CS4954
CS4955
NTSC/PAL Digital Video Encoder
Features
Description
The CS4954/5 provides full conversion from digital video
Six DACs providing simultaneous
composite,S-video, and RGB or Component
formats YCbCr or YUV to NTSC and PAL Composite,
Y/C (S-video) and RGB, or YUV analog video. Input for-
YUV outputs
mats can be 27 MHz 8-bit YUV, 8-bit YCbCr, or ITU
Programmable DAC output currents for low
R.BT656 with support for EAV/SAV codes. Video output
impedance (37.5
Ω)
and high impedance
can be formatted to be compatible with NTSC-M, NTSC-
(150
Ω)
loads
J, PAL-B,D,G,H,I,M,N, and Combination N systems.
Closed Caption is supported in NTSC. Teletext is sup-
Multi-standard support for NTSC-M, NTSC-
ported for NTSC and PAL.
JAPAN, PAL (B, D, G, H, I, M, N,
Combination N)
Six 10-bit DACs provide two channels for an S-Video
output port, one or two composite video outputs, and
ITU R.BT656 input mode supporting
EAV/SAV codes and CCIR601 Master/Slave
three RGB or YUV outputs. Two-times oversampling re-
duces the output filter requirements and guarantees no
input modes
DAC-related modulation components within the speci-
Programmable HSYNC and VSYNC timing
fied bandwidth of any of the supported video standards.
Multistandard Teletext (Europe, NABTS,
Parallel or high-speed I²C compatible control interfaces are
WST) support
provided for flexibility in system design. The parallel interface
VBI encoding support
doubles as a general purpose I/O port when the CS4954/5 is
Wide-Screen Signaling (WSS) support, EIA-J
in I²C mode to help conserve valuable board area.
CPX1204
The CS4954 and CS4955 are available in a 48-pin TQFP
NTSC closed caption encoder with interrupt
and operate in -40 to +85°C ambient temperature. The
CDB4954/55 Customer Demonstration board is also
CS4955 supports Macrovision copy
available. Please refer to
protection Version 7
Host interface configurable
VAA
for parallel or I²C
®
compatible
CLK
Output
LPF
10-Bit
SCL
operation
I²C Interface
C
Interpolate
DAC
SDA
On-chip voltage reference
8
Control
10-Bit
Chroma Amplifier
Σ
PDAT[7:0]
CVBS
Registers
DAC
Host
generator
RD
Parallel
Chroma Modulate
WR
10-Bit
Interface
+3.3 V or +5 V operation,
Y
DAC
PADR
Burst Insert
CMOS, low-power modes,
XTAL_IN
10-Bit
Color Sub-carrier Synthesizer
R
XTAL_OUT
DAC
three-state DACs
Chroma Interpolate
TTXDAT
TTXRQ
8
VD[7:0]
HSYNC
VSYNC
FIELD
INT
RESET
Video Formatter
Video Timing
Generator
RGB
DGND
Teletext
Encoder
YCbCr to RBG
Color Space
Converter
U,V
LPF
10-Bit
DAC
10-Bit
DAC
Y Luma Interpolate
Voltage
Reference
Y
RGB
TEST
Current
Reference
VREF
ISET
G
B
Luma Amplifier
Y
Sync Insert
Copyright
©
Cirrus Logic, Inc. 2006
(All Rights Reserved)
www.cirrus.com
SEPTEMBER '06
DS278F6
1
CIRRUS [ CIRRUS LOGIC ]
