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SSM2135S-REEL-SSM2135S-REEL7-SSM2135SZ-SSM2135SZ-REEL
Dual Single-Supply Audio Operational Amplifier
REV.E
Dual Single-Supply
Audio Operational Amplifier
FEATURES
Excellent Sonic Characteristics
High Output Drive Capability
5.2 nV/÷Hz Equivalent Input Noise @ 1 kHz
0.001% THD+N (VO = 2.5 V p-p @ 1 kHz)
3.5 MHz Gain Bandwidth
Unity-Gain Stable
Low Cost
APPLICATIONS
Multimedia Audio Systems
Microphone Preamplifier
Headphone Driver
Differential Line Receiver
Balanced Line Driver
Audio ADC Input Buffer
Audio DAC l-V Converter and Filter
Pseudo-Ground Generator
PIN CONNECTIONS
8-Lead Narrow-Body SOIC
(S Suffix)
GENERAL DESCRIPTIONThe SSM2135 Dual Audio Operational Amplifier permits excel-
lent performance in portable or low power audio systems, with
an operating supply range of +4 V to +36 V or ±2 V to ±18 V.
The unity gain stable device has very low voltage noise of
4.7 nV/÷Hz, and total harmonic distortion plus noise below 0.01%
over normal signal levels and loads. Such characteristics are
enhanced by wide output swing and load drive capability. A unique
output stage* permits output swing approaching the rail under
moderate load conditions. Under severe loading, the SSM2135
still maintains a wide output swing with ultralow distortion.
Particularly well suited for computer audio systems and portable
digital audio units, the SSM2135 can perform preamplification,
headphone and speaker driving, and balanced line driving and
receiving. Additionally, the device is ideal for input signal condi-
tioning in single-supply, sigma-delta, analog-to-digital converter
subsystems such as the AD1878/AD1879.
The SSM2135 is available in an 8-lead plastic SOIC package
and is guaranteed for operation over the extended industrial
temperature range of –40∞C to +85∞C.
FUNCTIONAL BLOCK DIAGRAM*. Patent No. 5,146,181.
SSM2135–SPECIFICATIONSAUDIO PERFORMANCE
Specifications subject to change without notice.
(VS = 5 V, –40�C < TA < +85�C, unless otherwise noted.
Typical specifications apply at TA = +25�C.)
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
SSM2135 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.
ABSOLUTE MAXIMUM RATINGSSupply Voltage
Single Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V
Dual Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Differential Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . 10 V
Output Short Circuit Duration. . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range. . . . . . . . . . . . . –65∞C to +150∞C
Operating Temperature Range. . . . . . . . . . . . –40∞C to +85∞C
Junction Temperature Range (TJ). . . . . . . . . –65∞C to +150∞C
Lead Temperature (Soldering, 60 sec). . . . . . . . . . . . . 300∞C
ESD RATINGS883 (Human Body) Model. . . . . . . . . . . . . . . . . . . . . . . . 1 kV
EIAJ Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 V
THERMAL CHARACTERISTICS
Thermal Resistance**qJA is specified for worst case conditions, i.e., qJA is specified for device sol-
dered in circuit board for SOIC package.
ORDERING GUIDE
ModelSSM2135S
SSM2135–Typical Performance CharacteristicsTest Circuit 1.Test Circuit for TPCs 1, 2, and 3
TPC 1.THD+N vs. Amplitude (See Test Circuit 1; AV = +1,
VS = 5 V, f = 1 kHz, with 80 kHz Low-Pass Filter)
TPC 2.THD+N vs. Frequency (See Test Circuit 1;
AV = +1, VIN = 1 V p-p, with 80 kHz Low-Pass Filter)
TPC 3.THD+N vs. Load (See Test Circuit)
TPC 4.THD+N vs. Gain
TPC 5.THD+N vs. Supply Voltage
TPC 6.SMPTE Intermodulation Distortion (AV = +1,
VS = 5 V, f = 1 kHz, RL = 10 kW)
TPC 7.Input Voltage Noise (20 nV/div)
TPC 8.Voltage Noise Density vs. Frequency
TPC 9.Current Noise Density vs. Frequency
TPC 10.Frequency Response (AV = +1, VS = 5 V,
VIN = 1 V p-p, RL = 10 kW)
TPC 11.Square Wave Response (VS = 5 V, AV = +1,
RL = •)
SSM2135TPC 12.Crosstalk vs. Frequency (RL = 10 kW)
TPC 13.Common-Mode Rejection vs. Frequency
TPC 14.Power Supply Rejection vs. Frequency
TPC 15.Closed-Loop Gain vs. Frequency
TPC 16.Open-Loop Gain and Phase vs. Frequency
TPC 17.Small Signal Overshoot vs. Load Capacitance
TPC 18.Output Impedance vs. Frequency
TPC 19.Maximum Output Voltage vs. Load Resistance
TPC 20.Maximum Output Swing vs. Frequency
TPC 21.Output Swing vs. Supply Voltage
TPC 22.Output Swing vs. Temperature and Load
TPC 23.Slew Rate vs. Temperature
SSM2135TPC 24.Open-Loop Gain vs. Temperature
TPC 25.Gain Bandwidth Product and Phase Margin
vs. Temperature
TPC 26.Supply Current vs. Temperature
TPC 27.Input Bias Current vs. Temperature
APPLICATION INFORMATIONThe SSM2135 is a low voltage audio amplifier that has excep-
tionally low noise and excellent sonic quality even when driving
loads as small as 25 W. Designed for single supply use, the
SSM2135’s inputs common-mode and output swing to 0 V.
Thus with a supply voltage at 5 V, both the input and output
will swing from 0 V to 4 V. Because of this, signal dynamic
range can be optimized if the amplifier is biased to a 2 V reference
rather than at half the supply voltage.
The SSM2135 is unity-gain stable, even when driving into a fair
amount of capacitive load. Driving up to 500 pF does not cause
any instability in the amplifier. However, overshoot in the fre-
quency response increases slightly.
The SSM2135 makes an excellent output amplifier for 5 V only
audio systems such as a multimedia workstation, a CD output
amplifier, or an audio mixing system. The amplifier has large
output swing even at this supply voltage because it is designed
to swing to the negative rail. In addition, it easily drives load
The SSM2135 is fully protected from phase reversal for inputs
going to the negative supply rail. However, internal ESD protec-
tion diodes will turn on when either input is forced more than
0.5 V below the negative rail. Under this condition, input cur-
rent in excess of 2 mA may cause erratic output behavior, in
which case a current limiting resistor should be included in the
offending input if phase integrity is required with excessive input
voltages. A 500 W or higher series input resistor will prevent
phase inversion even with the input pulled 1 V below the nega-
tive supply.
“Hot” plugging the input to a signal generally does not present a
problem for the SSM2135, assuming the signal does not have
any voltage exceeding the device’s supply voltage. If so, it is
advisable to add a series input resistor to limit the current, as
well as a Zener diode to clamp the input to a voltage no higher
than the supply.
