TPA6130A2_17 Datasheet, PDF (14/39 Pages) Texas Instruments – 138-mW DIRECTPATH Stereo Headphone Amplifier with I2C Volume Control

TPA6130A2
SLOS488F – NOVEMBER 2006 – REVISED MARCH 2015
8 Detailed Description
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8.1 Overview
Headphone channels are independently enabled and muted. The I²C interface controls channel gain, device
modes, and charge pump activation. The charge pump generates a negative supply voltage for the output
amplifiers. This allows a 0 V bias at the outputs, eliminating the need for bulky output capacitors. The thermal
block detects faults and shuts down the device before damage occurs. The I²C register records thermal fault
conditions. The current limit block prevents the output current from getting high enough to damage the device.
The De-Pop block eliminates audible pops during power-up, power-down, and amplifier enable and disable
events.
8.2 Functional Block Diagram
LEFTINM
LEFTINP
Gain
Control
Left
De-Pop
HPLEFT
RIGHTINM
RIGHTINP
CPP
CPN
CPVSS
Right
Thermal
Current
Limit
Charge
Pump
Power
Management
I2C Interface
and Control
HPRIGHT
SD
SDA
SCL
VDD GND VDD GND
14
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