Texas Instruments TLV320AIC33IZXHR

Overview

TLV320AIC33IZXHR from Texas Instruments is a low-power stereo audio codec IC with integrated 100-dBA DAC, 92-dBA ADC, stereo headphone amplifier (500 mW/channel into 8 Ω), and programmable microphone bias. It supports 8–96 kHz sampling rates, I²S/PCM/TDM audio serial interface, and SPI/I²C control bus - deployed in battery-powered portable audio and telephony systems including smartphones and PDAs.

For engineers reviewing the TLV320AIC33IZXHR datasheet, TLV320AIC33IZXHR pinout, TLV320AIC33IZXHR application, or TLV320AIC33IZXHR equivalent, key selection criteria include its 14-mW 48-kHz stereo playback power, 7×7 mm 48-QFN package, 10 analog input pins with AGC, differential line outputs, and capless headphone drive capability.

Technical Context

The TLV320AIC33IZXHR implements delta-sigma modulation for both ADC and DAC paths, with digital interpolation and decimation filters supporting 8–96 kHz sample rates. Its programmable PLL accepts MCLK inputs from 512 kHz to 50 MHz and generates precise audio clocks for I²S, left/right-justified, DSP, or TDM modes.

Audio signal routing is fully configurable via register-based mix/mux: ten analog inputs (MIC/LINE) can be routed to stereo ADC with up to +59.5 dB PGA gain in 0.5-dB steps; DAC output feeds seven output drivers - four high-power (BTL speaker/headphone) and three fully differential line drivers - each with independent volume control and effects processing (3D, bass, treble, EQ, de-emphasis).

Key Specifications

Pinout & Package

TLV320AIC33IZXHR is housed in a 7 × 7 mm, 48-lead QFN package with exposed thermal pad connected to DRVSS. The package supports fine-pitch PCB assembly and efficient heat dissipation in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV320AIC33IZXHR, TLV320AIC3101IRGZR offers lower system power but sacrifices speaker drive and feature depth, while WM8960EG/V provides competitive audio specs but demands additional support circuitry and lacks on-chip AGC/effects - making TLV320AIC33IZXHR optimal for integrated, feature-rich portable audio with minimal BOM count.

Availability

TLV320AIC33IZXHR is available at Aetrix Electronics and suitable for smartphone voice subsystems, portable media player audio front-ends, and industrial handheld terminal designs requiring stable component supply, long-term lifecycle support, and consistent electrical performance across production batches.

Supply support for TLV320AIC33IZXHR 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 and low-power system solutions.

The TLV320AIC33 product line targets portable battery-operated audio systems, delivering highly integrated, power-optimized codecs that reduce external component count while maintaining studio-grade audio fidelity.

FAQ

What is the minimum required hardware reset pulse width for TLV320AIC33IZXHR?

The TLV320AIC33IZXHR requires an active-low RESETB pulse of at least 10 nanoseconds after all power supplies reach their specified operating ranges. This ensures proper internal state machine initialization and register default loading. Failure to meet this timing may result in unpredictable I²C/SPI communication or incorrect audio path configuration. Always verify power rail sequencing before asserting RESETB in your TLV320AIC33IZXHR design.

Does TLV320AIC33IZXHR support capless headphone output?

Yes, TLV320AIC33IZXHR supports capless (DC-coupled) headphone output using its high-power drivers (HPLOUT/HPRCOM). This configuration requires setting the output common-mode voltage to 1.50 V or higher and disabling AC-coupling capacitors - reducing BOM cost and PCB area. The device specifies 30 mW maximum output power into 16 Ω in capless mode, with THD+N maintained below 0.028% at 20 mW.

Can TLV320AIC33IZXHR drive 8-Ω speakers directly?

Yes, TLV320AIC33IZXHR can drive 8-Ω speakers directly in bridge-tied-load (BTL) configuration using its high-power output drivers (e.g., HPLOUT + HPLCOM), delivering up to 500 mW per channel at 48 kHz. This eliminates the need for an external Class-D amplifier in compact portable designs. Thermal derating must be observed above 75°C ambient, with QFN package θJA = 38.5°C/W.

What audio serial data formats does TLV320AIC33IZXHR support?

TLV320AIC33IZXHR supports I²S, left-justified, right-justified, DSP, and TDM audio serial data formats on its primary audio bus (DIN/DOUT/BCLK/WCLK). Format selection is register-programmable and independent of the control bus (SPI/I²C). TDM mode supports up to 16 slots, enabling multi-channel audio routing in conferencing or multi-mic array applications using TLV320AIC33IZXHR.

Is microphone bias voltage programmable on TLV320AIC33IZXHR?

Yes, TLV320AIC33IZXHR provides a programmable MICBIAS output with four selectable levels: 2.0 V, 2.25 V, 2.5 V, and 2.75 V - set via register control. This allows optimal biasing for electret condenser microphones with varying impedance and sensitivity, eliminating the need for external bias resistors or regulators. The MICBIAS pin sources up to 4 mA at 2.5 V setting.