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SAA7115 View Datasheet(PDF) - Philips Electronics

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SAA7115 Datasheet PDF : 214 Pages
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Philips Semiconductors
CS-PD Hamburg
CVIP2
Datasheet
SAA7115
Date:
Version:
10/23/01
0.67
3 GENERAL DESCRIPTION
The SAA7115 is a video capture device for various applications ranging from small screen products like e.g. digital settop
boxes, personal video recording applications to big screen devices like e.g. LCD projectors due to it’s improved combfilter
performance and 10 bit video output capabilities.
The SAA7115 is a combination of a two channel analog preprocessing circuit including Source-Selection, Anti-Aliasing
Filter and A/D-converter, an Automatic Clamp and Gain Control, two Clock Generation Circuits (CGC1, CGC2), a Digital
Multi Standard Decoder containing two-dimensional chrominance/luminance separation by an improved adaptive comb
filter and a high performance scaler, including 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 colour of PAL, SECAM
and NTSC signals into ITU-601 compatible colour component values. The SAA7115 accepts as analog inputs CVBS or
S-Video (Y-C) from TV or VCR sources, including weak and distorted signals.
The expansion port (X-port) for digital video (bi-directional half duplex, D1 compatible) can be used either to output
unscaled video using 10 bit or 8 bit dithered resolution or to connect to other external digital video sources for reuse of
the SAA7115 scaler features.
The enhanced image port (I-port) of the 7115 supports 8 (16) bit wide output data with auxiliary reference data for
interfacing to e.g. VGA controllers, settop box applications etc. It is also possible to output video in Square Pixel formats
accompanied by a square pixel clock of the appropriate frequency.
In parallel SAA7115 incorporates also provisions for capturing the serially coded data in the vertical blanking interval
(VBI-data) of several standards. 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 build 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 build in VBI data slicer and reading out the sliced data via the I2C bus (for several slow
VBI data type standards only)
SAA7115 incorporates also a frame locked audio clock generation. This function ensures that there is always the same
number of audio samples associated with a frame, or a set of fields. This prevents the loss of sychronisation between
video and audio, during capture or playback. Furthermore the second analog onboard PLL optionally can be used to
enhance this audio clock to a low jitter frame locked audio clock.
The SAA7115 is controlled via I2C-bus (full write / read capability for all programming registers, bit rate up to 400 kbits/s)
Confidential - NDA required
Filename: SAA7115_Datasheet.fm
page 10
Last edited by H. Lambers
 

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