AK4705VQ

Overview

The AK4705VQ is a 2-channel, 24-bit digital-to-analog converter (DAC) with an integrated AV SCART switch matrix. It utilizes a multi-bit architecture for its modulator to deliver wide dynamic range and improved THD+N performance. The device integrates switched capacitor filters (SCF) and continuous-time filters (CTF), eliminating the need for external high-cost filters. It supports sampling rates from 32kHz to 48kHz and includes stereo analog volume control with pop-noise-free circuits. The video section features CVBS/Y, R/C, and Y/Pb/Pr inputs/outputs with adjustable gain and loop-through modes.

Feature Summary

• Integrates a 64dB high-attenuation 8x FIR digital filter and second-order analog low-pass filter.
• Includes a comprehensive audio switch matrix supporting TV, VCR, and DAC routing with pop-noise-free mute functions.
• Features a video switch matrix with configurable RGB and composite outputs for SCART applications.
• Supports multiple serial data formats including I2S and MSB justified interfaces.

Applications

• Digital set-top-box systems
• AV receivers with SCART connectivity
• Video switching equipment

Procurement Notes

Verify the specific ordering suffix matches the required temperature range and package type. Confirm that the component is sourced from authorized channels to ensure authenticity. Check datasheet specifications for absolute maximum ratings before integration into power supply designs.

Selection Notes

Select this component for applications requiring integrated audio and video switching in a single package. Ensure the system design accommodates the 48-pin LQFP package dimensions. Verify compatibility with the required serial interface formats and clock frequencies for the target application.

Part Context

The AK4705VQ is part of the AK4705 series, designed primarily for digital set-top-box systems. It offers software compatibility with the AK4702 and AK4704 models but provides enhanced features such as 24-bit audio resolution and integrated video filtering capabilities.

Replacement Considerations

The AK4702 and AK4704 are software compatible alternatives within the same family. However, they lack certain features like the 64dB digital filter attenuation and specific video processing options found in the AK4705. Verify pinout and functional differences before substitution.

FAQ

What is the function of the DAPD bit?

The DAPD bit controls the DAC power-down mode. When set to '1', the internal DAC block is powered down, and the device switches to analog input mode using the DACL and DACR pins.

How does the Auto Startup Mode work?

In Auto Startup Mode, all blocks except the video detection circuit are powered down. Once a video signal is detected on the TVVIN or VCRVIN pin, the device automatically enters standby mode and sends a pulse via the INT pin.

What serial data formats are supported?

The AK4705 supports 16-bit LSB Justified, 18-bit LSB Justified, 24-bit MSB Justified, and I2S Compatible formats, selectable via the DIF0 and DIF1 bits.