Texas Instruments TLV320AIC33IZXH

Overview

TLV320AIC33 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 for portable telephony and audio systems. It supports 8–96 kHz sampling rates, 16/20/24/32-bit data formats, and operates from 2.7–3.6 V analog supply.

For engineers reviewing the TLV320AIC33 datasheet, TLV320AIC33 pinout, TLV320AIC33 application, or TLV320AIC33 equivalent, key selection considerations include its dual-supply architecture (AVDD/DRVDD/DVDD/IOVDD), QFN-48 package thermal pad grounding requirement, I²C/SPI control bus selectability, and capless headphone driver capability enabling compact battery-powered designs.

Technical Context

The TLV320AIC33 implements delta-sigma modulation in both ADC and DAC paths, with digital interpolation and decimation filters supporting A-weighted SNR of 100 dB (DAC) and 92 dB (ADC) at 48 kHz. Its programmable PLL accepts MCLK inputs from 512 kHz to 50 MHz, generating precise audio clocks for I²S, left/right-justified, DSP, or TDM serial audio interfaces.

Audio routing is fully configurable via register-based mix/mux: ten analog input pins (MIC1/LINE1, MIC2/LINE2, MIC3/LINE3) support single-ended or differential configurations with up to +59.5 dB PGA gain in 0.5 dB steps; seven output drivers include four high-power (BTL speaker/headphone) and three fully differential line outputs, all with independent volume control and effects processing (3D, EQ, de-emphasis).

Key Specifications

Pinout & Package

The TLV320AIC33 is packaged in a 7 × 7 mm, 48-lead QFN (RGZ) with exposed thermal pad connected to DRVSS. Pin functions are validated per TI SLAS480B datasheet (Rev. December 2008), with all terminal assignments confirmed for the QFN-48 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV320AIC33, TLV320AIC32IRHBT offers lower quiescent power but sacrifices input flexibility and mono output capability, while PCM3060PWR delivers superior SNR at the cost of integration and portability-making TLV320AIC33 the balanced choice for battery-powered multi-function audio systems.

Availability

TLV320AIC33 is available at Aetrix Electronics and suitable for smartphone voice subsystems, portable media players, VoIP handsets, and industrial PDAs requiring stable component supply and long-term lifecycle support.

Supply support for TLV320AIC33 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 and embedded processing technologies, with decades of expertise in precision audio signal chains and low-power system solutions.

The TLV320AIC33 belongs to TI's portable audio codec product line, designed specifically to integrate high-fidelity audio conversion, programmable effects, and ultra-low-power operation into space- and battery-constrained mobile devices.

FAQ

What is the minimum analog supply voltage required for TLV320AIC33 operation?

The TLV320AIC33 requires an analog supply voltage (AVDD and DRVDD) between 2.7 V and 3.6 V. Operation below 2.7 V is outside specification and may result in degraded SNR, failed register access, or unstable PLL lock. The device is not guaranteed functional at 2.6 V or lower, even if initial power-up appears successful.

Does TLV320AIC33 support digital microphone inputs?

Yes, TLV320AIC33 supports digital microphone inputs via GPIO2 (pin 34), which functions as a digital microphone data input. This capability is documented in the Terminal Functions table and enables direct connection of PDM microphones without external decimation circuitry.

Can TLV320AIC33 drive 32-Ωheadphones directly?

Yes, TLV320AIC33 can drive 32-Ωheadphones directly in AC-coupled configuration, delivering up to 15 mW per channel with 94-dBA SNR. The headphone driver supports programmable output level control (0–9 dB gain in 1 dB steps) and common-mode voltage selection (1.35–1.8 V) to optimize performance across load impedances.

What clock frequencies does the TLV320AIC33 PLL support?

The TLV320AIC33 PLL supports MCLK inputs from 512 kHz to 50 MHz and generates precise audio clocks for standard sample rates (8–96 kHz). It is optimized for popular system clocks including 12 MHz, 13 MHz, 16 MHz, 19.2 MHz, and 19.68 MHz, with internal dividers and multipliers ensuring jitter performance compliant with audio requirements.

Is hardware reset mandatory for TLV320AIC33 initialization?

Yes, a hardware reset via the RESETB pin is mandatory. After all supplies reach specification, RESETB must be pulsed low for ≥10 ns. Without this sequence, register reads/writes may fail or return undefined values, and the internal state machine will not initialize correctly-even if SPI/I²C communication appears responsive.