Texas Instruments TLV320AIC26IRHBG4

Overview

TLV320AIC26IRHBG4 from Texas Instruments is a low-power, high-performance stereo audio codec IC with 97-dBA DAC SNR, mono 80–92-dBA ADC SNR, and integrated 325-mW 8-Ω speaker driver. It supports up to 48 ksps sampling, programmable digital audio processing (bass/treble/EQ/de-emphasis), and operates from 2.7-V to 3.6-V analog supplies. It targets portable audio systems requiring compact, battery-efficient audio I/O with integrated power measurement and temperature sensing.

For engineers reviewing the TLV320AIC26IRHBG4 datasheet, TLV320AIC26IRHBG4 pinout, TLV320AIC26IRHBG4 application, or TLV320AIC26IRHBG4 equivalent, key selection considerations include its dual-mode audio interface (I²S/DSP/Left/Right-justified), on-chip PLL for flexible clock generation, capless headphone output capability, hardware AGC for microphone input, and integrated 12-bit auxiliary ADC with ±1 µA leakage on battery monitor inputs.

Technical Context

The TLV320AIC26IRHBG4 implements a sigma-delta stereo DAC and mono sigma-delta ADC with decimation/interpolation filtering, supporting independent sampling rates up to 48 ksps. Its digital audio interface operates in master or slave mode across I²S, DSP, left-justified, and right-justified formats with 16/20/24/32-bit word lengths.

It integrates an on-chip PLL accepting 2–50 MHz MCLK to generate precise Fsref (39–53 kHz), enabling fine-grained DAC/ADC rate division (N1/N2 = 1, 1.5, 2, ..., 6). The analog front end includes a 0–59.5 dB PGA with soft-stepping volume control, 2-V/2.5-V programmable MICBIAS, and differential/single-ended microphone input configuration.

Key Specifications

Pinout & Package

TLV320AIC26IRHBG4 uses a 32-pin QFN (5 mm × 5 mm, RHB package) with exposed thermal pad. Pin functions are validated per TI SLAS412 datasheet (December 2003), including dedicated audio, SPI, power, and monitoring terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV320AIC26IRHBG4, TLV320AIC3106IRHBT trades speaker drive and monitoring for lower quiescent current, while WM8731CSEFL/V requires more external components but offers higher DAC linearity at lower cost in non-battery applications.

Availability

TLV320AIC26IRHBG4 is available at Aetrix Electronics and suitable for cellular handsets, MP3 players, digital still cameras, and digital video camcorders requiring stable component supply and long-term industrial availability.

Supply support for TLV320AIC26IRHBG4 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and signal chain solutions.

The TLV320AIC26IRHBG4 belongs to TI's portable audio codec product line, designed specifically for battery-powered consumer electronics requiring integrated audio I/O, power monitoring, and minimal external components.

FAQ

What is the maximum sampling rate supported by the TLV320AIC26IRHBG4 for simultaneous DAC and ADC operation?

The TLV320AIC26IRHBG4 supports up to 48 ksps for both DAC and ADC simultaneously. It also allows independent sampling rates-e.g., DAC at 48 ksps while ADC runs at 44.1 ksps-via register-configurable N1/N2 dividers from a common Fsref (39–53 kHz), as defined in Control Register 00H/Page2 of the TLV320AIC26IRHBG4 datasheet.

Does the TLV320AIC26IRHBG4 support capless headphone output, and how is it implemented?

Yes, the TLV320AIC26IRHBG4 supports capless headphone output using its dedicated VGND pin (Pin 23), which delivers a stable virtual ground reference. When enabled via D8 of REG−05H/Page2, VGND allows HPL/HPR outputs to drive 16-Ω headphones without ac-coupling capacitors-reducing BOM cost and PCB footprint. This feature is validated for >30 mW/channel output power.

What are the voltage limits and accuracy specifications for the battery monitoring inputs on the TLV320AIC26IRHBG4?

The TLV320AIC26IRHBG4 battery monitor inputs (VBAT1 and VBAT2, Pins 13 and 12) accept 0.5–6.0 V with ±1 µA input leakage current. They interface with the internal 12-bit SAR ADC using the on-chip 2.5-V reference, achieving ±6 LSB integral nonlinearity and ±6 LSB gain error-enabling accurate state-of-charge estimation for single/dual Li-ion battery configurations.

Can the TLV320AIC26IRHBG4 operate without an external crystal, and what clock sources does it support?

Yes, the TLV320AIC26IRHBG4 can operate without an external crystal by using its on-chip oscillator (nominally 8 MHz) or by accepting an external MCLK from 2 MHz to 50 MHz. Its integrated PLL supports precise Fsref generation (39–53 kHz) from any MCLK within that range, enabling robust clocking from oscillators, SoC clocks, or crystal-less USB audio sources.

How does the hardware automatic gain control (AGC) function in the TLV320AIC26IRHBG4 microphone path?

The TLV320AIC26IRHBG4 implements hardware AGC via its programmable gain amplifier (PGA), which adjusts gain from 0 to 59.5 dB in 0.5-dB steps based on input signal level. Gain changes use soft-stepping (one step per 1–2 samples) to prevent audible artifacts. AGC is fully autonomous-no host processor intervention required-and defaults to mute on reset, ensuring silent startup.