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Category: Audio Reference Designs

Digitally Tunable MDAC Based State Variable Filter Reference Design

This MDAC based state variable filter offers highly accurate digital tuning of gain: center/cut off frequency: and quality factor. This circuit provides three separate filter outputs: low pass: band pass: and high pass that can be accessed simultaneously.  This circuit is suitable for a broad range of applications requiring accurate digital filter tuning from audio to industrial and more!
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Direct Type/ Local Dimming (Conventional TV power + Boost + LED driver)

In this topology: the UCC28051 is a boost transition mode (TM) power factor corrector (PFC): which can rectify an AC input line voltage to 380V DC; the resonant LLC stage UCC25600 regulates the output to 24V/2A for an audio amplifier with feedback to the LLC controller: and 48V for the LED driver input. The flyback with UCC28610 in parallel generates 5V/3A for the system board and 5V/1A for…
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Envelope-Tracking Power Supply Reference Design for Audio Power Amplifiers

This envelope-tracking power reference design maintains helps extend battery life in a portable audio applications: such as Bluetooth or Wi-Fi speakers. The low-power step-down converter in the design features envelope-tracking capability to an audio power amplifier: maintaining high efficiency across the output voltage range. By adding an audio envelope signal to the FB pin of TI’s TPS61178…
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Envelope-Tracking Power Supply Reference Design for Audio Power Amplifiers with TPS61088

This reference design delivers an envelope-tracking power supply circuit for audio power amplifier (PA) with TPS61088. By adding an audio envelope signal to the FB pin: the TPS61088’s output voltage can change in accordance with the envelope of the audio signal. So the TPS61088 provides a dynamically changing supply voltage to the PA. Thus the PA can always keep high efficiency in the whole…
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ESI + LDC Inductive Linear Position Sensing Reference Design

Typical implementations of linear position measurements use expensive rare-earth magnets. To lower the overall system cost: this reference design describes the implementation of using the industry’s first inductance-to-digital converters (LDC) from TI for linear position sensing without the use of any expensive rare-earth magnets. This reference design also describes the implementation of the…
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Filtering and Signal Processing Reference Design using MSP430 FRAM Microcontroller

This reference design showcases the performance of the low-energy accelerator (LEA) on MSP430 FRAM microcontroller (MCUs) in performing advanced filtering and signal processing while maintaining ultra-low power on a 16-bit MCU. The LEA provides a boost of 13.8x over a traditional C implementation for a 256-point complex FFT. LEA also provides real-time FIR filtering performance at a high audio…
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Getting Power from Earphone Jack Reference Design

This design is for powering a small system attached to a smartphone audio jack.  The reference design includes a charge pump and a boost converter. The charge pump is used to filter AC input into a DC voltage and the ultra-low quiescent current boost converter TPS610981 is used to generate a stable 3.3V.
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Headphone Amplifier for Voltage-Output Audio DACs Reference Design

This reference design details a high-fidelity headphone amplifier circuit suitable for portable applications: such as smartphones and tablets. It uses an operational amplifier (op amp) with low power consumption and a very small package to convert a differential output voltage to a single-ended signal suitable for headphones. The design achieves -110.2dB THD+N at >50mW of output power into 32Ω…
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Headset Detection Switch to Detect 3-Pole or 4-Pole 3.5mm Accessories

This reference design is for autonomous audio headset switch applications. Some audio headsets have integrated analog microphones. The GND and MIC connections on the audio jack connector may be swapped depending on the manufacturer. This design has the ability to detect the presence of an analog microphone on the audio headset: detect the pin configuration of the MIC and Ground pins: and switch…
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High Fidelity 175W Class-D Audio Amplifier with Digital Inputs and Processing Reference Design

This design turns the extremely high performance analog input TPA3251 Class-D amplifier into a digital input system with audio processing using the highly versatile PCM5242 differential output DAC. Now the full performance of TPA3251 amplifier can be realized with a variety of digital input sources. The analog differential output and high SNR of the PCM5242 DAC is a perfect match to the fully…
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High Performance Capacitive Sensor Front-End Reference Design

The TIDA-00662 is a high performance capacitive sensor front-end reference design. With the usage of an audio codec including a programmable miniDSP functionality impedance measurement and change in phase detection is realized. The frequency-domain sensing front-end is for pressure and flow transmitters applications: as well as any other application with capacitive sensor elements.Click here for…
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Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC0851

An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt: moisture: or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.
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Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314

An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt: moisture: or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.
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MSP432™ MCU With MSP430™ Capacitive Touch MCU: Haptics: and LCD Reference Design

This reference design demonstrates how to interface an MSP430 MCU featuring CapTIvate technology with an MSP432 MCU host microcontroller using the CapTIvate Software Library communications module. The design integrates capacitive touch technology with haptics: an MSP432 MCU as host: driving a color QVGA LCD screen.
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Noise Tolerant Capacitive Touch HMI Reference Design

The Noise Tolerant Capacitive Touch HMI design (TIDM-CAPTOUCHEMCREF) is a reference design for implementing noise tolerant capacitive touch human-machine interfaces (HMIs).  It integrates TI's MSP430FR2633 microcontroller (MCU) featuring high performance CapTIvate touch technology with the TPS7A4533 linear regulator and UCC28910 flyback switcher.  This reference design demonstrates how to design…
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Off Line Power Supply for Audio Reference Design

Universal line input to + and -24 V DC output designed for audio applications. The supply uses a two switch fly back topology with a low cost LM5021 controller. The supply is designed to handle 150 watts peak power required by an audio amplifier but thermally designed for the lower average power common in audio applications.
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PCM1864-Based Circular Microphone Board (CMB) Reference Design

The PCM1864 circular microphone board (CMB) is a low-cost easy-to-use reference design for applications that require clear-spoken audio: such as voice triggering and speech recognition. This TI Design uses a microphone array to capture a voice signal: and converts it to a digital stream that can be used by DSP systems to extract clear audio from noisy environments.
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Portable Audio Amplifier with Auto Audio Control 1S1P BMS Reference Design

High performance: 10Watt (5W per speaker) portable audio amplifier that includes everything you need to implement a BMS (Battery Management Solution) for a portable audio amplifier (including a Charger: Fuel (Gas) Gauge and Protection for a 1S1P 18650 2400mAh Lithium battery) for a Class D Audio Amplifier. Get extended operating time by using efficient power regulators: Class D amplifier and…
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Power-optimized 16-bit 1MSPS Data Acquisition Block for Lowest Distortion and Noise Reference Design

This TI Verified Design is the realization of a high precision: 16-bit 1MSPS data acquisition system suitable for applications such as digital audio that require front-ends with very low distortion and noise. The circuit uses a high performance Successive Approximation Register Analog to Digital Converter (SAR ADC) and has been optimized to provide superior dynamic performance: without excessive…
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Public Announcement Audio Reference Design utilizing best in class Boost Controller

PMP10710 is a 200W design for public announcement audio system which can be used in 100W +100W Stereo or 200W Woofer Applications. The design is broadly divided into four main stages:Single-Phase Synchronous Boost Converter using the LM5122 controller IC.  The design accepts an input voltage of 10V to 15 VIN (12 VIN Nominal) and provides an output of 30V capable of supplying 6.5A of continuous…
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