YCrCb or RGB to NTSC/PAL
Digital Video Encoder
The Bt856/7 is designed specifically for video systems requiring the generation of
525-line (NTSC/PAL–M) or 625-line (PAL–B, D, G, H, I, N, N-Argentina) compos-
ite or Y/C (S-video) signals.
The Bt856 and Bt857 are functionally identical, with the exception that Bt857
can output the Macrovision anticopy algorithm.
Horizontal sync (HSYNC*) and vertical sync (VSYNC*) may be configured as
inputs (slave mode) or outputs (master mode). BLANK* is an input and may be
externally controlled.
24-bit linear or gamma-corrected RGB data or 4:2:2 YCrCb data may be input.
The rise and fall times of sync, the burst envelope, and closed caption data are inter-
nally controlled.
Analog luminance (Y) and chrominance (C) information is available on the Y and
C outputs for interfacing to S-video equipment. The composite analog video signal
is output simultaneously onto two analog outputs. This allows one output to provide
baseband composite video and another output to drive an RF modulator. Analog
RGB is available to support the European SCART/PeriTV interface.
Bt856
Bt857
Distinguishing Features
• RGB or YCrCb Inputs, Selectable on a
Pixel-by-Pixel Basis
• NTSC/PAL/PAL–M/PAL–N (Argentina)
Composite Video Output
• S-Video/RGB Outputs Supported
• CCIR 601 or Square Pixel Operation
• 2x Oversampling
• 9-bit DACs
• Master or Slave Video Timing
• Noninterlaced Operation
• Macrovision Support (Bt857 Only)
• Closed Captioning Encoding
• Power-Down Mode
• SCART Support (RGB Outputs)
• I
2
C Interface
• On-Board Voltage Reference
• Internal Color Bar Generator
• 68-pin PLCC Package
Functional Block Diagram
IIC DATA
IIC CLOCK
VREF_OUT
VREF_IN
FSADJUST
Related Products
COMP
CLKX2
CLKX1
R[0:7]
G[0:7]
B[0:7]
Latch
HSYNC*
VSYNC*
BLANK*
Color
Space
Convert
GAMMA
Correct
Internal
VREF
9
DAC
• Bt819
• Bt851
• Bt856EVM
CVBS/B
Applications
•
•
•
•
•
Digital Set Top Box
Direct Broadcast Satellite (DBS)
Digital Video Disk (DVD)
Digital VCR
VideoCD
9
2x
Upscaling
Mod.
and
Mixer
DAC
CVBS/G
9
DAC
Y/CVBS
1.3 MHz
LPF
9
DAC
C/R
FIELD
SLAVE
RESET* PAL INTERLACE SQUARE GAMMA* YCMODE
SLEEP RGBOUT
Brooktree
®
Brooktree Corporation • 9868 Scranton Road • San Diego, CA 92121-3707 • 619-452-7580
1-800-2-BT-APPS • FAX: 619-452-1249 • Internet: apps@brooktree.com • L856001 Rev. C
Ordering Information
Model Number
Bt856KPJ
Bt857KPJ
Package
68-Pin Plastic J-Lead
68-Pin Plastic J-Lead
Ambient Temperature Range
0˚ to +70˚C
0˚ to +70˚C
Copyright © 1994, 1995 Brooktree Corporation. All rights reserved.
Print date: 07/21/95
Brooktree reserves the right to make changes to its products or specifications to improve performance, reliability, or
manufacturability. Information furnished by Brooktree Corporation is believed to be accurate and reliable. However, no
responsibility is assumed by Brooktree Corporation for its use; nor for any infringement of patents or other rights of third parties
which may result from its use. No license is granted by its implication or otherwise under any patent or patent rights of Brooktree
Corporation.
Brooktree products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a
Brooktree product can reasonably be expected to result in personal injury or death. Brooktree customers using or selling Brooktree
products for use in such applications do so at their own risk and agree to fully indemnify Brooktree for any damages resulting from
such improper use or sale.
