MAX7469

HDTV Continuously Variable Anti-Aliasing Filters

All Video Formats Supported and Optimization of Corner Frequency for Enhanced Video Quality and Noise Reduction

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Overview

Continuously Variable Anti-Aliasing Filter
- 5MHz to 34MHz in 256 Steps
Supports All Standard Video and Computer Input Formats
- 480i, 480p, 720p, 1080i
- QVGA, VGA, SVGA, XGA, SXGA, UXGA
- Y P_b P_r, G_sBR, RGBHV, Y/C, CVBS
Accepts Any Input Sync Format
- Sync on Y, Sync on G, External Sync (Positive or Negative)
- Sync on All Channels
Buffered Outputs Drive Standard 150Ω Video Load
- 0dB (MAX7469)
- +6dB (MAX7470)
DC- or AC-Coupled Outputs
Single +5V Analog and +3.3V Digital Supplies
5mW Power-Down Mode
20-Pin TQFN Lead-Free Package

The MAX7469/MAX7470 triple-channel, anti-aliasing filters and buffers are ideal for high-definition (HD) and standard-definition (SD) television (TV) applications. Compatible with 1080i, 720p, 480p, and 480i scanning system standards and computer format signals, the MAX7469/MAX7470 support component video (Y P_b P_r, G_sBR, and RGBHV), as well as composite (CVBS) and S-video (Y/C).

The MAX7469/MAX7470 limit the input bandwidth for anti-aliasing and out-of-band noise reduction prior to digital conversion by an ADC or video decoder. The MAX7469/MAX7470 frequency response can be continuously varied in 256 linear steps through an I²C interface from below SD resolution to beyond HD resolution.

The output buffers of the MAX7469/MAX7470 drive a 2V_P-P video signal into a standard 150Ω load. The inputs are AC-coupled, and the outputs can be either DC- or AC-coupled. The MAX7469 has a gain of 0dB, and the MAX7470 has a gain of +6dB. Both devices are available in a 20-pin TQFN package and are fully specified over the 0°C to +85°C upper-commercial temperature range.

Applications