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CS4952
NTSC/PAL Digital Video Encoder
The following information is based on the technical datasheet: CS4952 DS223PP2 OCT `97 Please contact Cirrus Logic : Crystal Semiconductor Products Division for further information.
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Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
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CS4952
Features
NTSC/PAL Digital Video Encoder
Features
q Simultaneous composite and S-video output q Supports RS170A and CCIR601 composite output timing q Multi-standard support for NTSC-M, PAL (B, D, G, H, I, M,
N, Combination N)
q Optional progressive scan @ MPEG2 field rates q CCIR656 input mode supporting EAV/SAV codes and
CCIR601 Master/Slave input modes
q Stable color subcarrier for MPEG2 systems q NTSC closed caption encoder with interrupt q Supports Macrovision copy protection in CS4953 version q Host interface configurable for parallel or I2C compatible
operation
q General purpose input and output pins q Individual DAC power-down capability q On-chip voltage reference generator q On-chip color bar generator q +5 volt only, CMOS, low power modes, tri-state DACs
Description
The CS4952/3 provides full conversion from YCbCr or YUV digital video formats into NTSC & PAL Composite and Y/C (S-video) analog video. Input formats can be 27 MHz 8-bit YUV, 8-bit YCbCr, or CCIR656 with support for
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CS4952
Description
EAV/SAV codes. Output video can be formatted to be compatible with NTSCM, or PAL B,D,G,H,I,M,N, and Combination N systems. Also supported is NTSC line 21 and line 284 closed captioning encoding. Four 9-bit DACs provide two channels for an S-Video output port and two composite video outputs. 2x oversampling reduces the output filter requirements and guarantees no DAC related modulation components within the specified 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 CS4952/3 is in I2C mode to help conserve valuable board area.
VAA CLK SCL SDA PDAT[7:0] RD* WR* 8 Host Parallel Interface
I 2C Interface
Control Registers
Output Interpolate
LPF
9-Bit DAC 9-Bit DAC 9-Bit DAC
C
Chroma Amplifier Chroma Modulate Burst Insert
Chroma Interpolate
CVBS37
CVBS75
ADDR XTAL
Color Sub-carrier Synthesizer
9-Bit DAC
Y
VD[7:0]
8
Video Formatter
U, V Y
LPF
Luma Delay
Luma Amplifier
HSYNC* VSYNC* FIELD INT RESET*
Sync Insert Video Timing Generator Output Interpolate GND LPF
Voltage Reference Current Reference TEST
VREFIN VREFOUT
ISET
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CS4952
Overview Overview
The CS4952/3 is a complete multi-standard digital video encoder implemented in current 5-volt only CMOS technology. CCIR601 or CCIR656 compliant digital video input can be converted into NTSC-M, PAL B, PAL D, PAL G, PAL H, PAL I, PAL M, PAL N, or PAL N Argentina-compatible analog video. The CS4952/3 is designed to connect to MPEG1 and MPEG2 digital video decompressors without glue logic. Two 9-bit DAC outputs provide high quality S-Video analog output while two other 9-bit DACs simultaneously generate composite analog video. The CS4952/3 will accept 8-bit YCbCr or 8-bit YUV input data. The CS4952/3 is completely configured and controlled via an 8-bit host interface port or an I2C compatible serial interface. This host port provides access and control of all CS4952/3 options and features like closed caption insertion, interrupts, etc. In order to lower the end user set-top overall system costs, the CS4952/3 provides an internal voltage reference which eliminates the requirement for an external discrete 3-pin voltage reference.
FAQs
1) A: How to bring the CS4952 in standby mode? In order to bring the part in standby mode, you have to power down all the DACs (through register settings) and then turn off the clock. The total current consumption is then 2 mA, which gives a total power consumption of 10 mW. The CS4952 retains its previous configuration. It does not need to be reprogrammed. What is the difference between powering down DACs and disabling DACs? When the DACs are disabled, there is no current flow from the output, but there is still a current flow through the DAC. For a low power operation, the DACs can be shut down via the power down registers. In this mode, turn-on through the control register will not be instantaneous.
