Click and Pop

Suppression

Short-Circuit

Protection

GND

Bias

Circuitry

VSS

CN

CP

VDD

–INR

+INR

OUTL

–INL

OUTR

+INL

Mute

GND

UVP

Line

Driver

Line

Driver

8

DRV632

SLOS681C – JANUARY 2011 – REVISED AUGUST 2019

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Product Folder Links: DRV632

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Copyright © 2011–2019, Texas Instruments Incorporated

9 Detailed Description

9.1 Overview

Combining the TI's patented DirectPath technology with the built-in click and pop reduction circuit, the DRV632 is

a 2-VRMS pop-free stereo line driver designed to avoid the use of the output DC-blocking capacitors, resulting in

reduced component count and cost. The DRV632 is capable of driving 2-VRMS into a line load of 600 Ω to 10

kΩ with a 3.3-V supply voltage. The use of charge-pump flying, PVSS, and decoupling capacitors ensure the

performance of the amplifier. The device has two channels with differential inputs that require DC input-blocking

capacitors to block the DC portion of the audio source. These allow the DRV632 inputs to be properly biased to

provide maximum performance. The DRV632 allows external gain-setting resistors to support a gain range of ±1

V/V to ±10 V/V. The gain can be configured individually for each channel. Additionally, both channels can be

used as a second-order filter when the removal of out-of-band noise is required. The DRV632 has a built-in

active-mute control for pop-free audio on/off, and avoids the click and pop generation by using external

undervoltage detection. The device does not generate a pop or click when the power supply is removed or

placed.

9.2 Functional Block Diagram