1. General description
The SAA7102; SAA7103 is used to encode PC graphics data at maximum 800 × 600
resolution to PAL (50 Hz) or NTSC (60 Hz) video signals. A programmable scaler and
interlacer ensures properly sized and flicker-free TV display as CVBS or S-video output.
Alternatively, the three Digital-to-Analog Converters (DACs) can output RGB signals
together with a TTL composite sync to feed SCART connectors.
When the scaler/interlacer is bypassed, a second VGA monitor can be connected to the
RGB outputs and separate H and V-syncs as well, thereby serving as an auxiliary monitor
at maximum 800 × 600 resolution/60 Hz (PIXCLK < 45 MHz).
The device includes a sync/clock generator and on-chip DACs.
2. Features
■ Digital PAL/NTSC encoder with integrated high quality scaler and anti-flicker filter for
TV output from a PC
■ 27 MHz crystal-stable subcarrier generation
■ Maximum graphics pixel clock 45 MHz at double edged clocking, synthesized on-chip
or from external source
■ Up to 800 × 600 graphics data at 60 Hz or 50 Hz with programmable underscan range.
■ Three Digital-to-Analog Converters (DACs) at 27 MHz sample rate for CVBS (BLUE,
C
B
), VBS (GREEN, CVBS) and C (RED, C
R
) (signals in parenthesis are optional); all at
10-bit resolution
■ Non-Interlaced (NI) C
B
-Y-C
R
or RGB input at maximum 4 : 4 : 4 sampling
■ Downscaling from 1 : 1 to 1 : 2 and up to 20 % upscaling
■ Optional interlaced C
B
-Y-C
R
input of Digital Versatile Disc (DVD) signals
■ Optional non-interlaced RGB output to drive second VGA monitor (bypass mode with
maximum 45 MHz)
■ 3 × 256 bytes RGB Look-Up Table (LUT)
■ Support for hardware cursor
■ Programmable border color of underscan area
■ On-chip 27 MHz crystal oscillator (3rd-harmonic or fundamental 27 MHz crystal)
■ Fast I
2
C-bus control port (400 kHz)
■ Encoder can be master or slave
■ Programmable horizontal and vertical input synchronization phase
■ Programmable horizontal sync output phase
■ Internal Color Bar Generator (CBG)
■ Optional support of various Vertical Blanking Interval (VBI) data insertion
SAA7102; SAA7103
Digital video encoder
Rev. 04 — 18 January 2006 Product data sheet
