The TPA6136A2 (sometimes referred to as TPA6136) is a DirectPath™ stereo headphone amplifier that eliminates the need for external dc-blocking output capacitors. Differential stereo inputs and built-in resistors set the device gain, further reducing external component count. Gain is selectable at 0 dB or 6 dB. The amplifier drives 25 mW into 16 speakers from a single 2.3 V supply. The TPA6136A2 (TPA6136) provides a constant maximum output power independent of the supply voltage, thus facilitating the design for prevention of acoustic shock.
The TPA6136A2 (TPA6136) features fully differential inputs with an integrated low pass filter to reduce system noise pickup between the audio source and the headphone amplifier and to reduce DAC out-of-band noise. The high power supply noise rejection performance and differential architecture provides increased RF noise immunity. For single-ended input signals, connect INL+ and INR+ to ground.
The device has built-in pop suppression circuitry to completely eliminate disturbing pop noise during turn-on and turn-off. The amplifier outputs have short-circuit and thermal-overload protection along with ±8 kV HBM ESD protection, simplifying end equipment compliance to the IEC 61000-4-2 ESD standard.
The TPA6136A2 (TPA6136) operates from a single 2.3 V to 5.5 V supply with 2.1 mA of typical supply current. Shutdown mode reduces supply current to less than 1 µA.
Patented DirectPath Technology Eliminates Need for DC-Blocking Capacitors
Outputs Biased at 0 V
Excellent Low Frequency Fidelity
Active Click and Pop Suppression
HI-Z Output Mode Allows Sharing Output Jack
2.1 mA Typical Supply Current
Fully Differential Inputs Reduce System Noise
Also Configurable as Single-Ended Inputs
SGND Pin Eliminates Ground Loop Noise
Constant Maximum Output Power from 2.3 V to 5.5 V Supply
Simplifies Design to Prevent Acoustic Shock
MicrosoftTM Windows VistaTM Compliant
100 dB Power Supply Noise Rejection
Wide Power Supply Range: 2.3 V to 5.5 V
Gain Settings: 0 dB and 6 dB
Short-Circuit and Thermal-Overload Protection
±8 kV HBM ESD Protected Outputs
Small Package Available
16-Ball, 1.6 x 1.6 mm, 0.4 mm Pitch WCSP
APPLICATIONS
Smart Phones / Cellular Phones
Portable Media / MP3 Players
Notebook Computers
Portable Gaming
DirectPath is a trademark of Texas Instruments.
Windows Vista is a trademark of Microsoft Corporation.
