIO S I FOR ATIO
Therefore, to realize truly low noise performance it is important to understand the interaction between voltage noise (en), current noise (in) and resistor noise (rn). Total Noise vs Source Resistance The total input referred noise of an op amp is given by et = [en2 + rn2 + (inReq)2]1/2 where Req is the total equivalent source resistance at the two inputs and rn = 4kTReq = 0.13Req in nV/Hz at 25C As a numerical example, consider the total noise at 1kHz of the gain of 1000 amplifier shown below.
100 100k
-
LT1115
100
+
LT1115 * AI01
Req = 100 + 100||100k 200 rn = 0.13200 = 1.84nV/Hz en = 0.85nV/Hz in = 1.0pA/Hz et = [0.852 + 1.842 + (1.0 x 2.0)2]1/2 = 2.04nV/Hz output noise = 1000 et = 2.04V/Hz At very low source resistance (Req < 40) voltage noise dominates. As Req is increased resistor noise becomes the largest term--as in the example above--and the LT1115's voltage noise becomes negligible. As Req is further increased, current noise becomes important. At 1kHz, when Req is in excess of 20k, the current noise component is larger than the resistor noise. The Total Noise vs Matched Source Resistance plot in the Typical Performance Characteristics section, illustrates the above calculations.
8
U
The plot also shows that current noise is more dominant at low frequencies, such as 10Hz. This is because resistor noise is flat with frequency, while the 1/f corner of current noise is typically at 250Hz. At 10Hz when Req > 1k, the current noise term will exceed the resistor noise. When the source resistance is unmatched, the Total Noise vs Unmatched Source Resistance plot should be consulted. Note that total noise is lower at source resistances below 1k because the resistor noise contribution is less. When Rs > 1k total noise is not improved, however. This is because bias current cancellation is used to reduce input bias current. The cancellation circuitry injects two correlated current noise components into the two inputs. With matched source resistors the injected current noise creates a common-mode voltage noise and gets rejected by the amplifier. With source resistance in one input only, the cancellation noise is added to the amplifier's inherent noise. In summary, the LT1115 is the optimum amplifier for noise performance--provided that the source resistance is kept low. The following table depicts which op amp manufactured by Linear Technology should be used to minimize noise--as the source resistance is increased beyond the LT1115's level of usefulness.
Best Op Amp for Lowest Total Noise vs Source Resistance
SOURCE RESISTANCE (NOTE 1) 0 to 400 400 to 4k 4k to 40k 40k to 500k 500k to 5M > 5M BEST OP AMP AT LOW FREQ (10Hz) WIDEBAND (1kHz) LT1028/1115 LT1007/1037 LT1001* LT1012* LT1012* or LT1055 LT1055 LT1028/1115 LT1028/1115 LT1007/1037 LT1001* LT1012* LT1055 Note 1: Source resistance is defined as matched or unmatched, e.g., RS = 1k means: 1k at each input, or 1k at one input and zero at the other. *These op amps are best utilized in applications requiring less bandwidth than audio.
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LT1115
TYPICAL APPLICATIO S
R1 1k, 0.1% 18V R3 316k, 0.1%
INPUT
RP 30k 1%
R2 1k, 0.1%
R4 316k, 0.1%
Figure 1. Balanced Transformerless Microphone Preamp
THD + Noise vs Frequency (Figure 1)
TOTAL HARMONIC DISTORTION + NOISE (%)
1
TA = 25C RL = 100k VIN = 10mVRMS VOUT = 2.92VRMS RS = 150
0.1
0.010 20 100 1k FREQUENCY (Hz) 20k
LT1115 * TA04
+
U
+
2
- +
7 6
1F 35V LOW ESR
4.7F FILM
100 1% OUT
LT1115 3 4 -18V
1F 35V LOW ESR
10k 1% NOTE: MATCH RESISTOR PAIRS R1 = R3 TO 0.1% R4 R2
LT1115 * TA03
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LT1115
TYPICAL APPLICATIO S
18V
49.9
INPUT R1 100
3
+ -
4
LT1115 2 8 1
-18V
33.2k 1%
33.2k 1%
18V 1F 1F 35V
+
7 LT1097 3 4 100k 1F 35V 1F 2
6
OPTIONAL SERVO LOOP LOWERS OFFSET TO < 50V NOTE 1: USE SINGLE POINT GROUND. NOTE 2: USE 470F CAPACITORS AT EACH INCOMING SUPPLY TERMINAL (I.E. AT BOARD EDGE).
-18V
NOTE 3: FOR BETTER NOISE PERFORMANCE AT SLIGHTLY LESS DRIVE CAPABILITY: R1 = 43, R2 = 392 DELETE C1.
