Texas Instruments TLV320AIC31IRHBR

Overview

TLV320AIC31IRHBR from Texas Instruments is a low-power stereo audio codec IC integrating stereo 24-bit delta-sigma DAC (100-dB A-weighted SNR), stereo ADC (92-dB A-weighted SNR), programmable microphone bias, AGC, and four high-power output drivers capable of 500 mW/channel into 8-Ω speakers in BTL mode. It operates from 2.7–3.6 V analog, 1.65–1.95 V core, and 1.1–3.6 V I/O supplies, targeting portable audio/telephony systems with strict power and space constraints.

For engineers reviewing the TLV320AIC31IRHBR datasheet, TLV320AIC31IRHBR pinout, TLV320AIC31IRHBR application, or TLV320AIC31IRHBR equivalent, key selection considerations include its 32-pin QFN package, I²C control interface, support for I²S/DSP/TDM audio serial formats, 8–96 kHz sampling rates, and integrated headphone/speaker driver architecture requiring no external amplifiers in compact handheld designs.

Technical Context

The TLV320AIC31IRHBR implements dual delta-sigma modulation paths: a stereo DAC with programmable digital filters (3D/bass/treble/EQ/de-emphasis) and a stereo ADC preceded by two independent PGAs offering up to +59.5 dB gain in 0.5-dB steps. Its clocking subsystem includes a highly programmable PLL accepting MCLK inputs from 512 kHz to 50 MHz to generate precise audio sample clocks.

Signal routing is fully configurable via register-based mix/mux logic: six analog inputs (including differential mic inputs with programmable MICBIAS) feed into ADC paths, while DAC outputs and selected analog inputs are mixed and routed through volume-controlled paths to four high-power drivers (HPLOUT/HPLCOM/HPROUT/HPRCOM) and two fully differential line outputs (LEFT_LOP/LEFT_LOM/RIGHT_LOP/RIGHT_LOM).

Key Specifications

Pinout & Package

The TLV320AIC31IRHBR is housed in a 5-mm × 5-mm, 32-pin QFN package with exposed thermal pad (RHB suffix), optimized for compact portable PCB layouts and thermal dissipation in space-constrained audio subsystems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo audio codec applications.

Compared with TLV320AIC31IRHBR, TLV320AIC32IRHBR offers higher fidelity and enhanced capless drive reliability, while WM8960GEFL/V provides reduced power and simplified software integration at the expense of programmability and SNR margin.

Availability

TLV320AIC31IRHBR is available at Aetrix Electronics and suitable for smartphone audio subsystems, portable VoIP handsets, wireless headphone dongles, and industrial handheld terminals requiring stable component supply across production lifecycles.

Supply support for TLV320AIC31IRHBR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision audio signal chains.

The TLV320AIC31IRHBR belongs to TI's low-power audio codec product line, engineered specifically for space- and power-constrained portable electronics requiring integrated analog front-end, digital audio processing, and direct-drive output capability.

FAQ

What is the minimum master clock frequency supported by the TLV320AIC31IRHBR?

The TLV320AIC31IRHBR supports master clock (MCLK) frequencies from 512 kHz to 50 MHz. At the lower end, 512 kHz enables basic 8-kHz sampling rate operation with integer PLL division, making it suitable for narrowband telephony applications where ultra-low power and minimal clock source complexity are priorities. The device's flexible PLL ensures stable audio clocks across this full range.

Does the TLV320AIC31IRHBR support capless headphone output?

Yes, the TLV320AIC31IRHBR supports capless headphone output using its programmable common-mode voltage (1.35 V, 1.50 V, 1.65 V, or 1.80 V) on HPLCOM and HPRCOM pins. This eliminates the need for large DC-blocking capacitors in 16-Ω headphone paths, reducing PCB area and BOM cost. Performance is verified at 30 mW into 16 Ω with <0.016% THD+N.

What are the power supply requirements for the TLV320AIC31IRHBR analog section?

The TLV320AIC31IRHBR requires three independent supply domains: analog supply (AVDD) from 2.7 V to 3.6 V for the DAC and associated circuitry; analog driver supply (DRVDD) from 2.7 V to 3.6 V for headphone/speaker drivers; and analog ADC ground (AVSS1/AVSS2) and driver ground (DRVSS) referenced to 0 V. Proper decoupling with 0.1 µF and 0.47 µF capacitors per supply is mandatory per the datasheet.

How does the automatic gain control (AGC) function in the TLV320AIC31IRHBR?

The TLV320AIC31IRHBR implements AGC by dynamically adjusting the programmable gain amplifier (PGA) in the ADC path-spanning 0 to +59.5 dB in 0.5-dB steps-based on input signal level. It monitors peak amplitude and applies gain changes with configurable attack/release times to prevent clipping while maintaining speech intelligibility, especially useful for variable-distance microphone use in VoIP or conferencing devices.

Is the TLV320AIC31IRHBR pin-compatible with other members of the TLV320AIC3x family?

The TLV320AIC31IRHBR shares the same 32-pin QFN (RHB) package and pinout with TLV320AIC32IRHBR and TLV320AIC33IRHBR, enabling hardware reuse across variants. However, register maps differ: TLV320AIC31IRHBR uses two pages (0 and 1), while later variants add page 2 for extended features. Firmware must be validated per device due to functional differences in digital effects and power control.