on November 12th 87

Understanding the TDA7294 DMOS Audio Amplifier: Pinout, Datasheet, and Power Specs

The TDA7294 amplifier is a go-to choice for high-performance audio, known for its impressive 100V, 100W DMOS design that delivers exceptional sound quality. This article digs into its key features, from detailed pin configuration and power management to basic technical insights that unlock its full potential. With a well-planned layout, you can significantly reduce distortion and enhance performance. This guide explores the versatility of the TDA7294 across various audio applications—whether for Hi-Fi systems, car audio, or subwoofers—along with practical tips for circuit optimization and heat management. Discover why this amplifier IC remains a staple in the pursuit of high-fidelity sound.

Catalog

Pin Configuration

Pin No.	Pin Name	Pin Description
1	Stand-By GND	Stand-By GND, output gets connected to ground
2	Inverting input	The Inverting input
3	Non-Inverting input	The Non-Inverting input
4	SVR	Supply Voltage Rejection used for power supply ripple or noise rejection
5	N.C.	Not connected
6	Bootstrap	Used to step-up charge
7	'+Vs Supply	Positive supply
8	Negative supply	Negative supply
9	Stand-by	Standby control pin used for low power mode, output runs in low current mode
10	Mute	Audio is disabled for the output
11	N.C.	Not connected
12	N.C.	Not connected
13	'+Vs Power	Positive power supply
14	Out	Output pin
15	Negative power supply	Negative power supply

CAD Design

Symbol

Footprint

3D Model

TDA7294 Audio Amplifier Overview

The TDA7294 emerges as a remarkable entity within class AB audio amplification, encapsulated within the inventive Multiwatt15 package. It predominantly finds its place in environments demanding high-fidelity sound, such as sophisticated home audio systems and modern televisions.

Engineered for wide voltage adaptability, the TDA7294 embraces power input variations typical of many audio configurations. Its capacity for robust current handling ensures the delivery of substantial power output to either 4 or 8-ohm loads. This capability promotes consistent audio quality with the variability of electrical supply which can impact sonic experiences. The amplifier appeals to those who understand the subtleties of maintaining consistent performance amidst commonplace electrical instabilities.

The TDA7294 integrates an advanced muting function, providing a smooth, noise-free audio experience during power shifts. This aspect is mostly relevant in domestic and commercial environments, where unexpected audio interruptions can be jarring. You can value this aspect, as it aligns with everyday scenarios where silent operation is sought after amidst power transitions within audio systems.

Technical Specification

Here’s a table format for the technical specifications of the STMicroelectronics TDA7294V.

Specification	Detail
Type	Class AB
Parameter	Value
Lifecycle Status	Active (Last Updated: 6 months ago)
Factory Lead Time	6 Weeks
Mount	Through Hole
Mounting Type	Through Hole
Package / Case	Multiwatt-15 (Vertical, Bent and Staggered Leads)
Number of Pins	15
Weight	8.164663g
Manufacturer Package Identifier	Multiwatt-15
Operating Temperature	0°C ~ 70°C TA
Packaging	Tube
JESD-609 Code	e3
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	15
ECCN Code	EAR99
Terminal Finish	Tin (Sn)
Max Power Dissipation	50W
Voltage - Supply	±10V ~ 40V
Terminal Position	ZIG-ZAG
Number of Functions	1
Base Part Number	TDA7294
Pin Count	15
Output Type	1-Channel (Mono)
Number of Channels	1
Nominal Supply Current	30mA
Power Dissipation	50W
Output Current	10A
Quiescent Current	30mA
Output Power	100W
Output Current per Channel	10A
Supply Type	Dual
Input Offset Voltage (Vos)	10mV
Bandwidth	20 kHz
Voltage Gain	80dB
Power Supply Rejection Ratio (PSRR)	75dB
Gain	80 dB
Max Dual Supply Voltage	40V
Max Output Power	100W
Min Dual Supply Voltage	10V
Dual Supply Voltage	28V
Input Bias Current	500nA
Max Junction Temperature (Tj)	150°C
Max Output Power x Channels @ Load	100W x 1 @ 8 Ω
Ambient Temperature Range High	70°C
Harmonic Distortion	10%
Load Impedance	4 Ohm
Features	Depop, Mute, Short-Circuit and Thermal Protection, Standby
Dimensions (HxLxW)	21mm x 19.6mm x 5mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Functional Schematic

