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參數(shù)資料
型號(hào)： BT457KG125
英文描述： Video DAC with Color Palette (RAMDAC)
中文描述： 視頻DAC的調(diào)色板（的RAMDAC）
文件頁(yè)數(shù)： 1/60頁(yè)
文件大小： 647K
代理商： BT457KG125
Data Sheet
L45801 Rev. N
September 2, 1999
Bt457/Bt458
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette
RAMDAC
The Bt457 and Bt458 are pin- and software-compatible RAMDACs designed specifically
for high-performance, high-resolution color graphics. The architecture enables a display
of 1280 x 1024 bit-mapped color graphics (up to 8 bits per pixel plus up to 2 bits of
overlay information). This minimizes the use of costly ECL interfacing, because most of
the high-speed (pixel clock) logic is contained on-chip. The multiple pixel ports and
internal multiplexing enable TTL-compatible interface (up to 32 MHz) to the frame
buffer, while maintaining the 165 MHz video data rates required for sophisticated color
graphics.
The Bt457 is a single-channel version of the Bt458 and has a 256 x 8 color lookup
table with a single 8-bit video D/A converter. It includes a PLL output to enable subpixel
synchronization of multiple Bt457s.
On-chip features include programmable blink rates, bit plane masking and blinking,
color overlay capability, and a dual-port color palette RAM.
Functional Block Diagram
CLOCK*
CLOCK
VAA
GND
FSADJUST
VREF
LD*
P[7:0]
(A-E)
OL[1,0]
(A-E)
SYNC*
BLANK*
CLOCK
40
10
40
10
40
10
8
2
8
2
4(8)
4(8)
4(8)
COMP
IOR (N/C)
IOG (IOUT)
IOB (PLL)
4(8)
8
D[7:0]
CE* R/W CO
C1
Load
Control
MUX
Control
Blink
Control
Latch
Latch
MUX
Read
Mask
Blink
Mask
256 X 12
(24)
Color
Palette
4 x 12
(24)
Overlay
Bus Control
ADDR Reg
R
G
B
4
Distinguishing Features
165, 135, 125, 110, 80 MHz
operation
4:1 or 5:1 input mux
256-word dual-port color palette
Four dual-port overlay registers
RS-343A-compatible outputs
Bit plane read and blink masks
Standard MPU interface
84-pin PLCC or PGA package
+5 V CMOS monolithic
construction
Applications
High-resolution color graphics
CAE/CAD/CAM
Image processing
Video reconstruction
相關(guān)PDF資料
PDF描述
BT457KG80 Video DAC with Color Palette (RAMDAC)
BT457KPJ110 Video DAC with Color Palette (RAMDAC)
BT457KPJ125 Video DAC with Color Palette (RAMDAC)
BT457KPJ80 Video DAC with Color Palette (RAMDAC)
BT8472EPF Protocol Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BT457KG80 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
BT457KPJ110 制造商:BROOKTREE 功能描述:
BT457KPJ125 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
BT457KPJ135 制造商:BROOKTREE 功能描述: 制造商:Brooktree 功能描述:Digital Analog Converter, Single, 8 Bit, 84 Pin, PLCC 制造商:Brooktree (BT) 功能描述:Digital Analog Converter, Single, 8 Bit, 84 Pin, PLCC 制造商:BT 功能描述:Digital Analog Converter, Single, 8 Bit, 84 Pin, PLCC
BT457KPJ80 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
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