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SSM2017-SSM2017P-SSM2017S
Self-Contained Audio Preamplifier
Self-ContainedAudio Preamplifier
FUNCTIONAL BLOCK DIAGRAM
+IN
OUT 5kΩ
SSM2017 5kΩ
5kΩ
PIN CONNECTIONS
Epoxy Mini-DIP (P Suffix)
16-Pin Wide Body SOL (S Suffix)NC
–IN
+IN
OUT
REFERENCE
RG1RG2
NC = NO CONNECT
FEATURES
Excellent Noise Performance: 950 pV/√Hz or 1.5 dB
Noise Figure
Ultralow THD: < 0.01% @ G = 100 Over the Full Audio
Band
Wide Bandwidth: 1 MHz @ G = 100
High Slew Rate: 17 V/ms typ
Unity Gain Stable
True Differential Inputs
Subaudio 1/f Noise Corner
8-Pin Mini-DIP with Only One External Component
Required
Very Low Cost
Extended Temperature Range: –408C to +858C
APPLICATIONS
Audio Mix Consoles
Intercom/Paging Systems
Two-Way Radio
Sonar
Digital Audio SystemsREV.C
GENERAL DESCRIPTIONThe SSM2017 is a latest generation audio preamplifier, combin-
ing SSM preamplifier design expertise with advanced process-
ing. The result is excellent audio performance from a self-
contained 8-pin mini-DIP device, requiring only one external
gain set resistor or potentiometer. The SSM2017 is further en-
hanced by its unity gain stability.
Key specifications include ultralow noise (1.5 dB noise figure)
and THD (<0.01% at G = 100), complemented by wide band-
width and high slew rate.
Applications for this low cost device include microphone pream-
plifiers and bus summing amplifiers in professional and con-
sumer audio equipment, sonar, and other applications requiring
a low noise instrumentation amplifier with high gain capability.
SSM2017–SPECIFICATIONS
(VS = 615 V and –408C ≤ TA ≤ +858C, unless otherwise noted. Typical speci-
fications apply at TA = +258C.)OUTPUT
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Typical Performance CharacteristicsFigure 1. Typical THD+Noise* at G = 1, 10, 100, 1000;
VO = 7 V rms, VS = ±15 V, RL = 5 kΩ; TA = +25°C
*80 kHz low-pass filter used for Figures 1-2.
ABSOLUTE MAXIMUM RATINGSSupply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±22 V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage
Output Short Circuit Duration . . . . . . . . . . . . . . . . . . . 10 sec
Storage Temperature Range (P, Z Packages) –65°C to +150°C
Junction Temperature (TJ) . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300°C
Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C
Thermal Resistance*
8-Pin Hermetic DIP (Z):θJA = 134; θJC = 12 . . . . . . °C/W
8-Pin Plastic DIP (P):θJA = 96; θJC = 37 . . . . . . . . . . °C/W
16-Pin SOIC (S):θJA = 92; θJC = 27 . . . . . . . . . . . . . °C/W
*θJA is specified for worst case mounting conditions, i.e., θJA is specified for device
in socket for cerdip and plastic DIP; θJA is specified for device soldered to printed
circuit board for SOL package.
ORDERING GUIDE*XIND = –40°C to +85°C.
Figure 2. Typical THD+ Noise * at G = 2, 10, 100, 1000;
VO = 10 V rms, VS = ±18 V, RL = 5 kΩ; TA = +25°C
SSM2017Figure 3.Voltage Noise Density vs.
Frequency
Figure 6. Maximum Output Swing
vs. Frequency
Figure 9. Output Voltage Range vs.
Supply Voltage
Figure 4.RTI Voltage Noise Density
vs. Gain
Figure 7. Maximum Output Voltage
vs. Load Resistance
Figure 10. CMRR vs. Frequency
Figure 5. Output Impedance vs.
Frequency
Figure 8. Input Voltage Range vs.
Supply Voltage
Figure 11. +PSRR vs. Frequency
Figure 12. –PSRR vs. Frequency
Figure 15. VOOS vs. Temperature
Figure 18. IB vs. Supply Voltage
Figure 13. VIOS vs. Temperature
Figure 16. VOOS vs. Supply Voltage
Figure 19. ISY vs. Temperature
Figure 14. VIOS vs. Supply Voltage
Figure 17. IB vs. Temperature
Figure 20. ISY vs. Supply Voltage
SSM2017Figure 21. Bandwidth of the SSM2017 for Various Values
of Gain
NOISE PERFORMANCEThe SSM2017 is a very low noise audio preamplifier exhibiting
a typical voltage noise density of only 1 nV/√Hz at 1 kHz. The
exceptionally low noise characteristics of the SSM2017 are in
part achieved by operating the input transistors at high collector
currents since the 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.
As a result, the outstanding voltage noise performance of the
SSM2017 is obtained at the expense of current noise perfor-
mance. At low preamplifier gains, the effect of the SSM2017’s
voltage and current noise is insignificant.
The total noise of an audio preamplifier channel can be calcu-
late by:
En =
where:
En = total input referred noise
en = amplifier voltage noise
in = amplifier current noise
RS = source resistance
et = source resistance thermal noise.
For a microphone preamplifier, using a typical microphone im-
pedance of 150 Ω the total input referred noise is:
en = 1 nV/√Hz @ 1 kHz, SSM2017 en
in = 2 pA/√Hz @ 1 kHz, SSM2017 in
RS = 150 Ω, microphone source impedance
et = 1.6 nV/√Hz @ 1 kHz, microphone thermal noise
En =√(1 nV√Hz)2 + 2 (pA/√Hz × 150 Ω)2 + (1.6 nV/√Hz)2
= 1.93 nV/√Hz @ 1 kHz.
This total noise is extremely low and makes the SSM2017
virtually transparent to the user.
G =
VOUT
(+In) ± (In) =
10kV
+1Basic Circuit Connections
GAINThe SSM2017 only requires a single external resistor to set the
voltage gain. The voltage gain, G, is:
G =
10kΩ+1
and
RG =
10kΩ±1
For convenience, Table I lists various values of RG for common
gain levels.
Table I. Values of RG for Various Gain LevelsThe voltage gain can range from 1 to 3500. A gain set resistor is
not required for unity gain applications. Metal-film or wire-
wound resistors are recommended for best results.
The total gain accuracy of the SSM2017 is determined by the
tolerance of the external gain set resistor, RG, combined with the
gain equation accuracy of the SSM2017. Total gain drift com-
bines the mismatch of the external gain set resistor drift with
that of the internal resistors (20 ppm/°C typ).
Bandwidth of the SSM2017 is relatively independent of gain as
shown in Figure 21. For a voltage gain of 1000, the SSM2017
has a small-signal bandwidth of 200 kHz. At unity gain, the
bandwidth of the SSM2017 exceeds 4 MHz.
