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）
文件頁數(shù)： 18/60頁
文件大?。?/td> 647K
代理商： BT457KG125
1.0 Circuit Description
Bt457/Bt458
1.3 MPU Interface
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
1-10
Conexant
L45801 Rev. N
precision component ratios and greatly reduces the switching transients
associated with turning current sources on or off. Monotonicity and low glitch are
guaranteed by using identical current sources and current steering their outputs.
An on-chip operational amplifier stabilizes the D/A converter’s full-scale output
current against temperature and power supply variations.
Figure 1-4. Composite Video Output Waveforms
NO SYNC
SYNC
MA
V
MA
V
19.05
1.44
0.00
0.714
0.054
0.000
26.67
9.05
7.62
0.00
1.000
0.340
0.286
0.000
92.5 IRE
7.5 IRE
40 IRE
WHITE LEVEL
BLACK LEVEL
BLANK LEVEL
SYNC LEVEL
457-8_004
Table 1-5. Video Output Truth Table
Description
IOG (Iout)
(mA)
IOR, IOB
(mA)
Sync*
BLANK*
DAC Input Data
White
26.67
19.5
1
1
$FF
DATA
data + 9.05
data + 1.44
1
1
data
DATA - SYNC
data + 1.44
data + 1.44
0
1
data
BLACK
9.05
1.44
1
1
$00
BLACK-SYNC
1.44
1.44
0
1
$00
BLACK
7.62
0
1
0
$xx
SYNC
0
0
0
0
$xx
NOTE(S):
Typical with full-scale IOG = 26.67 mA. RSET = 523
and VREF = 1.235 V.
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