DRV602 Datasheet, PDF (6/12 Pages) Texas Instruments – DIRECTPATH™, 2Vrms Line Driver with Adjustable gain

DRV602
SLOS572 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
APPLICATION INFORMATION
Line Driver Amplifiers
Single-supply line driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 5 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 &
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.
9-12 V
+
+
Co
OPAMP
+
-
Conventional Solution
Mute Circuit
Output
GND
VDD
VDD/2
Enable
5V
+
DRV602
-
DVR602 Solution
Output
DirectPath
VDD
GND
VSS
Enable
Figure 5. 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.
The DirectPath amplifier requires no output dc blocking capacitors.
The bottom block diagram and waveform of Figure 5 illustrate the ground-referenced Line Driver architecture.
This is the architecture of the DRV602.
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Product Folder Link(s): DRV602