Overview
The TDA7718C, produced by STMicroelectronics, is a high-performance audio signal processor specifically designed for car radio and audio systems. This integrated circuit features a comprehensive set of audio processing functions, including input multiplexing, loudness control, volume control, bass control, and mute functions. The device is built with a Soft Step architecture, allowing for smooth and precise control over various audio parameters. It also includes advanced features such as offset detection for power amplifier failure diagnosis and digital control via the I2C bus.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit | |
|---|---|---|---|---|---|
| Supply Voltage (Vs) | - | 7.5 | 8.5 | 10 | V |
| Supply Current (Is) | - | 23 | 29 | 35 | mA |
| Input Resistance (Rin) - Single Ended | 70 | 100 | 130 | kΩ | |
| Input Resistance (Rin) - Differential | 70 | 100 | - | kΩ | |
| Common Mode Rejection Ratio (CMRR) | 44 | 60 | - | dB | |
| Loudness Max Attenuation (AMAX) | - | 14 | 15 | 16 | dB |
| Volume Max Gain (GMAX) | - | 22 | 23 | 24 | dB |
| Bass Center Frequency (Fc) | 60 | 80 | 100 | 200 | Hz |
| Bass Quality Factor (QBASS) | 1.0 | 1.25 | 1.5 | 2.0 | - |
| Output Noise (eNO) - A-weighted | - | 12 | 22 | - | µV |
| Signal to Noise Ratio (S/N) | 98 | 104 | - | dB |
Key Features
- Input Multiplexer: Supports multiple input configurations including quasi-differential and single-ended inputs.
- Loudness Control: Programmable center frequency (400 Hz, 800 Hz, 2400 Hz) with 15 dB attenuation and high frequency boost.
- Volume Control: +23 dB to -31 dB with 1 dB step resolution and soft-step control.
- Bass Control: Programmable center frequency (60 Hz, 80 Hz, 100 Hz, 200 Hz) with adjustable Q factor and DC gain.
- Mute Functions: Direct mute and digitally controlled SoftMute with programmable mute times.
- Offset Detection: Offset voltage detection circuit for power amplifier failure diagnosis.
- Digital Control: I2C bus interface for configuring various audio parameters.
Applications
The TDA7718C is primarily designed for use in car audio systems, providing advanced audio processing capabilities. It is suitable for a wide range of automotive audio applications, including car radios, amplifiers, and sound systems that require precise control over audio parameters.
Q & A
- What is the primary function of the TDA7718C?
The TDA7718C is a high-performance audio signal processor designed for car audio systems.
- What types of input configurations does the TDA7718C support?
The device supports quasi-differential and single-ended input configurations.
- What are the programmable center frequencies for the loudness control?
The loudness control has programmable center frequencies of 400 Hz, 800 Hz, and 2400 Hz.
- What is the range of the volume control?
The volume control ranges from +23 dB to -31 dB with 1 dB step resolution.
- What are the programmable center frequencies for the bass control?
The bass control has programmable center frequencies of 60 Hz, 80 Hz, 100 Hz, and 200 Hz.
- What is the purpose of the offset detection circuit?
The offset detection circuit is used for power amplifier failure diagnosis.
- How is the TDA7718C controlled?
The device is controlled via the I2C bus interface.
- What is the typical supply current of the TDA7718C?
The typical supply current is 29 mA.
- What is the signal to noise ratio (S/N) of the TDA7718C?
The signal to noise ratio is 98 dB to 104 dB.
- What are the main applications of the TDA7718C?
The main applications are in car audio systems, including car radios and amplifiers.
