Dual Single-Supply
Audio Operational Amplifier
SSM2135
PIN CONNECTIONS
Excellent sonic characteristics
High output drive capability
5.2 nV/√Hz equivalent input noise @ 1 kHz
0.003% THD + N (VOUT = 1 V p-p @ 1 kHz)
3.5 MHz gain bandwidth
Unity-gain stable
Low cost
OUT A 1
–IN A 2
8
SSM2135
V+
OUT B
TOP VIEW
6 –IN B
(Not to Scale)
V–/GND 4
5 +IN B
+IN A 3
7
00349-002
FEATURES
Figure 1. 8-Lead Narrow Body SOIC (R Suffix)
APPLICATIONS
Multimedia audio systems
Microphone preamplifiers
Headphone drivers
Differential line receivers
Balanced line drivers
Audio ADC input buffers
Audio DAC l-V converters and filters
Pseudoground generators
GENERAL DESCRIPTION
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 conditioning in single-supply, Σ-Δ, analog-todigital converter subsystems such as the AD1877. The SSM2135
makes an ideal single-supply stereo output amplifier for audio
digital-to-analog converters (DACs) because of its low noise
and distortion.
The SSM2135 dual audio operational amplifier permits excellent 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
5.2 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
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
V+
OUTx
+INx
9V 9V
V–/GND
00349-001
–INx
Figure 2.
Rev. G
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