Figure 2. Low Noise DC Accurate x 10 Buffered Line Amplifier
THD + Noise vs Frequency (Figure 2)
TOTAL HARMONIC DISTORTION + NOISE (%)
0.010
TA = 25C VS = 18V VIN = 500mVRMS VOUT = 5VRMS RS = 10 RL = 600
0.001
0.0001 20 100 1k FREQUENCY (Hz) 20k
LT1115 * TA07
10
+
-
+
+
+
-18V 1F 35V
U
18V
+
7 6
1F 35V
RBOOST
+
1F 35V RL
100 C1 33pF IN 2N4304* 2mA R2 909 ~250 SELECT FOR 2mA LT1010CT V-
V+
OUTPUT
RESISTORS 1% METAL FILM CAPACITORS - BYPASS; LOWER ESR OTHER: POLYESTER OR OTHER 1F HIGH QUALITY FILM. 35V *OR USE 2mA CURRENT SOURCE.
100k
LT1115 * TA05
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LT1115
TYPICAL APPLICATIO S
100pF GAIN: 40dB 30dB 24.9 75 2.49k 18V 0.01F 100 2
INPUT
18V - 18V
100F 35V 18V
100k 1F 100V 4
-18V 100F RESISTORS 1% METAL FILM 35V CAPACITORS--BYPASS: LOW ESR OTHER: HIGH QUALITY FILM NOTE 1: USE SINGLE POINT GROUNDING TECHNIQUES
Figure 3. RIAA Moving Coil "Pre-Pre" Amplifier (40/30dB Gain Low Noise Servo'd Amplifier)
INTERMODULATION DISTORTION (AT 1kHz) (IMD) (%)
CCIF IMD Test (Twin Tones at 13 and 14kHz) (Figure 3)
0.1 TA = 25C VS = 18V RL = 100k 0.010
10
1
NOISE (V)
0.001
100n
0.0001 0.1
10n
1 OUTPUT AMPLITUDE (VRMS) 10
LT1115 * TA08
20
+
+
3
-
U
475
OUTPUT TO RIAA STAGE
7 6
+
1F 35V
1M
LT1115 4 6 7
+ -
3 1F 100V
LT1097 2
1M
+ +
- 18V
1F 35V
LT1115 * TA06
Noise vs Frequency (Figure 3)
TA = 25C VS = 18V INPUT GROUNDED
100
1k FREQUENCY (Hz)
20k
NOTE: NOISE AT 1kHz REFERRED TO INPUT ~2nV
LT1115 * TA09
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LT1115
TYPICAL APPLICATIO S
18V 1F 35V
+
100pF
12.1
2
- +
MOVING COIL INPUT 100
3
LT1115 4
-18V 470F 35V
Figure 4. Moving Coil Passive RIAA Phonograph Pre-Amp
Deviation from RIAA Response Input at 1kHz = 232VRMS Pre-Emphasized (Figure 4)
0.40000 0.30000
VS = 18V RL = 100k RS = 10 TA = 25C
THD + Noise vs Frequency Input at 1kHz = 232VRMS Pre-Emphasized (Figure 4)
TOTAL HARMONIC DISTORTION + NOISE (%)
0.50000
0.1
VS = 18V RL = 100k RS = 10 TA = 25C
DEVIATION (dB)
0.20000 0.10000 0.0 - 0.1000 - 0.2000 - 0.3000 - 0.4000 - 0.5000 20
0.010
100
1k FREQUENCY (Hz)
20k
LT1115 * TA11
0.001 20
12
+
+
+
0.01F
U
+
470F 35V
2.49k
RIAA NETWORK
+ 1F
7 6 R1 6081 35V 3
+ -
7 LT1056 6
4.7F FILM OUTPUT 499 100k 10k 1F 35V
1F 35V
C1 0.1645F
2 R2 490 C2 0.483F
4
499
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: R1-6249 C1-0.161F LT1115 * TA10 R2-504 C2-0.47F
1k 100 FREQUENCY (Hz)
20k
LT1115 * TA12
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LT1115
TYPICAL APPLICATIO S
470F 35V
2.5k REV. AUDIO 1F 35V TAPER
+
1N4002 49.9
4.99 2 100 3
- +
7 LT1115 4 6
RED
YELLOW
150 MICROPHONE INPUT BRN
6.19k ORANGE BLK CASE
JENSEN JE-16-A/B
1N4002 -18V 18V 1F 10k 1F 35V
+
7 6 2 100k
LT1097 3 100k 4
10
Figure 5. High Performance Transformer Coupled Microphone Pre-Amp Risetime of High Performance Transformer Coupled Microphone Pre-Amp (Figure 5)
TOTAL HARMONIC DISTORTION + NOISE (%) 1
THD + Noise vs Frequency (Gain = 20dB) Balanced In/ Balanced Out (Figure 5)
AMPLITUDE (dB) REFERRED TO 1kHz
0.1
