Product Overview
The TPA6132A2RTET is a 25-mW DirectPath™ stereo headphone amplifier from Texas Instruments featuring patented technology that eliminates the need for output DC-blocking capacitors. Packaged in a compact 16-pin WQFN (RTE) package measuring 3 mm × 3 mm, this device delivers 25 mW per channel into 16 Ω headphones from a single 2.3 V supply while maintaining excellent audio quality and low power consumption.
The TPA6132A2 features fully differential inputs with built-in gain-setting resistors, reducing external component count and improving system noise performance. Four selectable gain settings (–6 dB, 0 dB, 3 dB, 6 dB) are controlled via two logic pins (G0, G1). The device’s patented charge pump architecture generates an internal negative supply, allowing the output to be biased at 0 V for true DC-coupled operation with exceptional low-frequency fidelity.
Active click-and-pop suppression circuitry eliminates audible artifacts during power-up and power-down sequences. The device includes short-circuit and thermal-overload protection, plus ±8 kV HBM ESD protection on the output pins, simplifying compliance with IEC 61000-4-2 ESD standards. With a 2.1 mA typical supply current and shutdown mode consuming less than 1 µA, the TPA6132A2RTET is optimized for portable audio applications.
Key Specifications
| Parameter | Value |
|---|---|
| Output Power per Channel | 25 mW into 16 Ω @ 2.3 V supply |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Supply Current | 2.1 mA typical (operating) |
| Shutdown Current | Less than 1 µA |
| Gain Settings | –6 dB, 0 dB, 3 dB, 6 dB (pin-selectable) |
| Output Offset Voltage | ±0.5 mV maximum |
| PSRR | 100 dB at 217 Hz, 90 dB at 10 kHz |
| THD+N | Low distortion (DirectPath architecture) |
| Input Type | Fully differential or single-ended |
| Output Type | 0V biased, no DC-blocking cap needed |
| ESD Protection | ±8 kV HBM (output pins) |
| Package | WQFN-16 (RTE), 3×3 mm |
| Operating Temperature | –40°C to 85°C |
Features
- Patented DirectPath™ technology eliminates output DC-blocking capacitors
- Outputs biased at 0 V for excellent low-frequency fidelity
- Active click and pop suppression circuitry
- 25 mW per channel into 16 Ω @ 2.3 V supply
- Constant maximum output power across 2.3 V to 5.5 V supply range
- Simplifies design to prevent acoustic shock
- Fully differential or single-ended input capability
- Built-in resistors reduce external component count
- Four selectable gain settings: –6 dB, 0 dB, 3 dB, 6 dB
- High power supply rejection ratio: 100 dB at 217 Hz
- Improved RF noise immunity
- Microsoft Windows Vista™ compliant
- Short-circuit and thermal-overload protection
- ±8 kV HBM ESD protection on outputs
- 2.1 mA typical supply current, <1 µA shutdown
- Compact 16-pin WQFN package (3 mm × 3 mm)
Applications
- Smartphones and feature phones
- Tablets and e-readers
- Portable media players (PMP)
- Laptop and notebook computers
- Bluetooth audio devices and headsets
- Portable gaming devices
- Headphone amplifiers and DACs
- Digital audio players and recorders