Texas Instruments PCM3793ARHBT

Overview

PCM3793ARHBT from Texas Instruments is a 16-bit stereo audio CODEC with integrated Class-D digital speaker amplifier, headphone amplifier, microphone bias, analog mixing, and programmable tone control. It delivers 700 mW + 700 mW speaker output into 8 Ω, 40 mW + 40 mW headphone output into 16 Ω, and supports 5–50 kHz sampling rates. Designed for portable audio systems requiring low power (7 mW playback at 1.8 V/2.4 V), it operates from single 2.4–3.6 V analog and 1.71–3.6 V digital supplies.

For engineers reviewing the PCM3793ARHBT datasheet, PCM3793ARHBT pinout, PCM3793ARHBT application, or PCM3793ARHBT equivalent, key selection considerations include its dual-role analog/digital I/O architecture, BTL speaker output capability, register-controlled ALC and 3-band tone processing, and QFN-32 package compatibility with space-constrained handheld designs.

Technical Context

The PCM3793ARHBT integrates delta-sigma ADC and DAC with decimation/interpolation filters, configurable high-pass and dual notch filters, and digital signal path routing for ALC, 3D sound, and three-band tone control (bass/mid/treble). Its analog front end supports mono differential or stereo single-ended inputs with 0/20 dB microphone boost and 30 dB to –12 dB PGA gain per channel.

Control is implemented via 2-wire I²C or 3-wire SPI interface; register 74 configures headphone/line output mode (capless or capacitor-coupled), while registers 64–67 set analog volume (6 dB to –70 dB) and mute per channel. The device includes zero-cross detection for pop-noise reduction, thermal shutdown for speaker outputs, and short-circuit protection on all headphone drivers.

Key Specifications

Pinout & Package

PCM3793ARHBT is housed in a 5-mm × 5-mm, 32-pin QFN package (RHB) with exposed thermal pad. Pin functions are validated per TI SLES193C datasheet Rev. FEBRUARY 2007.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCM3793ARHBT, PCM3794ARHBT removes speaker functionality while retaining full CODEC feature parity, whereas TLV320AIC3106IRHBT trades speaker drive for lower power and enhanced headphone efficiency-making each suitable for distinct thermal, power, and integration requirements.

Availability

PCM3793ARHBT is available at Aetrix Electronics and suitable for portable audio player, cellular phone, video camcorder, and digital still camera applications requiring stable component supply and legacy design continuity.

Supply support for PCM3793ARHBT 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 digital signal technologies for industrial, automotive, and consumer markets.

The PCM3793 product line was engineered for portable digital audio systems needing integrated audio conversion, amplification, and signal conditioning in minimal footprint - targeting PMP, DMB, and mobile multimedia platforms.

FAQ

What is the primary function of the PCM3793ARHBT in an audio system?

The PCM3793ARHBT serves as a complete stereo audio CODEC with integrated Class-D speaker amplifier, headphone driver, microphone bias, analog mixing, and digital signal processing. In a typical implementation, PCM3793ARHBT handles ADC-based microphone recording with ALC, DAC-based stereo playback, and direct BTL drive to 8-Ω speakers - consolidating six discrete audio functions into one QFN-32 IC.

Does the PCM3793ARHBT support capless headphone output?

Yes, the PCM3793ARHBT supports capless headphone output via HPOL/LOL and HPOR/LOR pins. When configured using register 74 (HPS[2:0] = 0x3), the outputs operate in capless mode with internal DC bias at 0.5×VCC, eliminating external coupling capacitors. This reduces BOM count and PCB area - a critical advantage in ultra-thin portable designs where PCM3793ARHBT is commonly deployed.

How does the PCM3793ARHBT implement automatic level control (ALC) for microphone input?

The PCM3793ARHBT implements ALC through dedicated digital circuitry that monitors ADC output level and dynamically adjusts PGA gain in real time. Controlled by register 83, ALC parameters include expansion threshold, compression threshold, attack time (1–128 ms), and recovery time (1–1024 ms). During recording, PCM3793ARHBT applies this closed-loop gain control to maintain consistent signal amplitude without clipping - essential for reliable voice capture in variable acoustic environments.

What are the thermal protection mechanisms built into the PCM3793ARHBT?

The PCM3793ARHBT includes thermal shutdown for its Class-D speaker amplifier, which disables SPOLP/SPOLN/SPORP/SPORN outputs when junction temperature reaches ~150°C. It also features short-circuit protection on all headphone outputs (HPOL/HPOR), automatically powering down affected channels if shorted to VPA, PGND, or each other. These protections are monitored via status bits in register 77 (STHC, STHL, SCHR), enabling host firmware to respond to fault conditions - a core safety feature in battery-powered PCM3793ARHBT deployments.

Can the PCM3793ARHBT be used with both I²C and SPI control interfaces?

Yes, the PCM3793ARHBT supports both 2-wire I²C and 3-wire SPI serial control interfaces. Interface selection is determined by the MODE pin: HIGH selects I²C (using MC/SCL and MD/SDA), LOW selects SPI (using MC/SCL as SCLK and MD/SDA as MOSI/MISO). All register access, configuration, and status reads/writes function identically across both protocols - giving designers flexibility to match host processor peripheral availability without modifying PCM3793ARHBT firmware logic.