
www.fairchildsemi.com
Features
Mixes 24//16-bit GBR/YC
color-index sources
24//16-bit GBR/YC
255-step proportional mixing via
256-step mixing with
256 x 8-bit look-up table on
Lap-dissolve and fade effects
a
and crosspoint controls for soft and color-border wipe
generation
Mask register and three 256 x 8 bypassable CLUTs with
overlay on A-channel
Analog preview output with sync on Green/Y
D/A power-down modes
Single +5 volt power supply operation
Pin compatible with TMC22080 Digital Mixer
B
C
R
444//YC
B
C
R
422 and 8-bit
B
C
R
444//YC
B
C
a
R
7-0
422 output
inputs
=100h unity gain
channel
a
8-0
for
a
a
Applications
Mixing computer graphics and live video
Lap-dissolve between video sources
Fade to black or to user-selectable fill color
Window/wipe processing
Description
The TMC2081 is a Digital Video Mixer that performs
M
= (
a
)
V
1
+ ( 1-
a
)
V
2
(for 0
£
a
£
1)
cross-fading at speeds faster than 40 Mpps proportionally
controlled by a 9-bit
a
-channel input. Variable rate dissolves
and fades may be implementedwith unity gain at the
points. With the
a
-Look-Up Table (
controlled by a single bit of the
a microprocessor interface.
a
end-
a
LUT), mixing may be
-channel input. Setup is via
a
Supported video formats are 24-bit GBR, YC
16-bit YC
B
C
R
422 component video. Dissimilar pixel for-
mats may be mixed using on-chip interpolation and decima-
tion filters and GBR/YC
B
C
R
and YC
conversion matrices.
B
C
R
444, and
B
C
R
/GBR color-space
An additional format accepted by the A-channel is 8-bit
color-indexed pixel data which addresses three bypassable
256 x 8 color look-up tables (CLUTs). A 15 color overlay
palette and a 24-bit fill register are also included.
Digital and Analog outputs may be programmed to view
either mixer inputs, V
1
or V
2
or mixer output, M.
Packaged in a 128-lead plastic metric quad flat-pack
(MQFP), the TMC2081 is fabricated with a sub-micron
CMOS process. Performance is guaranteed over the com-
mercial, 0
°
C to 70
°
C temperature range.
T MC2081
Digital Video Mixer
Rev. 1.3.0
Logic Symbol
PDA23-0
PDB23-0
OL3-0
SMX2-0
M23-0
PASS14
D7-0
D2-0
CS
R/W
SYNC
BLANK
AV
D
I
V
O
A
O
D
S
T
I
O
&
A
T
M
P
I
PASSEN
SIG0
a
8-0
65-2081-01
CLK
TMC2081
DIGITAL
VIDEO
MIXER
SIG14
AVOUT
G/Y
B/CB
R/CR
COMP
VREF
RREF