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參數(shù)資料
| 型號： | THS8133CPHP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.005 us SETTLING TIME, 10-BIT DAC, PQFP48 |
| 封裝： | PLASTIC, HTQFP-48 |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 549K |
| 代理商： | THS8133CPHP |
THS8133, THS8133A, THS8133B
TRIPLE 10BIT, 80 MSPS VIDEO D/A CONVERTER
WITH TRILEVEL SYNC GENERATION
SLVS204C APRIL 1999 REVISED SEPTEMBER 2000
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
APPLICATION INFORMATION
comparison to EIA RS-343/RS-170 levels
Traditionally, video amplitude levels are specified according to the EIA RS-343 or RS-170 standards. RS-343
uses a bi-level negative going sync. Also, there is a difference between the reference blanking and black video
level. Figure 15 shows the relative amplitudes and the current drives that would be needed to generate
compliant relative amplitudes with a double-terminated 75-
load, as is specified for RS-343. RS-170 compliant
levels can be reached using the same current sources but a different 150-
source termination resistor, which
brings the load to 150 || 75
= 50 . In this case a blank-to-white level of approximately 1 V is reached
(0.714 V
× 50 ÷ 37.5) as required by RS-170.
7.5 IRE
40 IRE
92.5 IRE
BLACK Level
BLANK Level
SYNC Level
With Sync Insertion
Without Sync Insertion
V
mA
V
mA
1.000
26.67
0.714
19.05
0.340
9.05
0.340
1.44
0.286
7.62
0
Figure 15. RS-343 Video Definition
The video signal contains 140 IRE, equal to 1 Vpp. This is split into 40 IRE for the composite sync, 7.5 IRE for
blanking-to-black and 92.5 IRE for the active video portion.
designing with PowerPAD
The THS8133 is housed in a high-performance, thermally enhanced, 48-pin PowerPAD
package (TI package
designator: 48PHP). Use of the PowerPAD
package does not require any special considerations except to
note that the PowerPAD
which is an exposed die pad on the bottom of the device, is a metallic thermal and
electrical conductor. Therefore, if not implementing the PowerPAD
PCB features, solder masks (or other
assembly techniques) may be required to prevent any inadvertent shorting by the exposed PowerPAD
of
connection etches or vias under the package. The recommended option, however, is not to run any etches or
signal vias under the device, but to have only a grounded thermal land as explained below. Although the actual
size of the exposed die pad may vary, the minimum size required for the keepout area for the 48-pin PHP
PowerPAD
package is 7 mm × 7 mm.
It is recommended that there be a thermal land, which is an area of solder-tinned-copper, underneath the
PowerPAD
package. The thermal land will vary in size, depending on the PowerPAD package being used,
the PCB construction, and the amount of heat that needs to be removed. In addition, the thermal land may or
may not contain numerous thermal vias, depending on PCB construction.
More information on this package and other requirements for using thermal lands and thermal vias are detailed
in the TI application note PowerPAD
Thermally Enhanced Package Application Report, TI literature number
SLMA002, available via the TI Web pages beginning at URL: http://www.ti.com.
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| THS8134BCPHP | PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, PQFP48 |
| THS8134CPHP | PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, PQFP48 |
| THS8134ACPHP | PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, PQFP48 |
| THS8135-240IPHP | PARALLEL, WORD INPUT LOADING, 10-BIT DAC, PQFP48 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS8133TQFP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 10-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION |
| THS8134 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION |
| THS8134A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION |
| THS8134ACPHP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION |
| THS8134ATQFP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION |
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