www.cadeka.com
TMC2490A
Multistandard Digital Video Encoder
Features
• All-digital video encoding
• Internal digital subcarrier synthesizer
• 8-bit parallel CCIR-601/CCIR-656/ANSI/SMPTE
125M input format
• CCIR-624/SMPTE-170M compliant output
• Switchable chrominance bandwidth
• Switchable pedestal with gain compensation
• Pre-programmed horizontal and vertical timing
• 13.5 Mpps pixel rate
• Master or slave (CCIR656) operation
• MPEG interface
• Internal interpolation filters simplify output
reconstruction filters
• 10-bit D/A converters for video reconstruction
• Supports NTSC and PAL standards
• Closed-caption waveform insertion
• Simultaneous S-Video (Y/C) output
• Controlled edge rates
• Single +5V power supply
• 44 lead PLCC package
• Parallel and serial control interface
Applications
• Set-top digital cable television receivers
• Set-top digital satellite television receivers
• Studio parallel CCIR-601 to analog conversion
Description
The TMC2490A video encoder converts digital component
video (in 8-bit parallel CCIR-601/656 or ANSI/SMPTE
125M format) into a standard analog baseband television
(NTSC, NTSC-EIA, and all PAL standards) signal with a
modulated color subcarrier. Both composite (single lead) and
S-Video (separate chroma and luma) formats are active
simultaneously at all three analog outputs. Each video output
generates a standard video signal capable of driving a singly-
or doubly-terminated 75 Ohm load.
The TMC2490A is intended for all non-Macrovision
encoder applications.
The TMC2490A is fabricated in a submicron CMOS
process and is packaged in a 44-lead PLCC. Performance is
guaranteed over the full 0
°
C to 70
°
C operating temperature
range.
Block Diagram
LPF
B-Y
PD
7-0
PIXEL DATA
DEMUX AND
SYNC
EXTRACT
PXCK
Y
HSYNC
VSYNC, B/T
SELC
PDC/CBSEL
DIGITAL
SYNC AND
BLANK
GENERATOR
INTER-
POLATION
FILTER
REF
SERIAL/PARALLEL CONTROL
GLOBAL
CONTROL
V
REF
C
BYP
R
REF
65-2490(1)A-01
INTERPOLATOR
4:2:2 TO 4:4:4
R-Y
LPF
CHROMA
MODULATOR
INTER-
POLATION
FILTER
10-BIT
D/A
CHROMA
S-VIDEO
LUMA
COMPOSITE
SUBCARRIER
SYNTHESIZER
10-BIT
D/A
10-BIT
D/A
SERIAL
PARALLEL
SA
1
SA
0
ADR
SDA
R/W
SCL
CS
D
7-0
D
7-0
SER
RESET
REV. 1.0.2 2/27/02
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
