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)： 11/60頁(yè)
文件大小： 647K
代理商： BT457KG125
Bt457/Bt458
1.0 Circuit Description
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
1.2 Pin Descriptions
L45801 Rev. N
Conexant
1-3
1.2 Pin Descriptions
Table 1-1. Pin Descriptions
(1 of 2)
Pin Name
Description
BLANK*
Composite blank control input (TTL compatible). A logical 0 drives the analog outputs to the blanking level, as
specified in
Table 1-5
. BLANK* is latched on the rising edge of LD*. When BLANK* is a logical 0, the pixel and
overlay inputs are ignored.
SYNC*
Composite sync control input (TTL compatible). A logical 0 on this input switches off a 40 IRE current source on
the IOG output (see
Figure 1-4
). SYNC* does not override any other control or data input, as illustrated in
Table 1-5
; therefore, it should be asserted only during the blanking interval. It is latched on the rising edge of
LD*.
If sync information is not generated on the IOG output, this pin should be connected to GND.
LD*
Load control input (TTL compatible). The P[7:0] {A
–
E}, OL[1,0] {A
–
E}, BLANK*, and SYNC* inputs are latched on
the rising edge of LD*. While LD* is either one fourth or one fifth the CLOCK rate, it can be phase independent of
the CLOCK and CLOCK* inputs. LD* can have any duty cycle within the limits specified in the AC Characteristics
section.
P[7:0]
{A
–
E}
Pixel select inputs (TTL compatible). These inputs are used to specify, on a pixel basis, which of the 256 entries
in the color palette RAM is used to provide color information. Either 4 or 5 consecutive pixels (up to 8 bits per
pixel) are input through this port. They are latched on the rising edge of LD*. Unused inputs should be connected
to GND.
The {A} pixel is output first, followed by the {B} pixel, then the {C} pixel, etc., until all 4 or 5 pixels have been
output, at which point the cycle repeats.
OL[1,0]
{A
–
E}
Overlay select inputs (TTL compatible). These control inputs are latched on the rising edge of LD*. In conjunction
with bit 6 of the command register, they specify which palette is to be used for color information, as follows:
When accessing the overlay palette, the P[7:0] {A
–
E} inputs are ignored. Overlay information bits (up to 2 bits per
pixel) for either 4 or 5 consecutive pixels are input through this port. Unused inputs should be connected to GND.
IOR, IOG,
IOB, IOUT
Red, green, and blue video current outputs. These high-impedance current sources can directly drive a doubly
terminated 75
coaxial cable (see
Figure 3-2
). The Bt457 outputs IOUT rather than IOR, IOG, and IOB.
OL1
OL0
CR6 = 1
CR6 = 0
0
0
Color Palette RAM
Overlay Color 0
0
1
Overlay Color 1
Overlay Color 1
1
0
Overlay Color 2
Overlay Color 2
1
1
Overlay Color 3
Overlay Color 3
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