Texas Instruments SN200608044

Overview

TAS5086 from Texas Instruments is a six-channel digital pulse-width modulation (PWM) audio processor designed for high-fidelity Class-D amplifier systems. It accepts 16-/20-/24-bit I2S, left-justified, or right-justified serial audio inputs at sampling rates from 32 kHz to 192 kHz, performs volume control (24 dB to –100 dB), bass management, and outputs six independent PWM channels with ≥105-dB dynamic range and THD < 0.06%. It is used in multi-channel home theater receivers and AV amplifiers requiring precise channel mapping and AM interference avoidance.

For engineers reviewing the TAS5086 datasheet, TAS5086 pinout, TAS5086 application, or TAS5086 equivalent, key selection considerations include its 38-pin TSSOP package, 1N+1 PWM interface compatibility with TAS5186/TAS5142, I2C slave-only control (100/400 kHz), 3.3-V single-supply operation, and support for intelligent AM interference avoidance via adjustable clock-rate shifting.

Technical Context

The TAS5086 operates as a clock-slave device requiring external MCLK, SCLK, and LRCLK; it supports 64-fS or 48-fS bit-clock rates and auto-detects input sample rates (32–192 kHz) using internal oscillator-based timing. Its PLL generates a 196-MHz core clock from MCLK or internal oscillator when MCLK is unstable.

It implements fourth-order noise shaping with 8× oversampling at 44.1/48 kHz, delivering flat 20-Hz–20-kHz noise floor and ≥105-dB SNR. Channel 6 includes two programmable biquad filters for subwoofer-specific bass management, and all six channels support individual DC-blocking filters and de-emphasis (32/44.1/48 kHz).

Key Specifications

Pinout & Package

Package: 38-pin TSSOP (DBT), 0.65-mm pitch, thermally enhanced with exposed thermal pad (not electrically connected). Requires 0.1-µF low-ESR ceramic decoupling on VR_ANA, VR_DIG, and VR_OSC pins referenced to respective ground planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar six-channel digital PWM processor applications.

Compared with TAS5086-Q1, the standard TAS5086 reduces cost and simplifies qualification for non-automotive applications, while TAS5087 delivers measurable SNR and programmability gains without altering layout - making both viable alternatives depending on environmental or performance requirements.

Availability

TAS5086 is available at Aetrix Electronics and suitable for home theater receivers, multi-channel AV amplifiers, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TAS5086 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, with decades of leadership in high-performance audio ICs.

The TAS5086 belongs to TI's PurePath Digital™ audio processor family, engineered specifically for high-efficiency, low-noise Class-D amplifier systems demanding precise PWM timing, flexible channel routing, and robust EMI mitigation.

FAQ

What is the primary function of the TAS5086 in an audio system?

The TAS5086 serves as a six-channel digital PWM processor that converts multi-format serial audio inputs (I2S, left/right-justified) into six synchronized PWM outputs for driving Class-D power stages. It handles volume control, bass management, channel mapping, de-emphasis, and AM interference avoidance - all within a single 3.3-V, 38-pin TSSOP device. The TAS5086 does not include power MOSFETs or analog amplification; it is strictly a digital modulator.

Does the TAS5086 require an external master clock, and what frequencies are supported?

Yes, the TAS5086 is a clock-slave device and requires external MCLK, SCLK, and LRCLK. MCLK supports 4 MHz to 50 MHz, with standard ratios of 128-, 192-, 256-, 384-, and 512-fS (e.g., 12.288 MHz for 48 kHz). For 176.4/192 kHz, a 64-fS MCLK (e.g., 12.288 MHz) is required. SCLK must be 48-fS or 64-fS; LRCLK matches the audio sample rate (32–192 kHz).

Can the TAS5086 drive power stages directly, and which devices are compatible?

Yes - the TAS5086 outputs six PWM signals in 1N+1 format and directly interfaces with TI's TAS5186 (6-channel BTL), TAS5142 (6-channel SE/BTL), TAS5111 (2-channel SE/BTL), and TAS5112 (2-channel BTL) without external glue logic. For TAS5112 BTL, one inverter per channel is required. The TAS5086 does not drive speakers directly; it must be paired with a compatible Class-D power stage.

How does the TAS5086 handle AM radio interference in audio systems?

The TAS5086 implements an Intelligent AM Interference Avoidance system that dynamically adjusts its internal PWM clock rate to 7-fS, 8-fS, or 9-fS - shifting switching energy away from the AM broadcast band (530–1710 kHz). This feature requires manual sample rate selection and disables automatic rate detection but eliminates audible AM desense without shielding or layout changes - validated in automotive and home receiver applications.

What are the power supply requirements for the TAS5086?

The TAS5086 operates from a single 3.3-V supply for both digital (DVDD) and analog (AVDD) domains. Internally generated 1.8-V references (VR_ANA, VR_DIG, VR_OSC) require 0.1-µF low-ESR ceramic capacitors to their respective ground planes (AVSS_PLL, DVSS_PWM, AVSS_PLL). No separate analog/digital supplies or negative rails are needed - simplifying board design and reducing BOM count.