SAF7115HW Просмотр технического описания (PDF) - NXP Semiconductors.

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SAF7115HW

Multistandard video decoder with super-adaptive comb filter, scaler and VBI data read-back via I2C-bus

NXP Semiconductors. 

SAF7115

Multistandard video decoder with super-adaptive comb filter,

scaler and VBI data read-back via I2C-bus

Rev. 01 — 15 October 2008

Product data sheet

1. General description

The SAF7115 is a video capture device that, due to its improved comb filter performance

and 10-bit video output capabilities, is suitable for various applications such as In-car

video reception, In-car entertainment or In-car navigation.

The SAF7115 is a combination of a two channel analog preprocessing circuit and a high

performance scaler.

The two channel analog preprocessing circuit includes source-selection, an anti-aliasing

filter and Analog-to-Digital Converter (ADC) per channel, an automatic clamp and gain

control, two Clock Generation Circuits (CGC1 and CGC2) and a digital multi standard

decoder that contains two-dimensional chrominance/luminance separation utilizing an

improved adaptive comb filter.

The high performance scaler has variable horizontal and vertical up and down scaling and

a brightness/contrast/saturation control circuit.

The decoder is based on the principle of line-locked clock decoding and is able to decode

the color of PAL, SECAM and NTSC signals into ITU-601 compatible color component

values. The SAF7115 accepts CVBS or S-video (Y/C) from TV or VCR sources as analog

inputs, including weak and distorted signals.

The expansion port (X-port) for digital video (bi-directional half duplex, D1 compatible) can

be used to either output unscaled video using 10-bit or 8-bit dithered resolution or to

connect to other external digital video sources for reuse of the SAF7115 scaler features.

The enhanced image port (I-port) of the SAF7115 supports 8-bit and 16-bit wide output

data with auxiliary reference data for interfacing, e.g. with VGA controller applications. It is

also possible to output video in square pixel formats accompanied by a square pixel clock

of the appropriate frequency.

The SAF7115 also incorporates provisions for capturing the serially coded data in the

Vertical Blanking Interval (VBI-data) of several standards in parallel. Three basic options

are available to transfer the VBI data to other devices:

• Capturing raw video samples, after interpolation to the required output data rate,

using the scaler and transferring the data to a device connected to the I-port

• Slicing the VBI data using the built-in VBI data slicer (data recovery unit) and

transferring the data to a device connected to the I-port

• Slicing the VBI data using the built-in VBI data slicer and reading out the sliced data

through the I2C-bus (for several slow VBI data type standards only)

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