BT856 Datasheet, PDF (1/54 Pages) List of Unclassifed Manufacturers – YCrCb or RGB to NTSC/PAL Digital Video Encoder

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: [phone] • Internet: [e-mail] • L856001 Rev. C