AK8859VQ

Overview

The AK8859VQ is a single-chip digital video decoder designed for composite and S-video signals. It decodes NTSC, PAL, and SECAM standards into YCbCr format compliant with ITU-R BT.601 and BT.656 interfaces. The device features two analog input channels processed by 10-bit ADCs operating at 27MHz. It includes adaptive automatic gain control, auto color control, and image adjustment capabilities. Control is managed via an I2C interface. The core supply voltage ranges from 1.70V to 2.00V, while the I/O supply supports 1.70V to 3.60V. It operates within a temperature range of -40°C to 105°C and is housed in a 48-pin LQFP package.

Feature Summary

• Decodes composite and S-video signals including NTSC-J, M, 4.43; PAL-B, D, G, H, I, N, Nc, M, 60; and SECAM standards.
• Integrates two 10-bit ADCs with digital PGA, adaptive AGC, and ACC for signal processing.
• Outputs data in ITU-R BT.601 (YCbCr, 4:2:2, 8bit) format via ITU-R BT.656 parallel interface.
• Supports closed caption, VBID (CGMS-A), WSS decoding, and Macrovision detection.

Applications

• Video surveillance systems
• Set-top boxes
• Digital video recorders

Procurement Notes

Verify that the component matches the specified 48-pin LQFP package and the -40°C to 105°C industrial temperature rating. Confirm the presence of the required 24.576 MHz crystal circuitry for proper clock generation. Ensure power supply rails align with the 1.70V-2.00V core and 1.70V-3.60V I/O requirements during integration.

Selection Notes

Select this decoder when handling standard definition composite or S-video inputs requiring direct digital output. It is suitable for designs needing integrated VBI decoding and Macrovision detection without external processors. Consider the dual-channel input capability if simultaneous signal processing is required.

Part Context

The AK8859VQ belongs to AKM's line of digital video decoders. It serves as a bridge between analog video sources and digital processing units. Its design focuses on reducing system complexity by integrating ADCs, synchronization separation, and VBI decoding into a single chip.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.

FAQ

What video standards does the AK8859VQ support?

It supports NTSC-J, M, 4.43; PAL-B, D, G, H, I, N, Nc, M, 60; and SECAM standards.

How is the device controlled?

The device is controlled via an I2C bus interface, allowing access to registers for configuration and status monitoring.

What is the output data format?

The output data is in YCbCr format, compliant with ITU-R BT.601 and ITU-R BT.656 standards, using 8-bit parallel data.