1FEATURES

23· 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

DESCRIPTION

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 Ω 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 mA.