BT481A
BT481A is 110 Mhz / 256 Word Color Palette / 24 Bit True Color Power Down RAMDAC manufactured by Brooktree.
atures
- 110 MHz Operation
- Supports 8:8:8:8, 24-bit true color and VGA overlay
- Supports 8:8:8 24-bit RGB/BGR selectable true-color format
- Supports 5:6:5 XGA true-color format
- Supports 5:5:5 TARGA true-color format
- Replaces Bt471/475/476/477/478 which are pin patible
- Power-on reset for internal registers
- Power-down mode
- Antisparkle circuitry
- Analog output conparators
- Triple 6-bit (8-bit) D/A converters
- 256 x 18 (24) color palette RAM
- 15 x 18 (24) overlay registers
- Optional internal voltage reference
- Programmable pedestal
- Sync on all three channels
- Standard MPU interface
- 44-pin PLCC package
Functional Block Diagram
VAA GND VREF IREF
1.2 V CLOCK P[7:0] SYNC- BLANK- OL0- OL3 SETUP TRUECOL- Latch 4 Overlay Mask Reg Pixel Read Mask Reg 6 (8) 256 x 18 (24) Color Palette 6 (8) 15 x 18 (24) Overlay Color Palette
Reference Amplifier OPA P
6 (8)
Applications
DAC IOB pare SENSE-
ADDR Reg 8
R 6 (8)
G 6 (8)
B 6...
