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參數(shù)資料
| 型號： | TVP3409-170 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Advanced Video Interface PALETTE(雙PLL，視頻接口調色器真彩色CMOS) |
| 中文描述： | 先進的視頻接口盒（雙鎖相環(huán)，視頻接口調色器真彩色的CMOS） |
| 文件頁數(shù)： | 32/57頁 |
| 文件大?。?/td> | 312K |
| 代理商： | TVP3409-170 |
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2–20
The WMA and RMA address registers increment following a blue read or write cycle. They are accessible
to the MPU and are used to address RAMDAC color RAM locations. The MPU can read the address register
at any time without modifying its contents or the existing read/write mode. The pixel clock must be active
for MPU accesses to the RAMDAC color RAM.
2.6.7
The SENSE output is a logic 0 when one or more of the red, green, or blue outputs have exceeded the
internal voltage reference level (340 mV). This output determines the presence of a CRT monitor, and, with
diagnostic code, the difference between a loaded or unloaded RGB line can be discerned. The 340 mV
reference has a 70 mV tolerance.
SENSE Output
2.6.8
The device gain from the voltage reference to the DAC output current is shown in Table 2–21. To set the
full-scale white current on the DACs while using an internal or external voltage reference, use the formula
in equation (2).
DAC Gain
I
O
(mA) = [V
ref
(V)
×
1000
×
K]/R
SET
(
)
(2)
Where:
V
ref
is the voltage reference in volts
K is the gain constant
R
SET
is the resistor connected between the RSET terminal and ground.
In this case, a voltage reference of 1.235 V with R
SET
= 147
and a K factor of 3.17 results in I
O
= 26.63 mA.
A 6-bit DAC with no blank (H) results in a K factor of 2.1 and I
O
= 17.64 mA.
The recommended R
SET
for RS-343A compatibility applications (doubly terminated 75
) is 147
. The
recommended R
SET
for PS/2
applications (50
) is 182
.
Table 2–21. Device Gain Factor (K)
BLANK
K (8-BIT)
L
K (6-BIT)
2.26
2.28
H
2.12
2.1
PS/2 is a trademark of International Business Machines Corporation.
相關PDF資料 |
PDF描述 |
|---|---|
| TVP3409-135 | Advanced Video Interface PALETTE(雙PLL，視頻接口調色器真彩色CMOS) |
| TVP3703-170 | Video Interface PALETTE Exract(雙PLL，先進的視頻接口調色器) |
| TVP3703-135 | Video Interface PALETTE Exract(雙PLL，先進的視頻接口調色器) |
| TVP3703FN | VIDEO INTERFACE PALETTE TRUE-COLOR CMOS RAMDAC |
| TVP5020TQFP | NTSC/PAL VIDEO DECODER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TVP3409-170CFN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TVP3409-170FN | 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) |
| TVP3703 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VIDEO INTERFACE PALETTE TRUE-COLOR CMOS RAMDAC |
| TVP3703-135CFN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TVP3703FN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VIDEO INTERFACE PALETTE TRUE-COLOR CMOS RAMDAC |
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