Packaging information
| Package | Pins TSSOP (PW) | 14 |
| Operating temperature range (°C) -40 to 85 |
| Package qty | Carrier 2,000 | LARGE T&R |
Features for the TPA6138A2
- Stereo DirectPath™ Headphone Amplifier
- 40 mW Into 32 Ω With 3.3-V Supply
- Low THD+N < 0.01% at 10 mW Into 32 Ω
- High SNR, >90 dB
- Differential Input and Single-Ended Output
- Adjustable Gain by External Gain-Setting
Resistors - Configurable as a Second-Order Low-Pass Filter
- Ideal for PWM Audio Sources
- Low DC Offset, <1 mV
- Ground-Referenced Outputs Eliminate DC-
Blocking Capacitors- Reduce Board Area
- Reduce Component Cost
- Improve THD+N Performance
- No Degradation of Low-Frequency Response
Due to Output Capacitors
- Short-Circuit Protection
- Click- and Pop-Reduction Circuitry
- External Undervoltage Mute
- Active Mute Control for Pop-Free Audio On/Off
Control - Space-Saving TSSOP Package
Description for the TPA6138A2
The TPA6138A2 is a pop-free stereo headphone amplifier designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single-supply electronics where size and cost are critical design parameters.
Designed using TI’s patented DirectPath™ technology, The TPA6138A2 is capable of driving 25 mW into a 32-Ω load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors that supports a gain range of ±1 V/V to ±10 V/V. Gain can be configured individually for each channel. The device can also be configured as a second-order low-pass filter and is ideal for interfacing with PWM audio sources. Audio output compiles with ±8-kV IEC ESD protection, requiring just a simple resistor-capacitor ESD protection circuit. The TPA6138A2 has built-in active-mute control for pop-free audio on/off control. The TPA6138A2 has an external undervoltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown.
Using the TPA6138A2 in audio products can reduce component count considerably compared to traditional headphone amplifiers. The TPA6138A2 does not require a split-rail power supply or a dc blocking capacitor. The TPA6138A2 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground-biased audio signal.
The TPA6138A2 is available in a 14-pin TSSOP.