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SSM2019BNZ
Self-Contained Audio Preamplifier
REV.0
Self-Contained
Audio Preamplifier
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe SSM2019 is a latest generation audio preamplifier, combin-
ing SSM preamplifier design expertise with advanced processing.
The result is excellent audio performance from a monolithic
device, requiring only one external gain set resistor or potentiom-
eter. The SSM2019 is further enhanced by its unity gain stability.
Key specifications include ultra-low noise (1.5 dB noise figure) and
THD (<0.01% at G = 100), complemented by wide bandwidth
and high slew rate.
Applications for this low cost device include microphone pream-
plifiers and bus summing amplifiers in professional and consumer
audio equipment, sonar, and other applications requiring a low
noise instrumentation amplifier with high gain capability.
FEATURES
Excellent Noise Performance: 1.0 nV/÷Hz or
1.5 dB Noise Figure
Ultra-low THD: < 0.01% @ G = 100 Over the
Full Audio Band
Wide Bandwidth: 1 MHz @ G = 100
High Slew Rate: 16 V/�s @ G = 10
10 V rms Full-Scale Input,
G = 1, VS = �18 V
Unity Gain Stable
True Differential Inputs
Subaudio 1/f Noise Corner
8-Lead PDIP or 16-Lead SOIC
Only One External Component Required
Very Low Cost
Extended Temperature Range: –40�C to +85�C
APPLICATIONS
Audio Mix Consoles
Intercom/Paging Systems
2-Way Radio
Sonar
Digital Audio Systems
PIN CONNECTIONS
8-Lead PDIP (N Suffix)
8-Lead Narrow Body SOIC (RN Suffix)*
16-Lead Wide Body SOIC (RW Suffix)*Consult factory for availability.
SSM2019–SPECIFICATIONS
(VS = �15 V and –40�C £ TA £ +85�C, unless otherwise noted. Typical specifications
apply at TA = 25�C.)NOISE PERFORMANCE
DYNAMIC RESPONSE
INPUT
OUTPUT
GAIN
POWER SUPPLY
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±19 V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .Supply Voltage
Output Short Circuit Duration . . . . . . . . . . . . . . . . . . . 10 sec
Storage Temperature Range . . . . . . . . . . . . –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 Resistance2
8-Lead PDIP (N) . . . . . . . . . . . . . . . . . . . . . . .�JA = 96∞C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .�JC = 37∞C/W
16-Lead SOIC (RW) . . . . . . . . . . . . . . . . . . . .�JA = 92∞C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .�JC = 27∞C/W
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.qJA is specified for worst-case mounting conditions, i.e., qJA is specified for device
in socket for PDIP; qJA is specified for device soldered to printed circuit board for
SOIC package.
TPC 1.Typical THD + Noise vs. Gain
TPC 2.Voltage Noise Density vs. Frequency
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. Although
the SSM2019 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
Typical Performance Characteristics
ORDERING GUIDE*Consult factory for availability.
SSM2019TPC 3.RTI Voltage Noise Density
vs. Gain
TPC 6.Output Voltage vs. Load
Resistance
TPC 9.CMRR vs. Frequency
TPC 4.Output Impedance vs.
Frequency
TPC 7.Input Voltage Range vs.
Supply Voltage
TPC 10.Positive PSRR vs. Frequency
TPC 5.Maximum Output Swing
vs. Frequency
TPC 8.Output Voltage Range vs.
Supply Voltage
TPC 11.Negative PSRR vs. Frequency
TPC 12.VIOS vs. Temperature
TPC 15.VOOS vs. Supply Voltage
TPC 18.Supply Current vs.
Temperature
TPC 13.VIOS vs. Supply Voltage
TPC 16.IB vs. Temperature
TPC 19.Supply Current vs. Supply
Voltage
TPC 14.VOOS vs. Temperature
TPC 17.IB vs. Supply Voltage
TPC 20.ISY vs. Supply Voltage
SSM2019Figure 1.Basic Circuit Connections
GAINThe SSM2019 only requires a single external resistor to set the
voltage gain. The voltage gain, G, is:
and the external gain resistor, RG, is:
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 SSM2019 is determined by the
tolerance of the external gain set resistor, RG, combined with the
gain equation accuracy of the SSM2019. Total gain drift combines
the mismatch of the external gain set resistor drift with that of
the internal resistors (20 ppm/∞C typ).
Bandwidth of the SSM2019 is relatively independent of gain,shown in Figure 2. For a voltage gain of 1000, the SSM2019
has a small-signal bandwidth of 200 kHz. At unity gain, the
bandwidth of the SSM2019 exceeds 4 MHz.
Figure 2.Bandwidth for Various Values of Gain
NOISE PERFORMANCEThe SSM2019 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 SSM2019 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
SSM2019 is obtained at the expense of current noise performance.
At low preamplifier gains, the effect of the SSM2019 voltage
and current noise is insignificant.
The total noise of an audio preamplifier channel can be calculated by:
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
impedance of 150 W, the total input referred noise is:
where:
en = 1 nV/÷Hz @ 1 kHz, SSM2019 en
in = 2 pA/÷Hz @ 1 kHz, SSM2019 in
RS = 150 W, microphone source impedance
et = 1.6 nV/÷Hz @ 1 kHz, microphone thermal noise
This total noise is extremely low and makes the SSM2019
virtually transparent to the user.
