DRV632 Datasheet, PDF (8/23 Pages) Texas Instruments – DirectPath™, 2-VRMS Audio Line Driver With Adjustable Gain

DRV632
SLOS681B – JANUARY 2011 – REVISED AUGUST 2015
9 Detailed Description
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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
+INL
–INL
Line
Driver
Line
Driver
+INR
–INR
OUTL
OUTR
GND
Mute
Click and Pop
Suppression
Short-Circuit
Protection
UVP
GND
VSS
CN
Bias
Circuitry
VDD
CP
8
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