Datasheet

OPAMP
Co
MuteCircuit
Output
Enable
+
+
+
-
ConventionalSolution
DRV603
MuteCircuit
Output
Enable
5 V
+
-
DRV603Solution
VDD
VSS
GND
VDD
VDD/2
GND
DirectPath
9-12V
DRV603
www.ti.com SLOS617C –JANUARY 2009–REVISED NOVEMBER 2009
APPLICATION INFORMATION
LINE DRIVER AMPLIFIERS
Single-supply line-driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 11
illustrates the conventional line-driver amplifier connection to the load and output signal.
DC blocking capacitors are often large in value, and a mute circuit is needed during power up to minimize click
and pop. The output capacitor and mute circuit consume PCB area and increase cost of assembly, and can
reduce the fidelity of the audio output signal.
Figure 11. Conventional and DirectPath Line Driver
The DirectPath™ amplifier architecture operates from a single supply but makes use of an internal charge pump
to provide a negative voltage rail.
Combining the user-provided positive rail and the negative rail generated by the IC, the device operates in what
is effectively a split supply mode.
The output voltages are now centered at zero volts with the capability to swing to the positive rail or negative rail.
Combining this with the built-in click and pop reduction circuit, the DirectPath™ amplifier requires no output dc
blocking capacitors.
The bottom block diagram and waveform of Figure 11 illustrate the ground-referenced line-driver architecture.
This is the architecture of the DRV603.
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Product Folder Link(s): DRV603