Features

Feature	Description
Very High Operating Voltage Range	±40V
Demos Power Stage	Optimized for power stage applications
High Output Power	Up to 100W music power
Muting/Stand-By Functions	Includes muting and standby capabilities
No Switch On/Off Noise	Eliminates audible noise during switching
No Boucherot Cells	Operates without external Boucherot cells
Very Low Distortion	Maintains audio fidelity
Very Low Noise	Ensures clean audio output
Short Circuit Protection	Protects against accidental short circuits
Thermal Shutdown	Prevents overheating

Power Dynamics of the TDA7294

The TDA7294 amplifier, celebrated for its resilient DMOS output stage, is crafted to provide a robust 100W RMS output to an 8-ohm speaker, utilizing a dual +/-38VDC power supply. This capability highlights its flexibility across varying voltage levels, ensuring that it consistently delivers high-quality audio performance even as the electrical circumstances change.

The amplifier's design enables it to operate effectively despite fluctuations in the power supply. Its strength originates from meticulous engineering that anticipates challenges, including variable power supply situations. By offering stable performance over a wide voltage range, it adeptly manages scenarios where power regulation might be suboptimal.

Instances where power supplies fall short of delivering ideal voltage are frequently encountered in practice. In these situations, the TDA7294's construction offers a substantial edge by upholding sound quality and performance. This trait is mostly valuable in settings with erratic power sources, such as remote installations or older infrastructures prone to instability.

Applications

Hi-Fi Audio Systems

Renowned in the world of high-fidelity audio, the TDA7294 is celebrated for producing sound that captures the distinctions of musical compositions with little distortion. In these systems, components are selected for their ability to maintain the clarity of audio across varying volumes and frequencies, preserving the delicate intricacies of music. You can focus on circuit optimization and find the integration of the TDA7294 needs attention and creativity. They fine-tune circuit designs to harmonize performance with efficiency, crafting an immersive experience that can inspire a deeper love for superior sound reproduction.

Car Audio

When it comes to car audio, the TDA7294 is a key player in elevating sound quality within a vehicle's confines. Its compact form and efficient power management make it well-suited for automotive setups where space and energy usage are limited. Proper installation practices, including accurate grounding and effective heat management, are vital in sustaining the system's sound quality and lifespan. You can have refined techniques emphasizing the placement of components and quality of wiring, both used for achieving impeccable audio as one navigates diverse road conditions.

Bridge Circuits

The TDA7294's adaptability shines in bridge circuits, where two amplifier channels pair to power a single load, thus amplifying the power output. This setup is advantageous in scenarios demanding increased power without forfeiting compactness. Adequate thermal management stands out, given the amplified power leading to higher temperatures. You can recommend effective cooling methods and appropriate component choices to uphold system dependability and durability.

Stereo Setups

Stereo systems thrive on the TDA7294’s proficiency in processing intricate audio signals while generating robust sound. Precision in balancing the output across various channels is dominant to avoid creating phasing or balance concerns that might diminish the sound experience. You can emphasize the importance of meticulous channel calibration, a skill honed through both notional learning and practical experience, emphasizing the synergy of technological precision and artistic flair useful for achieving audio excellence.

Subwoofers

Subwoofers, requiring ample power for delivering deep, low-frequency sounds, find an ideal companion in the TDA7294. Its capability to provide a strong current ensures bass reproduction remains distortion-free, laying the groundwork for powerful audio systems. Designing the subwoofer enclosure to work harmoniously with the amplifier's capabilities directly influences success. You can frequently draw lessons from their past projects to guide the design process, ensuring bass output is intended to be rich and resonant, not overpowering or unclear.