2) A:
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CS4952
Ordering Information
3) A: How to get the best performance out of the CS4952? Three points should be considered to achieve the best performance possible: Layout, clock, ISET. Proper mixed-signal layout techniques should be used, such as, short supply traces, low ESR decoupling capacities, and split analog and digital power and ground. Care should be taken to have the best possible 27 MHz clock. It should be free of jitter as much as possible, because color burst accuracy and stability are limited by the 27 MHz clock. The ISET resistor determines the DAC output current per bit. The selection of that resistor is important to get good DAC performance. It should not vary over temperature and should be precise. Typically a metal film resistor with 1% accuracy should be used.
Ordering Information
CS4952/3-CL CS4952/3-CQ 44 pin PLCC 44 pin TQFP
For further information on Crystal products, please visit our website "www.crystal.com" or call our literature department (800) 888-5016 ext. 3594 or (512) 912-3594 for data sheets and application notes.
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Sales Office and Applications Support
UNITED STATES Sales Office and Applications Support: WESTERN AREA Cirrus Logic Crystal Semiconductor Div. 50 Airport Pkwy. San Jose, CA 95110 Ph: 408-437-7743 FAX: 408-437-4943
Cirrus Logic Crystal Semiconductor Div. 6 Venture, Ste. 100 Irvine, CA 92718 Ph: 714-453-5910 FAX: 714-453-5914
EUROPE Sales Office and Applications Support:
Cirrus Logic France Immeuble Andre Malraux 93561 Rosny s/s Bois CEDEX, France Ph: +33(148)122812 FAX: +33(148)122810 Cirrus Logic Crystal Semiconductor (UK) Ltd. Spectrum Point, 279 Farnborough Rd., Farnborough, Hampshire GU14 7LS, United Kingdom Ph: +44(0)1252372762 FAX: +44(0)1252372763 Cirrus Logic GmbH Muehlfelder-Strasse 2 D-82211 Herrsching, Germany Ph: +49(08152)92460 FAX: +49(08152)924699
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CENTRAL AREA Cirrus Logic Crystal Semiconductor Div. 14205 Burnet Rd., Ste. 400 Austin, TX 78728 Ph: 512-255-8893 FAX: 512-255-0733 EASTERN AREA Cirrus Logic Crystal Semiconductor Div. 5511 Capital Center Dr., Ste. 103 Raleigh, NC 27606 Ph: 919-859-5393 FAX: 919-859-5334
Cirrus Logic 10 New England Business Center, Ste. 100 Andover, MA 01810 Ph: 978-794-9138 FAX: 978-794-9998 Cirrus Logic Crystal Semiconductor Div. 10440 Little Patuxent Pkwy., Ste. 300 Columbia, MD 21044-3559 Ph: 410-740-5654 FAX: 410-740-6961
JAPAN FAR EAST Sales Office and Applications Support: CHINA Cirrus Logic International Ltd. A-1403, Qiancun Commercial Mansion Beijing, China 100029 Ph: (8610)6443-0783 Ph: (8610)6443-0784 Ph: (8610)6443-0785 FAX: (8610)6443-0786 HONG KONG Cirrus Logic International Ltd. 1203 Park Tower 15 Austin Rd., Tsimshatsui Kowloon, Hong Kong Ph: (852)2376-0801 FAX: (852)2375-1202 Sales Office and Applications Support: Cirrus Logic K.K. Shinjuku Green Tower, Bldg. 26F 6-14-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, 160 Japan Ph: +81(03)3340-9111 FAX: +81(03)3340-9120
CRYSTAL SEMICONDUCTOR PRODUCTS DIVISION PO BOX 17847 4210 S. INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 / 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.crystal.com

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