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.