Brooktree is a registered trademark of Brooktree Corporation. Product names or services listed in this publication are for
identification purposes only, and may be trademarks or registered trademarks of their respective companies.
Specifications are subject to change without notice.
PRINTED IN THE UNITED STATES OF AMERICA
T
ABLE OF
C
ONTENTS
List of Figures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v
List of Tables
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Circuit Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin Descriptions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Clock Timing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pixel Input Timing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
24-bit RGB Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16-bit YCrCb Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-bit YCrCb Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CBFLAG Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slave Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIELD Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pixel Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burst Blanking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chrominance Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Subcarrier Phasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Blanking Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noninterlaced Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
6
6
6
Video Timing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
11
11
11
12
12
12
12
12
14
14
15
15
Pixel Input Ranges and Colorspace Conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
RGB Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
YC Inputs (4:2:2 YCrCb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
DAC Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Brooktree
®
iii
T
ABLE OF
C
ONTENTS
Bt856/7
Closed Captioning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Anticopy Process (Bt857 Only)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Internal Color Bars
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SCART/PeriTV Support
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Software Programming
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Outputs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Luminance or CVBS (Y/CVBS) Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chrominance or Red (C/R) Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Composite Video or Blue (CVBS/B) Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Composite Video (CVBS/G) Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
21
21
Registers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Internal Register
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
PC Board Considerations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Component Placement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Power and Ground Planes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Decoupling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Device Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMP Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VREF _IN Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
36
36
36
Signal Interconnect
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Digital Signal Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Analog Signal Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Applications Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
ESD and Latchup Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sync and Burst Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clock and Subcarrier Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filtering RF Modulator Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38
38
39
40
I
2
C Programming
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Data Transfer on the I
2
C Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Parametric Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
DC Electrical Parameters
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
DC Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
AC Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Package Drawing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Revision History
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
iv
Brooktree
®
Bt856/7
L
IST OF
F
IGURES
List of Figures
Figure 1.
Figure 2.
Figure 3.
Figure 4a.
Bt856/7 Pinout Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detailed Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interlaced 525-Line (NTSC, PAL-M) Video Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interlaced 625-Line (PAL–B, D, G, H, I, N, N-Argentina) Video Timing . . . . . . . . . . . . . . .
4
5
7
8
Figure 4b. Interlaced 625-Line (PAL–B, D, G, H, I, N, N-Argentina) Video Timing . . . . . . . . . . . . . . . 9
Figure 5. Noninterlaced 262-Line (NTSC, PAL-M) Video Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Noninterlaced 312-Line (PAL–B, D, G, H, I, N, N-Argentina) Video Timing . . . . . . . . . . . 10
Figure 7.
Figure 8.
Figure 9.
Three-Stage Chroma Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Luminance Upsampling Filter Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
525-Line (NTSC/PAL–M) Y (Luminance) Video Output Waveform . . . . . . . . . . . . . . . . . 22
Figure 10. 625-Line (PAL–B, D, G, H, I, N, N-Argentina)
Y (Luminance) Video Output Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 11. 525-Line (NTSC/PAL–M) C (Chrominance) Video Output Waveform . . . . . . . . . . . . . . .
Figure 12. 625-Line (PAL–B, D, G, H, I, N, N-Argentina)
C (Chrominance) Video Output Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 13. Composite 525-Line (NTSC/PAL–M) Video Output Waveform . . . . . . . . . . . . . . . . . . . .
Figure 14. Composite 625-Line (PAL–B, D, G, H, I, N, N-Argentina) Video Output Waveform . . . .
Figure 15. Typical Connection Diagram and Parts List (External Voltage Reference) . . . . . . . . . . .
Figure 16. Typical Connection Diagram and Parts List (Internal Voltage Reference) . . . . . . . . . . . .
Figure 17. IIC Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 18. 24-bit RGB and 16-bit YCrCb Video Input and Output Timing . . . . . . . . . . . . . . . . . . . . .
Figure 19. 8-bit YCrCb Video Input and Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 20. 68-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
25
26
27
34
35
41
46
47
48
Brooktree
®
v
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