1 Features
1• Stereo DirectPath™ Audio Line Driver
– 2 Vrms Into 10 kΩ With 3.3-V Supply
• Low THD+N < 0.01% at 2 Vrms Into 10 kΩ
• High SNR, >90 dB
• 600-Ω Output Load Compliant
• Differential Input and Single-Ended Output
• Adjustable Gain by External Gain-Setting
Resistors
• Low DC Offset, <1 mV
• Ground-Referenced Outputs Eliminate DCBlocking
Capacitors
– Reduce Board Area
– Reduce Component Cost
– Improve THD+N Performance
– No Degradation of Low-Frequency Response
Due to Output Capacitors
• Short-Circuit Protection
• Click- and Pop-Reduction Circuitry
• External Undervoltage Mute
• Active Mute Control for Pop-Free Audio On/Off
Control
• Space-Saving TSSOP Package

2 Applications
• Set-Top Boxes
• Blu-ray Disc™, DVD Players
• LCD and PDP TV
• Mini/Micro Combo Systems
• Sound Cards
• Laptops

3 Description
The DRV632 is a 2-VRMS pop-free stereo line driver
designed to allow the removal of the output dcblocking
capacitors for reduced component count and
cost. The device is ideal for single-supply electronics
where size and cost are critical design parameters.
Designed using TI’s patented DirectPath™
technology, The DRV632 is capable of driving 2 VRMS
into a 10-kΩ load with 3.3-V supply voltage. The
device has differential inputs and uses external gainsetting
resistors to support a gain range of ±1 V/V to
±10 V/V, and gain can be configured individually for
each channel. Line outputs have ±8-kV IEC ESD
protection, requiring just a simple resistor-capacitor
ESD protection circuit. The DRV632 has built-in
active-mute control for pop-free audio on/off control.
The DRV632 has an external undervoltage detector
that mutes the output when the power supply is
removed, ensuring a pop-free shutdown.
Using the DRV632 in audio products can reduce
component count considerably compared to
traditional methods of generating a 2-VRMS output.
The DRV632 does not require a power supply greater
than 3.3 V to generate its 5.6-Vpp output, nor does it
require a split-rail power supply. The DRV632
integrates its own charge pump to generate a
negative supply rail that provides a clean, pop-free
ground-biased 2-VRMS output.
The DRV632 is available in a 14-pin TSSOP.