VS = 18V VIN = 0.95VRMS RL = 600 RS = 150 TA = 25C
0.010
RISETIME OF PRE-AMP AV = 20dB VIN = 400mV 2kHz SQUARE WAVE MEASURED AT SINGLEENDED OUTPUT BEFORE TRANSFORMER
0.001 0.0005 20 100 1k FREQUENCY (Hz) 20k
LT1115 * TA15
+
1F 35V
-18V
+
-
+
+
WHT
+
+
U
18V
+
1F 35V
100pF 22 100
IN
V+ BOOST LT1010CT OUT V- 2.49k 10
OPTIONAL SINGLE-ENDED TO BALANCED OUTPUT TRANSFORMER
BRN RED
2N4304** ~250 SELECT FOR 2mA
YEL
2mA
JENSEN JE-11-BM 1F 35V 470F 35V 1F 35V RESISTORS 1% METAL FILM CAPACITORS--BYPASS: LOW ESR OTHER: HIGH QUALITY FILM NOTE: USE SINGLE POINT GROUND
* JENSEN NETWORK VALUES--FACTORY SELECTED. JE-16-A/B & JE-11-BM AVAILABLE FROM: JENSEN TRANSFORMERS 10735 BURBANK BLVD. N. HOLLYWOOD, CA 91601 (213) 876-0059 ** OR USE 2mA CURRENT SOURCE
LT1115 * TA13
1F
Frequency Response (Gain = 20dB) Balanced In/ Balanced Out (Figure 5)
1.0000 0.0 - 1.000 - 2.000 - 3.000 - 4.000 - 5.000 10 VS = 18V VIN = 0.95VRMS RL = 600 RS = 150 TA = 25C 100 10k 1k FREQUENCY (Hz) 100k
LT1115 * TA16
1115fa
13
LT1115
TYPICAL APPLICATIO S
C1 0.1F FILM R1 2k 200
200 15V R2
+ 1F
35V 6
7 LT1022
5.6k -15V 3
-15V
4 15V
500 (20T)
2.4k
10pF MOUNT, 1N4148's IN CLOSE PROXIMITY
4.7k -15V
+
470F 35V
1F 35V
+
-15V
10F
1k 120k
2.5V LT1004's 1.2V f= 1 2RC WHERE R1C1 = R2C2 MEASURED WITH R1 = R2 = 1.5k
-15V 470F 35V
+
1F
10k
10k
+
VACTEC VTL 5C10 100
+
15V
LT1006 4
Figure 6. Ultralow THD Oscillator (Sine Wave) (< 5ppm Distortion)
14
-
1F 35V 7
<5ppm DISTORTION AND NOISE AT 1kHz, 20VP-P INTO 100 MEASUREMENT LIMITED BY RESOLUTION OF AUDIO PRECISION TEST SYSTEM ALL BYPASS CAPACITORS: LOW ESR FILM CAPACITORS = ASC TYPE 315
LT1115 * TA17
+
2
+
U
15V
+
3 2k 2 7
1F 35V
+
LT1115
C2 0.1F FILM + 1F 35V 100 IN 1
15V RBOOST = 49.9 2 4 LT1010 3 5 20VP-P OUTPUT
-
4
+ - +
1F 35V
1F 35V
+
1115fa
LT1115
PACKAGE DESCRIPTIO U
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5 .255 .015* (6.477 0.381) 1 .300 - .325 (7.620 - 8.255) 2 3 4 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
.008 - .015 (0.203 - 0.381) +.035 .325 -.015
(
8.255
+0.889 -0.381
)
.100 (2.54) BSC
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
1115fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1115
PACKAGE DESCRIPTIO U
SW Package 16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.030 .005 TYP N .050 BSC .045 .005 .398 - .413 (10.109 - 10.490) NOTE 4 16 15 14 13 12 11 10 9 N .420 MIN .325 .005 NOTE 3 .394 - .419 (10.007 - 10.643) N/2 N/2 1 .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737)
0 - 8 TYP
1
2
3
RECOMMENDED SOLDER PAD LAYOUT 2 3 4 5 6 7 8
.093 - .104 (2.362 - 2.642)
.037 - .045 (0.940 - 1.143)
.005 (0.127) RAD MIN
.009 - .013 (0.229 - 0.330)
NOTE 3 .016 - .050 (0.406 - 1.270)
.050 (1.270) BSC
.004 - .012 (0.102 - 0.305)
NOTE: 1. DIMENSIONS IN
.014 - .019 (0.356 - 0.482) TYP
S16 (WIDE) 0502
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
1115fa
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LW/TP 1102 1K REV A * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1989

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