Cirrus Logic CS4955 - Manual

1
Copyright © Cirrus Logic, Inc. 2006
(All Rights Reserved)
www.cirrus.com
CS4954
CS4955
NTSC/PAL Digital Video Encoder
Features
z Six DACs providing simultaneous
composite,S-video, and RGB or Component
YUV outputs
z Programmable DAC output currents for low
impedance (37.5
Ω) and high impedance
(150 Ω) loads
z Multi-standard support for NTSC-M, NTSC-
JAPAN, PAL (B, D, G, H, I, M, N,
Combination N)
z ITU R.BT656 input mode supporting
EAV/SAV codes and CCIR601 Master/Slave
input modes
z Programmable HSYNC and VSYNC timing
z Multistandard Teletext (Europe, NABTS,
WST) support
z VBI encoding support
z Wide-Screen Signaling (WSS) support, EIA-J
CPX1204
z NTSC closed caption encoder with interrupt
z CS4955 supports Macrovision copy
protection Version 7
z Host interface configurable
for parallel or I²C
® compatible
operation
z On-chip voltage reference
generator
z +3.3 V or +5 V operation,
CMOS, low-power modes,
three-state DACs
Description
The CS4954/5 provides full conversion from digital video
formats YCbCr or YUV to NTSC and PAL Composite,
Y/C (S-video) and RGB, or YUV analog video. Input for-
mats can be 27 MHz 8-bit YUV, 8-bit YCbCr, or ITU
R.BT656 with support for EAV/SAV codes. Video output
can be formatted to be compatible with NTSC-M, NTSC-
J, PAL-B,D,G,H,I,M,N, and Combination N systems.
Closed Caption is supported in NTSC. Teletext is sup-
ported for NTSC and PAL.
Six 10-bit DACs provide two channels for an S-Video
output port, one or two composite video outputs, and
three RGB or YUV outputs. Two-times oversampling re-
duces the output filter requirements and guarantees no
DAC-related modulation components within the speci-
fied bandwidth of any of the supported video standards.
Parallel or high-speed I²C compatible control interfaces are
provided for flexibility in system design. The parallel interface
doubles as a general purpose I/O port when the CS4954/5 is
in I²C mode to help conserve valuable board area.
The CS4954 and CS4955 are available in a 48-pin TQFP
and operate in -40 to +85°C ambient temperature. The
CDB4954/55 Customer Demonstration board is also
available. Please refer to
“Ordering Information” on
page 2 .
SEPTEMBER '06
DS278F6
CLK
ISET
DGND
SCL
SDA
PDAT[7:0]
RD
WR
PADR
XTAL_OUT
VD[7:0]
HSYNC
VSYNC
FIELD
INT
RESET
I²C Interface
Host
Parallel
Interface
Color Sub-carrier Synthesizer
8
Video Formatter
Control
Registers
Chroma Modulate
Chroma Amplifier
Output
Interpolate
LPF
Burst Insert
Chroma Interpolate
LPF
Luma Interpolate
Luma Amplifier
Sync Insert
U,V
Y
Video Timing
Generator
TEST
Current
Reference
Voltage
Reference VREF
R DAC
Y DAC
CVBS
DAC
C
10-Bit
DAC
Σ
VAA
XTAL_IN
Teletext
Encoder
TTXRQ
TTXDAT
YCbCr to RBG
B DAC
G DAC
10-Bit
10-Bit
10-Bit
10-Bit
10-Bit
RGB RGB
Y Y
8
Color Space
Converter