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PDF BT856 Data sheet ( Hoja de datos )

Número de pieza BT856
Descripción (BT856 / BT857) YCrCb or RGB to NTSC/PAL Digital Video Encoder
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Bt856
YCrCb or RGB to NTSC/PAL
Digital Video Encoder
Bt857
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.
Functional Block Diagram
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)
• I2C Interface
• On-Board Voltage Reference
• Internal Color Bar Generator
• 68-pin PLCC Package
IIC DATA
IIC CLOCK VREF_OUT
VREF_IN FSADJUST
CLKX2
CLKX1
R[0:7]
G[0:7]
B[0:7]
HSYNC*
VSYNC*
BLANK*
FIELD
SLAVE
Latch
Internal
VREF
GAMMA
Correct
Color
Space
Convert
1.3 MHz
LPF
2x
Upscaling
9
DAC
9
DAC
Mod.
and
Mixer 9
DAC
9
DAC
COMP
CVBS/B
CVBS/G
Y/CVBS
C/R
Related Products
• Bt819
• Bt851
• Bt856EVM
Applications
• Digital Set Top Box
• Direct Broadcast Satellite (DBS)
• Digital Video Disk (DVD)
• Digital VCR
• VideoCD
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: [email protected] • L856001 Rev. C

1 page




BT856 pdf
Bt856/7
LIST OF FIGURES
List of Figures
Figure 1. Bt856/7 Pinout Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. Detailed Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Interlaced 525-Line (NTSC, PAL-M) Video Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4a. Interlaced 625-Line (PAL–B, D, G, H, I, N, N-Argentina) Video Timing . . . . . . . . . . . . . . . 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. Three-Stage Chroma Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8. Luminance Upsampling Filter Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 9. 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 . . . . . . . . . . . . . . . 24
Figure 12. 625-Line (PAL–B, D, G, H, I, N, N-Argentina)
C (Chrominance) Video Output Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 13. Composite 525-Line (NTSC/PAL–M) Video Output Waveform . . . . . . . . . . . . . . . . . . . . 26
Figure 14. Composite 625-Line (PAL–B, D, G, H, I, N, N-Argentina) Video Output Waveform . . . . 27
Figure 15. Typical Connection Diagram and Parts List (External Voltage Reference) . . . . . . . . . . . 34
Figure 16. Typical Connection Diagram and Parts List (Internal Voltage Reference) . . . . . . . . . . . . 35
Figure 17. IIC Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 18. 24-bit RGB and 16-bit YCrCb Video Input and Output Timing . . . . . . . . . . . . . . . . . . . . . 46
Figure 19. 8-bit YCrCb Video Input and Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 20. 68-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Brooktree®
v

5 Page





BT856 arduino
Bt856/7
CIRCUIT DESCRIPTION
Pin Descriptions
A detailed block diagram of the Bt856/7 is shown in Figure 2.
Figure 2. Detailed Block Diagram
Brooktree®
5

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