Comparative Examination of TDA7293 and TDA7294 Amplifier ICs

Dynamics and Distinctions

Both the TDA7293 and TDA7294 Integrated Circuits are proficient in converting signals rapidly at a rate of 10V/µs. This feature contributes to their adeptness in audio applications that are sensitive to timing and sound clarity. The TDA7293 distinguishes itself by accommodating a broader voltage spectrum, capable of operating up to a dual 50V DC supply, broadening its dynamic reach, and enhancing output power. Such attributes make it an attractive option for high-power audio amplifiers utilized in expansive venues or environments where powerful audio is a must.

Application-Based Decision-Making

Choosing between these two ICs often relies on tailoring to specific project nuances. The TDA7293 is favored by you focusing on projects necessitating high power without sacrificing audio integrity. Its proficiency in managing elevated voltages equates to superior sound quality and potency, making it apt for professional audio apparatus. Deploying the TDA7293 in settings with pronounced voltage variability has demonstrated effectiveness due to its admirable voltage resilience.

Extended Capabilities and Contextual Uses

The TDA7293's elevated voltage capacity results in greater output potential, sufficient for driving demanding speaker setups. This makes the IC frequently selected for systems requiring vast dynamic ranges, managing a spectrum of frequency and amplitude with accuracy. Conversely, the TDA7294 presents itself as a sound alternative for consumer-level audio devices, where moderate power levels meet expectations, achieving a balance between efficiency and quality.

Implementation of TDA7294 Amplifier Circuit

TDA7294 Circuit

Constructing an amplifier circuit with the TDA7294 involves an array of decisions and calculations, mostly when it comes to the meticulous selection and arrangement of resistors and capacitors. These choices are profoundly linked to how they affect the circuit's input resistance and gain, subsequently shaping the richness and clarity of the overall sound. Calculating the resistance and capacitance values needed for specific parameters like input sensitivity and bandwidth can be a worthwhile endeavor. Subtle alterations in these components might intensely transform the auditory output, highlighting the apparent need for precision.

• Input Resistance: Input resistance plays a remarkable role, as it dictates how adeptly the amplifier can process signals from diverse sources. Matching the amplifier's input impedance with the source equipment's output impedance is the ultimate for minimize signal loss and maximize power transfer. Experimenting with various resistor values in prototype circuits can provide invaluable insights into the distinctions of signal dynamics.

• Gain Control: Adjusting the amplifier's gain demands consideration of the application's context, involving a balancing act between amplification power and signal purity. Through practical experimentation, it becomes possible to fine-tune gain settings, thereby enhancing audio crispness without sacrificing volume. Thoughtful adjustment of gain serves to keep distortion levels negligible, enriching the auditory experience.

• Standby Duration and Mute Timing: Configuring the standby duration and mute timing with precision is useful for ensuring a pleasant experience and effectively suppressing noise. Incorporating suitable capacitors can facilitate smooth transitions between operational states, mitigating unwanted auditory pops and clicks during activation and deactivation. Direct experimentation can unveil optimal capacitor values for achieving fluid operational transitions.

Equivalents

• NTE7165

Alternatives

• TDA7293

• TDA7295

• LM3886

Dimensions

Manufacturer

The TDA7294, crafted by the skilled hands at STMicroelectronics, serves as a bright reflection of the company's rich history and achievements since its inception in 1988. STMicroelectronics has cultivated a distinguished reputation in the dominion of analog and power management ICs, extending its innovative reach to diverse fields such as consumer electronics and automotive applications. This particular component embodies the company's unwavering pursuit of innovation and quality.

The TDA7294 is a shining example of STMicroelectronics' expertise, featuring a host of impressive attributes tailored to meet the dynamic demands of different sectors. This masterpiece is engineered to produce high-power audio output with minimal distortion, promising crystal-clear and high-fidelity sound reproduction. Its capabilities shine in applications like home theater systems and professional audio amplifiers. Moreover, the TDA7294 thrives in demanding thermal environments, proving its resilience and reliability for continuous operation across varied scenarios.