
www.fairchildsemi.com
Features
 All-digital video encoding
 Internal digital oscillators, no crystals required
 Multiple input formats supported
– 24-bit and 15-bit GBR/RGB
– YC
B
C
R
422
or
444
– Color indexed
 30 overlay colors
(TMC22191)
 Fully programmable timing
 Supports input pixel rates of 10 to 15 Mpps
 256 x 8 x 3 color look-up tables
(bypassable on 
TMC22191)
 8-bit mask register
 8-bit composite digital video input
 Hardware and 24-bit data keying
 Synchronizes with TMC22071 Genlocking Video 
Digitizer
 8:8:8 video reconstruction
 SMPTE 170M NTSC or CCIR Report 624 PAL 
compatible
 Supports PAL-M and NTSC without pedestal
 Simultaneous S-VIDEO (Y/C) NTSC/PAL output
 10-bit D/A conversion (three channels)
 Controlled edge rates
 3 power-down modes
 Built-in color bars and modulated ramp test signals
 JTAG (IEEE Std 1149.1-1990) test interface
 Single +5V power supply
 84 lead PLCC package
 100 lead MQFP package
Description
The TMC22x91 digital video encoders convert digital com-
puter image or graphics data (in RGB, YCBCR, or color 
indexed format) or a CCIR-601 signal into a standard analog 
baseband television (NTSC or PAL) signal with a modulated 
color subcarrier.
Both composite (single lead) and S-VIDEO (separate 
chroma and luma) formats are active simultaneously at the 
three analog output pins, each of which generates a standard 
video-level signal into doubly-terminated 75
 load.
The TMC22x91 accepts digitized video from the companion 
TMC22071 Genlocking Video Digitizer. Soft switching 
between video sources is done under either hardware or 
programmable data control.
The TMC22191 offers 4-layer keying capability, bypassable 
CLUT, and 30 Overlay colors.
The TMC22x91 is fabricated in a submicron CMOS process 
and packaged in an 84 Lead Plastic Leadless Chip Carrier, or 
in a 100 Lead Metric Quad Flat Pack. Performance is guar-
anteed from 0
°
C to 70
°
C.
Logic Symbol
PD23-0
OL4-0
24
PDC
CHROMA
LUNA
COMPOSITE
F
I
G
I
M
I
V
O
VHSYNC
VVSYNC
GHSYNC
GVSYNC
CS
R/W
KEY
TDI
TMS
TCK
TDO
J
I
LDV
PXCK
C
V
REF
COMP
R
REF
A
I
BYPASS
RESET
D7-0
A1-0
27008A
TMC22x91
DIGITAL
VIDEO
ENCODER
CVBS7-0
8
8
2
6
BYPASS and OL4:0 on TMC22191 only.
T MC22091/T MC22191
Digital Video Enc oders/Layering Engine
Rev. 1.1.0