Texas Instruments TLV320AIC31IRHBTG4

Overview

TLV320AIC31IRHBTG4 from Texas Instruments is a low-power stereo audio codec IC integrating a 100-dB SNR DAC, 92-dB SNR ADC, programmable microphone bias (2.0–2.75 V), stereo 8-Ω speaker drivers (500 mW/channel), and I²C/I²S/PCM serial interfaces. It operates from 2.7–3.6 V analog, 1.65–1.95 V core, and 1.1–3.6 V I/O supplies in portable telephony and smartphone audio subsystems.

For engineers reviewing the TLV320AIC31IRHBTG4 datasheet, TLV320AIC31IRHBTG4 pinout, TLV320AIC31IRHBTG4 application, or TLV320AIC31IRHBTG4 equivalent, key selection factors include its 14-mW 48-kHz stereo playback power, 0.5-dB PGA step resolution, capless 16-Ω headphone drive capability, and QFN-32 package compatibility with space-constrained handheld designs.

Technical Context

The TLV320AIC31IRHBTG4 implements delta-sigma modulation for both ADC and DAC paths, supporting sample rates from 8 kHz to 96 kHz with A-weighted SNR of 92 dB (ADC) and 100 dB (DAC). Its digital audio effects engine provides configurable 3D enhancement, bass/treble/EQ, and de-emphasis filtering for 32/44.1/48 kHz rates.

Power management uses register-based modular control across analog, digital core, and I/O domains, enabling 0.1 µA deep power-down state. The integrated PLL accepts MCLK inputs from 512 kHz to 50 MHz-including 12/13/16/19.2/19.68 MHz-generating precise audio clocks without external crystal oscillators.

Key Specifications

Pinout & Package

TLV320AIC31IRHBTG4 is housed in a thermally enhanced 5 mm × 5 mm, 32-pin QFN package (RHB suffix) with exposed thermal pad. Pin 1 is marked by a dot; pins are numbered counter-clockwise starting from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV320AIC31IRHBTG4, TLV320AIC32IRHBT provides higher speaker output and SNR at increased power cost, while WM8960GEFL/V delivers better distortion performance but mandates full hardware revision-making TLV320AIC31IRHBTG4 optimal for cost-sensitive, space-constrained portable designs needing proven integration and minimal BOM impact.

Availability

TLV320AIC31IRHBTG4 is available at Aetrix Electronics and suitable for smartphone voice subsystems, portable media players, industrial handheld scanners, and Bluetooth headset baseband interfaces requiring stable component supply across long production lifecycles.

Supply support for TLV320AIC31IRHBTG4 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 over 50 years of innovation in precision signal chain solutions.

The TLV320AIC31IRHBTG4 belongs to TI's low-power audio codec product line, engineered specifically for battery-operated portable devices demanding high-fidelity audio, minimal power consumption, and compact integration of ADC/DAC, amplification, and digital audio processing.

FAQ

What is the minimum required hardware reset sequence for reliable TLV320AIC31IRHBTG4 initialization?

The TLV320AIC31IRHBTG4 requires a hardware reset pulse of at least 10 ns applied to the RESET pin after all power supplies (AVDD, DRVDD, DVDD, IOVDD) reach their specified operating ranges. Failure to perform this sequence may result in undefined register states and failure to respond to I²C commands. This reset must occur before any register access; TLV320AIC31IRHBTG4 does not support software-only initialization.

Does TLV320AIC31IRHBTG4 support capless headphone output, and what are the voltage requirements?

Yes, TLV320AIC31IRHBTG4 supports capless (DC-coupled) headphone output to 16-Ω loads using programmable common-mode voltage settings (1.35 V, 1.50 V, 1.65 V, or 1.80 V). This requires AVDD = DRVDD = 3.3 V ±10% and proper DC biasing of the HPLCOM/HPRCOM pins per register configuration. Capacitor-less operation eliminates two large electrolytic capacitors, reducing size and cost in space-constrained designs.

What audio serial interface formats does TLV320AIC31IRHBTG4 support, and how are they configured?

TLV320AIC31IRHBTG4 supports I²S, left-justified, right-justified, DSP, and TDM modes via register-controlled configuration of the audio serial data bus (DIN/DOUT/BCLK/WCLK). Mode selection is performed through the DIGIF register (page 0, address 0x0E); no hardware strapping is required. Clock polarity, data delay, and word length (16/20/24/32-bit) are independently programmable to match host processor requirements.

Can TLV320AIC31IRHBTG4 drive 8-Ω speakers directly, and what is the maximum output power per channel?

Yes, TLV320AIC31IRHBTG4 can drive 8-Ω speakers directly in bridged-tied-load (BTL) configuration using HPLOUT/HPLCOM and HPROUT/HPRCOM pairs. Each channel delivers up to 500 mW at 1% THD+N with AVDD = DRVDD = 3.3 V. Thermal derating applies above +75°C ambient; full output requires adequate PCB copper area and thermal pad soldering per TI's RHB package guidelines.

How does the programmable microphone bias (MICBIAS) function in TLV320AIC31IRHBTG4, and what are its valid settings?

TLV320AIC31IRHBTG4 provides four factory-trimmed MICBIAS output voltages: 2.0 V, 2.25 V, 2.5 V, and 2.75 V, selected via register bits (page 0, address 0x0C, bits 6–5). Each setting is guaranteed to source ≥4 mA into 750-Ω load with <±25 mV regulation error. Bias voltage tracks AVDD closely (see Figure 12), making it suitable for dual electret condenser microphones in headset applications.